US20080010378A1 - Collaborative File Update System - Google Patents
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- US20080010378A1 US20080010378A1 US11/833,503 US83350307A US2008010378A1 US 20080010378 A1 US20080010378 A1 US 20080010378A1 US 83350307 A US83350307 A US 83350307A US 2008010378 A1 US2008010378 A1 US 2008010378A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/10—Office automation; Time management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99951—File or database maintenance
- Y10S707/99952—Coherency, e.g. same view to multiple users
- Y10S707/99953—Recoverability
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99951—File or database maintenance
- Y10S707/99952—Coherency, e.g. same view to multiple users
- Y10S707/99954—Version management
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Abstract
Description
- This application claims the benefit of co-pending U.S. provisional application Ser. No. 60/______ entitled “Collaborative File Update System” and filed Jul. 10, 2003, incorporated herein by reference.
- Colleagues in workgroups increasingly rely on electronic messaging to exchange and collaborate on electronic files. With the increased use of the Internet to connect remote participants in workgroups, colleagues often find themselves unable to reach a common point at which they can safely and conveniently store and access shared files. Even where such access is possible (e.g., within a local area network or via an Internet-based virtual private network), workgroup participants often gravitate to the convenience and familiar interface of electronic mail and wind up passing files back and forth as electronic mail (e-mail) attachments.
- Collaborative access to electronic files via e-mail attachments can be inefficient for a number of reasons. Transmission of files as attachments consumes significant network resources. This problem is worsened due to the inefficient base-64 encoding that e-mail systems conventionally employ. Recipients of electronic mail messages with large attachments may become annoyed at lengthy download times when checking their e-mail, particularly when connecting over slower telephone lines. Many users would prefer to access shared files when and if they wish, rather than having files “pushed” into their e-mail in-boxes.
- In a collaborative workgroup, managing access and version control of shared files can pose an even more significant problem for simple attachment-based file sharing. After sending a version of a file to a colleague via e-mail attachment, a file originator or author loses control of edits made to that version by the colleague. Implementing such edits in the “official” version of the file requires the file originator to overwrite the original file with an edited version sent back to the originator via another e-mail attachment. Implementing edits made by multiple colleagues requires the originator to merge edits manually.
- PCT Patent application No. WO 00/60503 by Serbinis et al. discloses a document-management system in which a file originator uploads a file to a document management system store and lists users authorized to access the document. Nonetheless, there remains a need to more seamlessly integrate document management with e-mail systems, to promote convenience and to help discourage users from falling back on the familiar but inefficient system of sending files by attachment. Better e-mail/document integration would provide the convenience and familiar interface of sending files as attachments while maintaining the benefits of network access to shared files.
- In a method according to various aspects of the present invention for facilitating collaborative updating of a file, data is accepted from one of a plurality of users and stored. The data represents an initial version of the file and designates one or more recipients of the initial version.
- Then, for each one of a plurality of sequentially updated versions of the file, data is accepted from one of the plurality of users. The data is representative of a difference between the updated version of the file and an immediately previous version of the file. The data also designates one or more recipients of the updated version. Data representative of the updated version of the file is transmitted to the designated recipients of the updated version.
- According to a particular aspect of the invention, a server accessible to all the users accepts the data. Advantageously, the users can exchange references to file revisions which, when activated by a designated recipient, cause the server to transmit data representative of an original or updated version of the file, thus avoiding the need for file transfer directly between the users.
- The data transmitted to each recipient designated as a recipient of the updated version and having accessed the immediately previous version consists substantially of the difference between the updated version of the file and the previous version of the file. Thus, users who are capable of obtaining an updated file version merely by patching an immediately previous version with a delta file receive only that delta file. The entire file as updated need not be transmitted in such cases.
- According to another particular aspect of the invention, users designated as recipients of the updated version but not the immediately previous version receive data of the updated file itself rather than a delta from any previous version. The file is updated before transmission, and the complexity of transmitting multiple deltas for updating after transmission is avoided.
- The above summary does not include an exhaustive list of all aspects of the present invention. Indeed, the inventors contemplate that the invention includes all systems and methods that can be practiced from all suitable combinations of the various aspects summarized above, as well as those disclosed in the detailed description below and particularly pointed out in the claims filed with the application. Such combinations have particular advantages not specifically recited in the above summary.
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FIG. 1 is a schematic block diagram of an electronic file access system according to various aspects of the present invention. -
FIG. 2 is a data flow diagram of a method for transmitting file data in the system ofFIG. 1 . -
FIG. 3 is a data flow diagram of a method for accessing data transmitted by the method ofFIG. 2 . -
FIGS. 4 and 5 depict two exemplary electronic message windows according to various aspects of the invention. -
FIG. 6 , including two partial views labeledFIG. 6A andFIG. 6B , depicts a propagated signal embodied in a message-encoded data stream according to various aspects of the invention. -
FIG. 7 is a functional flow diagram of processing performed to maintain file modifications using byte differencing according to various aspects of the invention. -
FIG. 8 is a functional flow diagram of processing performed to maintain file modifications using block differencing according to various aspects of the invention. -
FIG. 9 is a data flow diagram illustrating operation of a collaborative file update system according to various aspects of the invention. -
FIGS. 10-19 are schematic block diagrams illustrating a collaborative file update system according to various aspects of the invention at various states depicted inFIG. 9 . -
FIGS. 20-21 are schematic block diagrams of hierarchical directory structures used as addressable data segments of local storage according to various aspects of the invention. - An electronic mail file access system according to various aspects of the present invention provides numerous benefits, including convenience of access management arising from the use of novel extensions to the familiar user interface employed by typical e-mail software. Such a system suitably includes any group of hardware or software components that can interact to facilitate file access via electronic messaging. For example,
system 100 ofFIG. 1 includes afirst computer 110, a second computer 140, and a third “access server”computer 170, suitably networked together viaconventional network connections -
FIG. 1 schematically depictscomputers system 100 as schematic symbols within each respective computer's dashed box. These functional modules can be suitably implemented by hardware, software, or both. Functional modules can interact via any suitable routes of interconnection, including hardware (e.g., a bus, dedicated signal lines, etc.), access to shared storage media (e.g., arguments and returned values of function calls in RAM media, dual-access RAM, files residing on hard disk media, etc.), and combinations of hardware and shared media access. -
Computer 110 implements functional modules including I/O (input/output)module 112,storage 114, and ane-mail client application 116 modified by a plug-in 118.Control module 120 manages operation of these modules and any others thatcomputer 110 implements. Hardware andsoftware interconnection module 122 represents interconnection between the various modules ofcomputer 110. - Computer 140 implements functional modules including I/
O 142,storage 144, ane-mail client application 146 and a directfile access module 148.Control module 150 manages operation of these modules and any others that computer 140 implements. Interconnection between the various modules of computer 140 is represented by hardware and software interconnection module 152. - Access
server 170 implements functional modules to provide network access to files in astorage module 174.Server 170 includes, in addition tostorage 174, a network filetransfer interface module 172 and acontrol module 176.Interconnection module 178 represents hardware and software interconnection between the various modules ofcomputer 170. - An I/O functional module according to various aspects of the invention includes any hardware or software that accepts input from a user and conveys output to the user. In
