WO2000067119A9 - Methods and apparatuses for file synchronization and updating using a signature list - Google Patents
Methods and apparatuses for file synchronization and updating using a signature listInfo
- Publication number
- WO2000067119A9 WO2000067119A9 PCT/US2000/012048 US0012048W WO0067119A9 WO 2000067119 A9 WO2000067119 A9 WO 2000067119A9 US 0012048 W US0012048 W US 0012048W WO 0067119 A9 WO0067119 A9 WO 0067119A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- file
- segment
- computer
- subscription file
- current version
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/60—Software deployment
- G06F8/65—Updates
- G06F8/658—Incremental updates; Differential updates
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- 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
- Y10S707/99931—Database or file accessing
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- 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
Definitions
- the present invention relates to the field of personal computers which access files on network drives and which utilize electronic mail systems.
- the present invention involves the synchronization of the local copies of files on user's client computer hard disk to the current versions of the files on a network drive.
- push is the process of automatically delivering user-requested information electronically. It is not an application, but merely a function or feature in a product. There are clear distinctions between the three different categories of push-based application: content, software, and document.
- ESL Software Distribution
- software push as a way of addressing the need to seamlessly deliver software updates across the network with the goal of directly impacting the total cost of ownership.
- the requirements for software distribution are dramatically different from content distribution.
- the "content” in software delivery is, by its very nature, deemed critical.
- Companies that do not use some form of software push technologies require dedicated individuals to make the rounds updating software by remstalling or applying patches for each personal computer and laptop.
- the Next Phase is Electronic Document Delivery.
- the final frontier in digital push is "electronic document delivery'Or EDD. It deals with dehvering changes or "updates" to the same physical files (like software push), but the files themselves are highly personalized (like content push). Different from content push, these files exist in the form of sales presentations (PowerPoint), spreadsheets (Excel and Lotus 1,2,3), and reports and plans (Word or WordPerfect). These are the types of documents for which companies currently invest millions of dollars in file servers and intranet technologies in order to share among respective workgroups.
- the important distinction here between content and document push is the fact that EDD delivers data that currently exists in its native format within corporations and whose value is clearly understood by the company, MIS, and the end-user.
- An object of the present invention is to provide a mechanism by which a user can be automatically provided with a current version of a file to which he subscribes.
- Another object of the present invention is to communicate the current version of the file in an efficient manner.
- a server computer monitors network files and folders stored on the network for changes and then sends the user email notifications and updates when monitored items change.
- a server computer generates an update file for transmission to a client computer that permits the client computer to generate a copy of a current version of a subscription file from a copy of an earlier version of the subscription file.
- the server computer periodically reads the subscription file from the network drive and divides the subscription file into variable-length segments based upon a segment delimiter.
- the server computer computes a signature for each segment and stores the segment signature along with the beginning position and length of each segment in a current version of the signature list.
- the server computer also maintains the earlier version of the signature list.
- the server computer For each segment of the current version of the subscription file, the server computer searches an earlier version of a signature list for an old segment signature which matches a new segment signature corresponding to the segment. When a match is detected, the server computer writes a command in the update file for the client computer to copy an old segment of the client computer's copy of the earlier version of the subscription file into the client computer's copy of the current version of the subscription file, where the old segment corresponds to the segment for which a match was detected.
- the command need only specify the location within the earlier version of the file where the old segment is stored, rather than the actual data that is stored at this position. This information is found in the signature list in the beginning location and size fields.
- the beginning location field is preferably expressed as a number of bytes from the beginning of the file.
- the correct old segment can be copied into the client computer's copy of the current version of the subscription file.
- the size of the copy command is negligible in comparison to the size of the segment to which it pertains. This savings reduces the size of the update file, and thus reduces the connection time in communicating the update file to the client computer.
- the server computer When no match is detected in the earlier version of the signature list, the server computer writes a command into the update file for the client computer to insert a new segment of the current version of the subscription file into the chent computer's copy of the current version of the subscription file, where the new segment of the current version of the subscription file is written into the update file. Because the new segment of the current version of the subscription file contains the actual data of the new segment, the new segment of the current version of the subscription file may be compressed to reduce the size, encrypted for security, or both, by the server computer before being written into the update file.
- the server computer transmits the update file to the chent computer as an executable attachment via electronic mail.
- the update file is only generated when the server computer determines that the subscription file has changed.
- the server computer periodically monitors the subscription file to determine if it has been altered before generating an update file.
- the user determines the periodicity of the checks to determine if the file has been altered, and if so, to generate the update file and send it as an electronic mail.
- Figure 1 illustrates a general purpose computer architecture suitable for implementing the methods according to the present invention.
- Figure 2 illustrates a network of computers suitable for implementing the methods according to the present invention.
- Figure 3 illustrates an earlier version of a subscription file broken into six segments and the signatures corresponding to the six segments suitable for use with the methods according to the present invention.
- Figure 4 illustrates an earlier version of a signature list according to the present invention corresponding to the earlier version of the subscription file shown in Figure 3.
- Figure 5 is a flow chart illustrating a method according to the present invention of building a signature list corresponding to a subscription file.
- Figure 6 illustrates a current version of the subscription file shown in Figure 3 broken into seven segments and the signatures corresponding to the seven segments suitable for use with the methods according to the present invention.
- Figure 7 illustrates a current version of a signature list according to the present invention corresponding to the current version of the subscription file shown in Figure 6.
- Figure 8 illustrates the correspondence of the current version of the subscription file to the earlier version of the subscription file and the segments which are communicated to the client computer from the server computer in an update file according to the present invention.
- Figure 9 illustrates the creation of a current copy on the client computer of the current subscription file from a copy of the earlier version of the subscription file on the client computer using the update file.
- Figure 10 is a flow chart illustrating a method according to the present invention of generating an update file from the current version of the subscription file and the current and earlier versions of the signature list.
- FIG 11 illustrates an update file generated by the method according to the present invention illustrated in Figure 