system 100, the user ofcomputer 110 is aperson 102 acting as a file manager, and the user of computer 140 is aperson 198 acting as a file accessor. I/O module 112 ofcomputer 110 accepts conventional user input (e.g., mouse and keyboard input, voice dictation and commands) fromfile manager 102, who directs operation ofcomputer 110. I/O module 112 conveys output fromcomputer 110 tofile manager 102 via conventional output devices (e.g., an LCD or CRT monitor, speakers) not shown inFIG. 1 . Similarly, I/O module 142 of computer 140 accepts input from, and conveys output to, fileaccessor 198. Although computer users appear as humans at the computers, the invention allows for persons not present at the computers at all times, or “present” only through remote links. Also, the person can be replaced with artificial intelligence systems or robots. -
Exemplary storage modules computers 110 and 140 andaccess server 170 conventionally include hard disk storage, RAM, and boot ROM. A storage functional module according to various aspects of the invention can include, in addition to the hardware and software employed inmodules -
Control modules computers 110 and 140 andaccess server 170 conventionally include one or more central processing unit (CPU) integrated circuits with embedded microcode, boot software (e.g., in a BIOS chip), and a suitable software operating system, e.g., Linux, BeOS, MacOS, WINDOWS, etc. (A control module according to various aspects of the invention can include this exemplary hardware and software or any other that controls operation of a computer.) Once the software operating system takes control of the CPU, it manages interaction of other components in the CPU's computer. For example,control module 120 manages the exchange of data between I/O module 112, a hard disk and memory instorage module 114, and application function calls implementinge-mail client module 116 and plug-inmodule 118, the exchange being represented by hardware andsoftware interconnection module 122. - An e-mail client module according to various aspects of the invention includes any functional module implemented by any suitable hardware and software combination that permits a user to exchange electronic messages with another user via a network connection. When suitably modified for purposes of implementing aspects of the invention by plug-in
module 118, exemplarye-mail client module 116 can be a conventional e-mail client application and still perform functions (discussed below) insystem 100. Suitable e-mail client applications include NOTES (Lotus/IBM), EUDORA (Qualcomm), MESSENGER (Netscape), and OUTLOOK (Microsoft). Alternatively, such function can be integrated intoapplication module 116, in which case plug-inmodule 118 may be omitted. -
E-mail client module 146 of computer 140 need not be specially coded or modified by a plug-in module to perform its functions insystem 100. Exemplary computer 140 includes direct file access module 148 (preferably launched as an e-mail attachment) to perform such functions. In variations where the benefits of a direct file access module are not required, a file accessor can just employ a conventional e-mail client. In such variations, direct file access can be initiated by selection of a hyper-link embedded in an e-mail message, avoiding the need for a direct file access module. In other variations, a file accessor can employ a specially coded electronic mail client or one modified by a plug-in. Accordingly, a system according to various aspects of the invention can operate without retrofitting all e-mail software for file accessors. - Code residing within a single dynamic-linked library (DLL) file can implement plug-in
module 118, at least within the EUDORA e-mail client in variations employing that client. An installation program can store the DLL file in a “plugins” folder (e.g., “C:\Program Files\Eudora\plugins”) on a hard disk ofstorage module 114. Other e-mail clients implement plug-ins in different ways. - An
exemplary method 200 for message and file transmission insystem 100 may be better understood with additional reference to the data flow diagram ofFIG. 2 . This example illustrates benefits of various aspects of the invention when such aspects are employed in the exemplary configuration ofsystem 100. However, certain aspects can provide benefits even when various other aspects are omitted. Thus, neither this nor any other example provided herein should be considered as limiting the scope of the invention in any way; that limiting function is reserved exclusively for the issued claims. - In
process 210 ofmethod 200, the file manager (not shown inFIG. 2 ) prepares a message authorizing file access. To do so,file manager 102 interacts withcomputer 110 via input and output communicated through I/O module 112. (SeeFIG. 1 .) The file manager identifies a file 222 (resident on a hard disk or other media ofstorage 114 ofFIG. 1 ) to which he or she wishes to authorize access by a file accessor. The file manager typically is the author of files to which he or she grants access, though this need not be the case. - The file manager identifies an
electronic message address 226 of the file accessor. With functional modifications from plug-inmodule 118, module 116 (FIG. 1 ) further records indicia of whetherfile accessor 198 is a viewer authorized to view the file or an editor authorized to modify the file. (Naturally, authorization to modify a file implies concurrent authorization to view it.) - In conventional electronic mail systems, an electronic message address includes a user's ID followed by the “@” symbol, which is followed by a network domain name of the user. For example, the address “tom_edison@lightbulbs.com” includes the user ID “tom_edison” and the domain name “lightbulbs.com”. Given a compatible infrastructure, other types of electronic message addresses can be employed.
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Method 200 continues withprocess 230, which determines authorization status of the file accessor. Process 230 (whichcomputer 110,access server computer 170, or perhaps computer 140 ofFIG. 1 can execute), relies onauthorization data 228 to make this determination.Authorization data 228 can be automatically determined or the file manager can supply it manually. Exemplary systems and methods for manual determination of authorization data are discussed below with reference toFIGS. 4-5 . - Authorization data for a given file accessor can be automatically determined based on the electronic message address associated with the file accessor, using any suitable technique. In
system 100 ofFIG. 1 , for example, an authorization database module (not shown, but which may be located on storage 114) incomputer 110 maintains a database of authorized accessors and authorization status for each. The authorization database module can look up the address offile accessor 198 and, if a match is found, update authorization data 228 (FIG. 2 ) to identifyaccessor 198 as a viewer or editor with direct access authorization or as an accessor with no direct access authorization. - In addition or alternatively,
system 100 can automatically determine authorization data based on the user ID or domain name offile accessor 198. For example, all addresses having the same corporate domain name as the address offile manager 102 may be associated with data authorizing direct file access. As another example, all addresses having the domain name of commonly known free e-mail services may be associated, out of security concerns, with data that blocks authorization of direct file access. In a variation where both automatic and manual authorization determination are employed in combination, such blocking can be assigned a higher priority to override any user authorization. - Exemplary method 200 (
FIG. 2 ) continues with eitherprocess 250 orprocesses process 230. Ifaccessor address 226 is not authorized for direct access to file 222,process 250 conventionally transmits a copy offile 222 as an attachment tomessage 224. Ifaddress 226 is authorized for direct file access, however,process 242 creates a reference to file 222.Process 244 then transmitsmessage 222 to the file accessor with the reference attached tomessage 222 or integrated into it.Process 246 then transmits data offile 222 to accessserver 170 via network connection 17 (seeFIG. 1 ). - In variations of system 100 (
FIG. 1 ),computer 110 can send file references instead of file attachments when direct file access is requested.Computer 110 can do so even with an entirely unmodified e-mail client module or one that is only modified to include viewer and editor fields. In such variations,computer 110 can implement an additional module (not shown) that detects API calls for attachment of a file to an e-mail message. If direct file access is requested, such a module can tricke-mail client module 116 into instead attaching a file of executable code that references the desired file. Alternatively,computer 110 can implement a firewall-type module (also not shown) that detects the presence of a file attachment in a message, just before transmission via network connection 14. The firewall-type module can replace file attachments with file references and transmit data of the formerly attached file to accessserver 170 vianetwork connection 17. - In
system 100 andmethod 200 ofFIGS. 1-2 ,access server 170 receives data offile 222 through networkfile transfer interface 172.Server 170 stores the data instorage 174, from which fileaccessor 198 can eventually obtain it to view oredit file 222, depending on his or her level of authorization. In variations where the benefits of an access server according to various aspects of the invention are not required, it can be omitted. In such a variation ofsystem 100, as an example, computer 140 can connect tocomputer 110 via network connection 14 for direct file access, omittingserver 170. - A file reference according to various aspects of the invention includes any indicia identifying a location of a file. A file reference can be a hyperlink. In that case, it includes both human-readable indicia (e.g., a file name) and associated machine-readable indicia (e.g., a network address from which the file can be retrieved). In one variation, a file reference can consist of just text identifying a network address, which a file accessor can enter into a suitable field (e.g., an address field of a Web browser) to retrieve the file.
- In a particularly advantageous variation, a file reference can be a message attachment that includes code implementing a direct file access module, e.g.,
module 148 ofsystem 100. A direct file access module according to various aspects of the invention includes any functional module implemented by any suitable hardware and software combination that facilitates direct file access. Advantageously, sending code to a file accessor that implements a direct file access module dispenses with the need for direct file access capability in that person's e-mail client. U.S. Pat. No. 6,014,688 to Venkatraman et al. contains disclosure that may be helpful in implementing this variation. - A file reference can include data representing a plausibly unique identification code that is associated with the referenced file, as well as other codes. A plausibly unique identification code according to various aspects of the invention is a sequence of digits, of any type and generated by any suitable technique, that (1) is associated with a specific document, document revision, server, user, or other identifiable entity and (2) is unlikely, to a desired degree of statistical certainty, to be associated with any other such entity.
- For example, a file reference can include four plausibly unique identification codes, each associated with, respectively, (1) an access server on which the referenced file resides, (2) the referenced file itself, (3) the transmitting user, and (4) the file's present revision. Advantageously, a recipient of such a file reference can access the file from a specifically identified access server in a multiple-server system without needing to poll multiple servers or infer which of several servers might be housing the desired file. In a variation where this and other benefits of a multiple-code file reference are not required, a single code identifying the file can be employed.
- The use of multiple access servers provides particular advantages. Where users are clustered geographically, for example, users within each of several widely separated clusters can be assigned an access server proximate that cluster. Each user is allowed to transmit files only the assigned access server and the recipient can either receive an identification of the access server with the file reference, as discussed above, or infer which of the several access servers houses the file by looking up the transmitting user in a roster of users and their permitted “write” servers. Multiple access servers can also be employed in a single location, allowing load distribution between several computers, and selected randomly or by some predetermined selection scheme.
- To enhance security by ensuring that only persons granted a specific level of authorization are able to exercise that authorization, a file reference is preferably encrypted or passed through a one-way cryptographic function. Encrypting the reference, either to a public key of a designated accessor or with a shared secret key known only to the accessor and the file manager, can prevent persons other than the designated accessor from using the file reference. Passing the file reference through a one-way cryptographic function (e.g., including a user ID, a file ID, and a time ID at the input) can prevent interlopers from discerning the name of the file based on its reference. Variations that do not encrypt the reference preferably employ alternative access control measures such as requiring a password or passphrase or only permitting SSL connections to authorized network addresses.
- U.S. patent applications Ser. No. 08/877,065, filed Jun. 17, 1997, and Ser. No. 09/092,132, filed Jun. 5, 1998, listed as priority documents in PCT application WO 98/58332 published Dec. 23, 1998, contain disclosure that may be helpful in enhancing security of file references.
- When operating in accordance with
method 200 ofFIG. 2 ,e-mail client module 116 in computer 110 (FIG. 1 ) transmitsmessage 224 toe-mail client module 146 in computer 140, under control offile manager 102. With direct file access authorization,file accessor 198 can then access file 222 (FIG. 2 ) separately frommessage 224.Accessor 198 offile 222 and any other authorized accessors can obtain and (if authorized as editors) modify data offile 222 viaaccess server 170. This regulated and usually bandwidth-intense file access occurs overnetwork connection 47, separately from network connection 14 betweencomputers 110 and 140. Thus, network connection 14 can be realized with a low-bandwidth and sporadic connection without affecting quality of access to file 222, once it has been stored inaccess server 170. - Any suitable connection equipment and communication protocols can be employed to implement
network connections system 100 employ multiple types of connections and protocols, especially whennetwork connections - In a particularly advantageous variation of
system 100,computer 110 can transmitelectronic message 224 to computer 140 under low-bandwidth or otherwise non-ideal conditions while deferring transmission offile 222 to accessserver 170. Such a system monitors the condition ofnetwork connection 17 and transmits file 222 whenconnection 17 improves to a suitable quality level. The quality level is preferably determined based on speed, but can also account for interruption frequency. - Deferral of file transmission can be analyzed by any suitable technique using any suitable standards. In an exemplary technique,
computer 110 determine conditions of that connection by analyzing packets sent across network connection 14 during transmission of a message sent to a file accessor. If the timing of the packet transmission indicates (by the predetermined standard) thatconnection 17 has unsuitable quality for transmission of a file “attached” by reference,computer 110 defers that transmission until conditions improve.Computer 110 can also periodically monitor conditions by analyzing packets sent during transmission of electronic messages other than the one to which the file is attached or during retrieval of Internet Web pages. One of many possible alternatives to this technique is forcomputer 110 to check for whether it has a local area network connection or a modem connection active and to defer file transmission until the local area network connection becomes active. Another alternative (based on transmission latency) is “pinging”access server 170 and determining transit times. - U.S. patent applications Ser. No. 60/065,533 filed Nov. 13, 1997; Ser. No. 60/085,427 filed May 14, 1998; and Ser. No. 60/100,962 filed Sep. 17, 1998, listed as priority documents in PCT application WO 99/26121 published May 27, 1999, contain disclosure that may be helpful in implementing deferred file transmission.
- An exemplary signal for transmission of an electronic message according to various aspects of the invention may be better understood with reference to
FIG. 6 . Propagatedsignal 600, which begins in the view ofFIG. 6A and ends in the view ofFIG. 6B , includes a series of data frames. Any suitable type of signal having a series of data frames (in parallel or serial format, in contiguous sequence or interspersed with unrelated data) can be employed. -
Frame 610, which includes subframes 612-618, includes miscellaneous message data that identifies the message and permits conventional systems to process it using an established message transmission protocol, e.g., MIME. - Frames 620-660 each include two subframes.
Subframes Subframes -
Frames Frames -
Frame 670, which includessubframes subframe 674 can includes actual data of the attachment. As depicted inFIG. 6B , however, message signal 600 includesdata 674 referencing the file. As discussed above, this reference data can include, for example, code that implements a direct file access module when executed or a hyperlink. - An
exemplary method 300 for file access insystem 100 may be better understood with reference toFIG. 3 . (Again, neither this nor any other provided example limits the invention.) Computer 140 ofFIG. 1 performsmethod 300 during operation of directfile access module 148. -
Method 300 begins (process 310 ofFIG. 3 ) with file accessor 198 (FIG. 1 ) viewing message 325 (FIG. 3 ) usinge-mail client module 146.Message 325 is a copy of data from message 222 (FIG. 2 ), received at computer 140 fromcomputer 110 via network connection 14 (FIG. 1 ).Message 325 also includes a reference to file 222 ofFIG. 2 . Inexemplary system 100 andmethods accessor 198 can execute to implement directfile access module 148. -
Method 300 continues (process 330 ofFIG. 3 ) with launching of directfile access module 148, which then carries outprocesses FIG. 3 depicts these latter processes inside a dashed box labeled with the reference number ofmodule 148.)Process 340 presents a user interface to the file accessor. This user interface can be as simple as a dialog box asking the user to confirm whether he or she wants to access a specified file.User interface process 340 can be omitted entirely if opening a single file automatically upon launch ofmodule 148 is acceptable. - A more complex and full-featured interface, for accessing multiple files or folders in accordance with various aspects of the invention, has the look and feel of the familiar file management interfaces provided in conventional operating systems. For example, the user interface can provide a view of multiple subfolders within a folder in which a file manager has authorized access to various files. With such an interface, a file accessor can easily select particular files that he or she wishes to view or modify (depending on the authorization level granted) without needing to retrieve data of other files.
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User interface process 340, as directed byfile accessor 198, cooperates withprocess 350 to obtain data of file 222 (FIG. 2 ) from access server 170 (FIG. 1 ). This process may be better understood with reference toFIG. 1 , as everything happening outside computer 140 is represented schematically inFIG. 3 bynetwork cloud 360. Duringprocess 350, directfile access module 148 of computer 140 communicates with networkfile transfer interface 172 ofaccess server 170, which retrievesfile 222 fromstorage 174 and transmits data offile 222 tomodule 148 vianetwork connection 47. -
Process 350 stores data offile 222 in a local data store 380 (seeFIG. 3 ), which computer 140 maintains withinstorage module 144.User interface process 340 can then transfer user interface focus to an editing or viewing process 390 (e.g., in a new user interface window).File accessor 198 can then view or modifyfile 222 using an appropriate software module. For example,accessor 198 can view or edit a text document with a word processor. - Access to file 222 in
exemplary method 300 occurs indirectly, via a cached copy of the file withinlocal data store 380. Advantageously, any modifications made to file 222 are first made to the cached copy and only later applied to the original file instorage 174 ofaccess server 170.Process 370 determines when updates to theoriginal file 222 are appropriate based on the state of the cached copy inlocal data store 380.Process 370 then communicates withserver 170, as schematically represented bynetwork cloud 360, and performs the updates accordingly. - The deferred file modification of
exemplary method 300 advantageously accesses the file locally, i.e., within computer 140, reducing the amount of network traffic required for extensive file viewing and modification. In addition, deferred modification can simplify version control of modifications to theoriginal file 222. As discussed below with reference toFIGS. 7-10 , files can be updated with editors' modifications using a block or byte differencing scheme. - An advantageous variation of a direct file access module according to various aspects of the invention includes a drive mapping user interface. Such an interface permits access to a folder or folders in
storage module 174 of server 170 (FIG. 1 ) much as if the folder contents were actually maintained within computer 140. -
Exemplary methods FIGS. 7-10 . As above, modifications to example file 222 (FIG. 2 ) are discussed in the context of exemplary system 100 (FIG. 1 ) andmethods 200 and 300 (FIGS. 2 and 3 ). -
FIG. 7 is a functional flow diagram of amethod 700 for maintainingfile 222 with byte differencing.Method 700 begins with two parallel steps.Decision step 710 determines whetherfile 222 has been directly accessed by (e.g., linked to) a file editor. Without depending on the result ofdecision step 710,step 720 creates a reference (e.g., a link) to data offile 222 ataccess server 170. - If a file editor has directly accessed
file 222 beforemethod 700 begins (or at least before the instance ofmethod 700 depicted inFIG. 7 ), processing proceeds to step 750, which retrieves the previous version offile 222.Process 760 then compares the previous version to the current (i.e., accessor-modified) version with a byte delta engine. A byte delta engine compares individual bytes of two files, using any suitable hardware and software, and produces indicia of differences between the individual bytes. Processing then proceeds to process 770, which creates a delta file including such indicia.Process 770 sends the delta file to accessserver 170 along with the reference created atprocess 720, as depicted bystorage process 730. (The delta file is preferably sent in a suitably encrypted and compressed form.) At concludingprocess 780 ofmethod 700, the previous version offile 222 is optionally deleted. - If a file editor has not directly accessed
file 222 beforemethod 700 begins,process 740 simply compresses file 222 (preferably encrypting it as well) and transmits it (e.g., using method 200) fromcomputer 110 offile manager 102 to accessserver 170. No person with authorization to modifyfile 222 has accessed it, and no differencing is necessary. -
FIG. 8 is a functional flow diagram of amethod 800 for maintainingfile 222 with block (instead of byte) differencing. Processing proceeds much as it does inmethod 700, in that processes 810, 820, 830, and 840 ofmethod 800 are analogous toprocesses method 700. However,process 850 retrieves block statistics of the previous version offile 222 rather than the file itself. The reason for this is that each block is a separate unit offile 222, and only blocks that change as a result of an editor's modification offile 222 need to be conveyed to accessserver 170. Any suitable type of statistic uniquely descriptive of data within a block, to a desired degree of statistical certainty, can be employed, for example an SHA-1 hash or 32-bit CRC. - Processing proceeds to step 855, which reads the modified (i.e., current) version of
file 222. Step 860 then compares statistics of the two versions' blocks, and step 870 creates a delta file of changed blocks with statistics for the modified file's blocks. Step 880 concludesmethod 800 by optionally deleting statistics for the previous version offile 222. -
Exemplary methods FIGS. 3, 7 , and 8 may be better understood in the context of a more specific example of direct file access, which refers tosystem 100,file manager 102, andfile accessor 198 ofFIG. 1 . That example may be better understood with reference to TABLE I, TABLE II, and TABLE III below. In the example,system 100 is configured as follows: (1)file accessor 198 has direct file access authorization for editing an example file; (2) the directly accessed file is decrypted and decompressed when opened or saved; (3)e-mail client module 146 is suitably modified to implement custom functions according to various aspects of the invention; and (4) computer 140 implements an additional module (not shown) of the type discussed above that replaces file attachments with file references. - TABLE I begins the description of the example by listing preferred sequences of steps when
file accessor 198 accesses a file.TABLE I Primary Event Actor ( FIG. 1 )Action Performed 1 Accessor 198Selects attachment with “DFA” extension (attached to e-mail message) provided by e-mail client 146. (“DFA” stands for“Direct File Access,” but suitable extension can be used.) 2 Computer 140 Upon selection of attachment with “DFA” extension, launches direct file access module 148 (here, software installed on computer 140), which presents dialog box with two options: “Open File” and “Save File” 3 Accessor 198Selects either option - the “DFA” extension is used for the attachment and is registered as an extension so as to activate direct file access module 148, which either:4(a) Computer 140 If “Open File” is selected, downloads the file to a temp or attachments folder, as is conventionally done when an attachment is opened from an e-mail message. 4(b) Computer 140 If “Save File” is selected, downloads the file to a location identified by accessor 198.5 Computer 140 While the file is being written to the temp or attachments folder (option a), or the accessor-identified folder (option b), it is also copied to a client database residing in storage 144. The filewritten there represents a file (revision) that was sent by manager 102. Once this file is stored in the client database, it isavailable for retrieval by accessor 198, ifaccessor 198 laterselects the “DFA” extension file attached to that message. The need to retrieve the file from access server 198 a second time is thus avoided. Copying the file to this client-side database also maintains the revision relationship between the e-mail message from manager 102 and the “DFA” file reference attachment.6 Computer 140 Records the location of the downloaded file as being in the temp or attachments folder for future reference. - TABLE II continues the description of the example by listing preferred sequences of steps when
file accessor 198 transmits file modifications back tofile manager 102.TABLE II Primary Event Actor ( FIG. 1 )Action Performed 1 Accessor 198Modifies the file. ( Accessor 198 is identified as an editor inthis example.) 2 Accessor 198Attaches file to e-mail message and sends message back to manager 102 and any other desired recipients.3 Computer 140 Removes the attached file before the message reaches network connection 14. 4 Computer 140 Recognizes the file based on data held in the client-side database in storage 144 and retrieves a copy of the earlierversion of the file from the database. 5 Computer 140 Compares the earlier and modified versions using a suitable selected differencing engine (byte or block) and creates a delta, i.e., a forward delta. 6 Computer 140 Writes delta into the client-side database and tags it there as a sequential delta to the original baseline file downloaded by accessor 198.7 Computer 140 Creates (or updates) delta file containing meta data about the difference, including: Original (baseline) file ID (ties to original message); Current Message Info; Message Originator; Message Recipient(s); Message Subject; Message Date; Current File Info; Modification Date; Modified Size; and Delta Size. 8 Computer 140 Sends delta file to access server 170 vianetwork connection 47. 9 Access Server 170Reads the meta data and stores the delta in a database in storage 174 such that it is retrievable fromserver 174 byfile manager 102 and any other specified recipients as: (1) a complete file, for recipients other than file manager 102 whohave not retrieved the file previously; or (2) a delta file. - TABLE III concludes the description of the example by listing preferred sequences of steps when
file manager 102 accesses the modified file.TABLE III Primary Event Actor ( FIG. 1 )Action Performed 1 Manager 102Selects attachment with “DFA” extension (attached to e-mail message) that was provided by client 116.2 Computer 110Upon selection of attachment with “DFA” extension, launches module (not shown in FIG. 1 ), which presentsdialog box with two options: “Open File” and “Save File” 3 Manager 102Selects either option - the “DFA” extension on the attachment activates direct file access module 148: 4 Computer 110Based on the delta file and the baseline version of originator 102, reconstructs a version of the file as modified by file accessor 198. 5(a) Computer 110If “Open File” is selected, downloads the reconstructed file to a temp or attachments folder, as is conventionally done when an attachment is opened from an e-mail message. 5(b) Computer 110If “Save File” is selected, downloads the reconstructed file to a location identified by manager 102.6 Computer 110While the reconstructed file is being written to the temp or attachments folder (option a), or the file manager-identified folder (option b), the delta file is copied to a client database residing in storage 114. The delta file written there representsa file (revision) that was sent by file accessor 198. Copyingthe delta file to this client-side database maintains the revision relationship between the e-mail message from accessor 198 and the delta file attachment.7 Computer 110Records the location of the downloaded file as being in the temp or attachments folder for future reference. - Exemplary systems and methods for manual determination of authorization data may be better understood with reference to
FIGS. 4 and 5 , which depict respectiveelectronic message windows Windows subject fields 440 and 540; and message text fields 450 and 550. In variations where the benefits of these fields are not required, some may be omitted. - In accordance with various aspects of the invention,
message windows - In
exemplary system 100 andmethod file accessor 198 can receivemessage 224 as a “TO:”, “CC:”, or “BCC:” message recipient in addition to receiving file access authorization. Other recipients ofmessage 224 need not be informed thataccessor 198 has received access authorization in addition tomessage 224, thoughmessage 224 can include publicly readable indicia to that effect if desired. -
Window 400 ofFIG. 4 includes afile viewer field 424 labeled “Viewer:” and a file editor field labeled “Editor:”. (The label text can be in uppercase or lowercase characters, in any words, e.g., in a foreign language, that are linguistic equivalents.)File manager 102 can designatefile accessor 198 as a viewer or editor by entering his or her electronic mail address inviewer field 424 oreditor field 426.File manager 102 can also designateaccessor 198 as a “TO:”, “CC:”, or “BCC:” message recipient by entering the address infields -
File manager 102 can replicate a file accessor address in a second field ofmessage window 400 by simply retyping the address or cutting and pasting. Advantageous variations ofe-mail client module 116 automatically replicate the address to a second field, which is referenced to the field in which the address was originally entered. Thusfile manager 102 is relieved of having to type the address twice. - In one such variation, selection of an entered address (e.g., by “right-clicking” on the address with a pointing device) causes a context menu to appear that allows quick designation of an additional field for that address. For example,
FIG. 4 depicts acontext menu 464 appearing on top ofwindow 400 as a result of right-clicking onaddress 462 to “charles@company.com”.Context menu 464 includes three menu items for replicating the address “charles@company.com” infields address 464 to “alice@company.com” causes a context menu (not shown) to appear with menu items “Viewer” and “Editor” for replicating the address infields FIG. 4 ,file manager 102 has entered “alice@company.com” into “BCC:”field 416 and replicated it to “Viewer:”field 424. - The text of addresses replicated elsewhere can function as hyperlinks. When selected with a pointing device, such text can transfer cursor focus to the referenced address or bring up a context menu (e.g., menu 464) when selected with a pointing device.
- Advantageously, manually entered and replicated addresses can appear differently in a message window according to various aspects of the invention. In
message window 400, for example, addresses not replicated (e.g., address 466 to “consultant@university.edu”) have a first appearance. Inwindow 400, the first appearance is just ordinary text. Addresses originally entered in a field and replicated in another (e.g., address 462) have a second appearance, which inwindow 400 is underlined text. Addresses replicated from another field (e.g.,address 468 in field 412) have a third appearance, which inwindow 400 is italicized text. The different appearances can also utilize different colors, in which case text having the second appearance can have the blue color commonly found in hyperlinks. - In other advantageous variations of
e-mail client module 116, file viewer and file editor fields can have different forms than the conventional “TO:”, “CC:”, or “BCC:” message recipient fields. For example,window 500 ofFIG. 5 includes, in addition to conventional message recipient fields 512-516, afile viewer field 524 and afile editor field 526. Inregion 520 ofexemplary message window 500,fields - Conventionally, radio button user interface elements are clustered in groups in which one and only one button is selected. To conform with this convention,
region 520 also includes a “no authorization”field 522 of radio buttons. When, for a given address, neither the corresponding “viewer” radio button offield 524 nor the “editor” radio button offield 526 is selected, the corresponding “no authorization” radio button offield 522 becomes selected. Thus, one radio button in each row, for each address, remains selected. - In
window 500, the number of rows in each offields region 520. Preferably, the state of a deleted row is retained after it is deleted (such as by using grayed text) so that it can be restored if the corresponding address is again recorded in one of fields 512-516. Insystem 100 andmethod 200, for example,file manager 102 may decide to remove “alice@company.com” from “CC:”field 514 and place that address instead in “BCC:”field 516. Iffile manager 102 identified the address as belonging to a viewer of the file “Widget Design Spec.rtf” when the address was recorded infield 514, he or she is likely to appreciate the convenience of having the same identification appear when the address is recorded infield 516. - In variations where both automatic and manual authorization determination are employed in combination, automatic determinations can produce default identifications of viewers and editors to enhance user convenience. If “bob@company.com” is determined to be an address belonging to an editor having editing privileges of the file “Widget Design Spec.rtf,” for example, that address can be automatically replicated to “Viewer:”
field 424 ofwindow 400 when entered infield region 520 ofwindow 500 with its corresponding radio button offield 526 automatically selected when entered infield - In further variations, automatic determinations of authorization can have a higher priority, overriding any manual identifications of addresses as viewers or editors. An override of manual identification can be visually indicated. For example, some radio buttons in
region 520 ofwindow 500 may be “grayed out.” Menu items that would otherwise identify an address as a viewer or editor inwindow 400 may be similarly grayed out. - The examples of
FIGS. 4 and 5 illustrate the convenience and simplicity of file access via electronic mail in accordance with various aspects of the invention. In both examples, a manager of the file “Widget Design Spec.rtf” grants three different types of access authorization to four different people with just a simple e-mail message. Two of the people (“Bob” and “Charles”), who are colleagues of the file manager within “Company,” are identified as editors having direct access authorization. They are thus able to modify the file, and the file manager instructs Bob and Charles to do so in the body of the message (fields 450 and 550). - Another person (“Alice”) within “Company” is also granted direct access authorization to the file, but only to view it. Alice may be a person in a different department that is only involved in a review capacity, or a person having lower seniority within the organization who is authorized only to comment on the file's contents.
- A fourth person (“Consultant”) at an outside institution “University” is not granted direct file access authorization. This may be due to a number of reasons. For example, the outside institution may not have a compatible network connection to an access server from which the file is directly accessed. As another example, the computer systems administrator for “Company” may have a policy prohibiting direct file access by persons outside the organization's local area network. “Consultant” receives her copy of the file as a conventional attachment to her copy of the message. (The other recipients of the message do not need to receive copies of the file as attachments because they can access the file directly.)
-
Windows - As discussed above with respect to
FIGS. 7-8 and TABLE II, a file can be transmitted differently depending on whether the recipient possesses the previous version of the file or not. If the recipient has retrieved an immediately previously version of the file, transmitting just a delta file (e.g., including only blocks or bytes changed from the previous version) is sufficient. The recipient's computer can store the delta with the previous version so that when the recipient opens the document the delta is available to patch the original and compile the version requested (not necessarily the latest version). If the recipient has not retrieved the previous version, the entire file is transmitted and stored on the recipient's computer. - In addition, when a user updates a file, the user's computer can transmit just a delta file if the entity to whom it is transmitting the update is known to possess an immediately previous version of the file. The user's computer can store the delta data locally along with the previous version where it can attach the previous version on demand to reconstruct the updated version, e.g., for transmission to another entity, repeated viewing, or further updating. Otherwise, the user's computer can transmit the file, as updated, in its entirety.
- A collaborative file update system according to various aspects of the invention efficiently transmits data representative of an updated version of a file to users who are designated as recipients of the file. Users designated as recipients of both the updated version and an immediately previous version of the file receive a delta file. The delta file consists substantially of data representing the difference between the updated version of the file and its previous version. Thus, users who are capable of obtaining an updated file version merely by patching an immediately previous version with a delta file receive only that delta file. The entire file as updated need not be transmitted in such cases.
- According to a particular aspect of the invention, users designated as recipients of the updated version but not the immediately previous version receive data of the updated file itself rather than a delta from any previous version. The file is updated before transmission, and the complexity of transmitting multiple deltas for updating after transmission is avoided.
- A collaborative file update system according to various aspects of the invention can include all the hardware and software (discussed above) of an electronic mail file access system of the invention. For example, such a system can advantageously transmit e-mail messages containing references to files rather than the files themselves, as discussed above with reference to
FIGS. 1-3 . The referenced files reside on an access server that is commonly accessible to both sender and recipient of the file. In variations of a collaborative file update system where the benefits of referenced file transmission are not required, the system can transmit files bodily as attachments instead. -
FIGS. 10-19 illustrate different states of a collaborative file update system, employed as part of an electronic mail file access system according to various aspects of the invention, during anexemplary method 900 illustrated inFIG. 9 . - A collaborative file update method of the invention, of which
method 900 is an example, manages transmission of a file's revisions among a plurality (in the example, four) of users “A” through “D,” none of whom are shown in the drawings.Exemplary method 900 includes various processes, which inFIG. 9 are grouped together according to the user's workstation (i.e., computer) on which they run. Processes 914-920 ofgroup 910 run on a computer 1020 (seeFIG. 10 ) of a first user A having alocal data store 912. Processes 934-938 run on acomputer 1030 of a second user B having alocal data store 932. Processes 954-956 run on a computer 1440 (seeFIG. 14 ) of a third user C having alocal data store 952. Process 974 runs on a computer 1630 (seeFIG. 16 ) of a fourth user D having alocal data store 972. - Each one of the illustrated processes of
method 900 accepts a reference to data of a file transmitted by one of the users, retrieves the referenced data from a commonlyaccessible server 990, and writes the data to its local data store.Processes server 990 and a reference to the file data to at least one of the users. -
FIGS. 10-19 illustrate hardware and data structures employed during processes 914-974 ofmethod 900 within dashed enclosures. Like numbers reference enclosures ofFIGS. 10-19 and associated processes ofFIG. 9 . -
Exemplary method 900 as illustrated inFIG. 9 begins withprocess 914, at which user A originates “rev 0” of a file. A method of the invention for managing transmission of file revisions can be a portion of a larger overall method, and thus “rev 0” ofmethod 900 can actually represent some revision of a file originated earlier in a method (not shown) that encompassesmethod 900. Similarly,method 900 does not modify the file beyond “rev 4” (atprocess 974, seeFIG. 18 ), but such an encompassing method can include processes (again, not shown) that can further modify the file. - Through process 914 (
FIG. 10 ), user A originates a file (or edits a file originated by earlier processes not shown), storing the file's data in afile data set 1024 on user A's computer 1020 (FIG. 10 ).Data set 1024 resides within anaddressable data segment 1022 of local storage oncomputer 1020.FIG. 9 schematically depicts local storage ofcomputer 1020 asdata store 912. - An addressable data segment of local storage on a computer according to various aspects of the invention includes any collection of data that can be suitably selected with a particular name or identification code. As discussed in greater detail below with reference to
FIG. 20 , for example, segment 1022 (FIG. 10 ) of local storage forcomputer 1020 is a hierarchical directory (i.e., folder) structure on a hard disk controlled bycomputer 1020.File data set 1024, which is a file residing in the last sub-directory ofsegment 1022, stores a file's initial version (as generated or received locally) and delta data for reconstructing the file to a current revision.Data set 1024 is a standard filesystem file, i.e., a collection of characters addressable by filesystem path and file names. Other suitable types of addressable data segments and file datasets include, for example, a mySQL database table and its records and a “flat file” database with its offset-indexed records. -
Process 914 transmitsdata 1010 representative of the file in its entirety (asFIG. 9 illustrates with a thickened arrow 915) toserver 990, which writes data of the file to afile data set 994 that it begins maintaining for user A in anaddressable data segment 992.Data 1010 can be suitably compressed, encrypted, or both. -
Process 914 transmits ane-mail message 1012 tocomputer 1030 of user B via ane-mail server 1040.Message 1012 includes a file reference (not shown) of the type discussed above with respect tosystem 100 ofFIG. 1 , e.g., a hyperlink or direct file access module. The file reference enables user B, throughprocess 934, to retrieve acopy 1050 of the file's data fromserver 990.Process 1030 writes the file's data to afile data set 1034 within adirectory 1032. - As illustrated in
FIG. 11 ,process 914 concludes with a copy of the file, at “rev 0,” in: (1)file data set 1024 of user A'scomputer 1020; (2)file data set 994 ofserver 990; and (3)file data set 1034 of user B'scomputer 1030. Also present at the conclusion ofprocess 914 is acopy 1044 of e-mail message 1012 (FIG. 10 ) inlocal storage 1042 ofe-mail server 1040. In a variation,e-mail server 1040 deletes any copy ofmessage 1012 afterprocess 934 retrieves it. - As may be better understood with reference to
FIGS. 9 and 12 , user B edits the file to “rev 1” throughprocess 934, which continuesmethod 900 by writing the resulting modifiedfile 1210 locally, writing a delta “rev 1” that represents the file modification to filedata set 1034 and transmittingdata 1212 representing the delta toserver 990.FIG. 9 illustrates the transmission of delta, rather than full, data withthin arrow 935. - A user's computer in a collaborative file update system according to various aspects of the invention advantageously avoids writing the entire data of an updated file back to a commonly accessible server when the computer has itself updated the file from a previous version that was received from the server. During
process 934 ofFIG. 12 , for example,computer 1030 determines that the file's “rev 0” is present in its localfile data set 1034. Thus,process 934 need only transmit thedelta data 1212 back toserver 990 instead of wastefully sending the entire contents of modifiedfile 1210. - A preferred data structure for housing file data sets may be better understood with reference to
FIG. 20-21 . As mentioned above,FIG. 20 illustrates a hierarchical directory structure ofaddressable data segment 1022, which resides on a hard disk 912 (FIG. 9 ) controlled by user A's computer 1020 (FIG. 10 ).Segment 1022 includes atop level directory 2010, which resides in a desired directory or the root of the hard disk's file structure, andsuccessive subdirectories - To facilitate fast and orderly selection of file data sets, a collaborative file update system according to various aspects of the invention can store the data sets as automatically named files within an automatically named succession of directories. For example, directories 2010-2030 of
file data segment 1022 have names that are different substrings of a plausibly unique identification code (not shown). Exemplaryfile data segment 1022 employs a 128-bit identification code (32 hexadecimal characters), which can be a “Globally Unique ID” (“GUID”) resulting from a standard call to the Microsoft Windows API.Top level directory 2010 uses the first two hexadecimal characters of this GUID code as its name, whiledirectories File data set 1024 uses the remaining 26 characters of the code as its name. Other types of plausibly unique codes can be employed, e.g., an SHA-1 hash of a concatenated file name, origination timestamp, and originating user name. - To facilitate tree balancing, e.g., in
hierarchical directory structures FIG. 20-21 , the plausibly unique identification code employed preferably has digits that are of a statistically uniform distribution. A GUID resulting from a call to the Microsoft WINDOWS 2000 or XP API may be considered sufficiently conforming to such a distribution while a GUID resulting from a call to the WINDOWS 95 API may be subjected to further processing to ensure a desired level of statistical uniformity. - As illustrated in
FIGS. 12-13 ,server 990 maintains a separatefile data set 1220 in anaddressable data segment 992 to house data (at this point, just the “rev 1” delta data) from user B'scomputer 1030. By maintaining a separate file data set for each user,server 990 avoids having to resolve write collisions caused by separate users storing several revisions to the file at the same time. Instead, whatever mechanism maintains the separate data sets (e.g., a kernel-level file system where data sets 994, 1220 are standard computer files) takes care of resolving simultaneous document edits. -
FIG. 21 depictsaddressable data segment 992 in detail, illustrating a hierarchy of four directories 2110-2140 and twofile data sets level directory 2140. Directories 2110-2130 use as their names the first, second, and third pairs of alphanumeric characters, respectively, of a 32-character code as described above.Directory 2140 uses the remaining 26 characters of the code as its name.File datasets - As may be better understood with reference to
FIG. 9 as well asFIGS. 12-13 ,method 900 continues withprocess 916 receivinge-mail message 1240, relayed frommessage 1230 byserver 1040. User A accesses “rev 1” data fromserver 990 via a file reference (none shown, but see e. g.FIG. 6B ) ine-mail message 1240. Becausefile data set 1024 of user A'scomputer 1020 already includes “rev 0” data of the file,server 990 transmits justdelta data 1310, which is a copy ofdelta data 1210 that user B'scomputer 1030 transmitted toserver 990 inprocess 934.Data 1310 can include additional data elements, such as the date and time on whichcomputer 1030 transmitted theoriginal data 1210, information about other copies ofdata 1210 accessed by other users, etc.Data data 1210 being more compressed in view of clients' typically slower upload data rates. - After receiving “
rev 1” of the file, user A edits the file to “rev 2” through process 916 (FIGS. 9, 14 ), transmitting thedelta data 1405 back toserver 990 and ane-mail message 1410 including a reference to the new file revision to user B (e-mail copy 1420 to process 936) and to user C (e-mail copy 1430 to process 954) viae-mail server 1040.Server 990 keeps the “rev 2” delta data indata set 994, which it maintains for user A. - As may be better understood with reference to
FIG. 15 ,process 936 retrievesdelta data 1510 for “rev 2” of the file fromserver 990, which retrieves the data fromdata set 994.Process 936 only needsdelta data 1510 rather than a complete copy of the file's new revision because it has a “rev 1” local copy of thefile 1210 in its localfile data set 1034. Updating copy 1210 (e.g., by replacing specified bytes or blocks) based ondelta file 1510 is straightforward.Process 954, however, has no previous copy (or any copy, for that matter) of the file and thus obtains the entire contents of the “rev 2”file 1520. - User A continues editing the file and, at process 918 (
FIG. 16 ), transmitsdelta data 1605 representing “rev 3” of the file toserver 990. Again, only delta data is necessary becauseserver 990 has an immediately previous version of the file.Process 918 also transmits ane-mail message 1610 containing a reference to the new revision tocomputer 1630 ofuser C. Process 974 receives the message via acopy 1620 relayed bymail server 1040. AsFIG. 17 illustrates,process 974 retrieves fromserver 990data 1710 of the file's “rev 3” as updated.Server 990 constructsdata 1710 from the “rev 2” state of the file based on contents ofdata set 994, whichserver 990 maintains for revisions from user A as discussed above. - Alternatively,
server 990 can avoid maintaining copies of the file at various revisions by patching the original “rev 0” state of the file, as received fromprocess 914 ofFIG. 10 and stored indata set 994, with the “rev 1” delta data that is also stored indata set 1220, then patching the resulting “rev 1” state of the file with “rev 2” delta data indata set 994, then patching the resulting “rev 2” state of the file with the “rev 3” delta data, also indata set 994. -
Process 974 writescopy 1710 of the file to a localfile data set 1720. As may be better understood with reference toFIG. 18 , user D then modifies the file throughprocess 974, storing alocal copy 1810 of the file at “rev 4” and transmittingdelta data 1820 representing the differences of “rev 4” back toserver 990.Server 990 writes the delta data to adata set 1830 that it begins maintaining for data fromcomputer 1630 ofuser D. Process 974 transmits ane-mail message 1840 designating users A, B, and C as recipients of the file's “rev 4” toe-mail server 1040. - As illustrated in
FIG. 19 ,e-mail server 1040 relayscopies message 1840 tocomputers computer 1020 retrievesdelta data 1912 fromserver 990.File data set 1024 includes “rev 3” of the file and thus only a delta from that revision to “rev 4” is necessary. User B'scomputer 1030 and user C'scomputer 1440 retrievedata 1932 of the file's full contents at “rev 4” because neitherfile data set 1034 ofcomputer 1030 norfile data set 1530 ofcomputer 1440 include the file at the immediately previous “rev 3.” - Various desirable features of an electronic mail file access according to various aspects of the invention can be employed during
method 900. Generally as discussed above with reference toFIG. 7 , for example,delta data 1212 can consist substantially of indicia of differences between individual bytes of the file's revision zero and revision one contents. In other words,data 1212 need not include any data of substance (i.e., relating to the file contents) except such byte differences. An alternative, as generally discussed above with reference toFIG. 8 , is fordata 1212 to consists substantially of indicia of differences between individual blocks of the two file revisions' contents. - E-mail messages transmitted during operation of a collaborative file update system according to various aspects of the invention can advantageously include “Viewer” and “Editor” fields of the type discussed above with reference to
FIGS. 4-5 . Whenmethod 900 sends such messages, for example, message 1012 (FIG. 10 ) designates user B as an editor because user B is authorized to modify the file thatmessage 1012 references, as evidenced by the file modification of process 934 (FIG. 13 ). Message 1410 (FIG. 14 ), whichmail server 1040 relays asmessages processes - In a method for facilitating collaborative updating of a file according to various aspects of the invention, data representing an initial version of the file is accepted from one of a plurality of users and stored. As discussed above with reference to
exemplary method 900, server 990 (FIG. 10 ) acceptsdata 1010 representing an initial version of a file from user A'scomputer 1020. One or more recipients of the initial version is designated, for example userB having computer 1030 inmethod 900. - Then, for each one of a plurality of sequentially updated versions of the file, data is accepted, from one of the plurality of users, representative of the difference between the updated version of the file and the immediately previous version of the file. For example,
server 990 accepts data 1210 (FIG. 12 ) representative of the difference between “rev 1” of the file as updated by user B and the immediately previous “rev 0” of the file originated by user A. One or more recipients of the updated version is designated, for example user A (designated via an e-mail message 1230) inprocess 934 of method 900 (FIG. 9 ). As another example, after sequentially updated versions “rev 2” and “rev 3,”server 990 acceptsdata 1820 representative of a difference between an updated “rev 4” version of the file and an immediately previous “rev 3” from user D's computer 1630 (FIG. 18 ). In this example,e-mail message 1840, whiche-mail server 1040 relays asmessages FIG. 19 ), designates users A, B, and C as recipients of this updated version. - In the method, the data transmitted to each recipient designated as a recipient of the updated version and having accessed the immediately previous version consists substantially of the difference between the updated version of the file and the previous version of the file. At
process 920 ofmethod 900, for example,server 990 transmits only delta data 1912 (FIG. 19 ) to user A'scomputer 1020 because user A is designated as a recipient of the updated “rev 4” and was also designated as a recipient of the immediately previous “rev 3.” Conversely,server 990 transmitsdata 1932 representing the file as updated to users B and C because those users did not access the immediately previous version of the file either as an originator or editor of that version, or as a designated recipient of that version. - The detailed description of preferred exemplary embodiments above mentions the detailed description portions of certain patents and publicly accessible patent applications, all of which are hereby incorporated herein by reference. The detailed description portions of all U.S. patents and patent applications incorporated by reference into these listed patents or applications are also specifically incorporated herein by reference.
- Public Notice Regarding the Scope of the Invention and Claims
- The inventors consider various elements of the aspects and methods recited in the claims filed with the application as advantageous, perhaps even critical to certain implementations of the invention. However, the inventors regard no particular element as being “essential,” except as set forth expressly in any particular claim.
- While the invention has been described in terms of preferred embodiments and generally associated methods, the inventors contemplate that alterations and permutations of the preferred embodiments and methods will become apparent to those skilled in the art upon a reading of the specification and a study of the drawings.
- Additional structure can be included, or additional processes performed, while still practicing various aspects of the invention claimed without reference to such structure or processes.
- Accordingly, neither the above description of preferred exemplary embodiments nor the abstract defines or constrains the invention. Rather, the issued claims variously define the invention. Each variation of the invention is limited only by the recited limitations of its respective claim, and equivalents thereof, without limitation by other terms not present in the claim.
- In addition, aspects of the invention are particularly pointed out in the claims using terminology that the inventor regards as having its broadest reasonable interpretation; the more specific interpretations of 35 U.S.C. §112(6) are only intended in those instances where the terms “means” or “steps” are actually recited.
- The words “comprising,” “including,” and “having” are intended as open-ended terminology, with the same meaning as if the phrase “at least” were appended after each instance thereof. A clause using the term “whereby” merely states the result of the limitations in any claim in which it may appear and does not set forth an additional limitation therein. Both in the claims and in the description above, the conjunction “or” between alternative elements means “and/or,” and thus does not imply that the elements are mutually exclusive unless context or a specific statement indicates otherwise.
Claims (8)
Priority Applications (1)
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US11/833,503 US20080010378A1 (en) | 2003-07-10 | 2007-08-03 | Collaborative File Update System |
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Also Published As
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AU2004258591A1 (en) | 2005-01-27 |
JP2007531071A (en) | 2007-11-01 |
EP1649340A2 (en) | 2006-04-26 |
WO2005008407A3 (en) | 2006-09-08 |
WO2005008407A2 (en) | 2005-01-27 |
US7277901B2 (en) | 2007-10-02 |
US20050010607A1 (en) | 2005-01-13 |
CA2531840A1 (en) | 2005-01-27 |
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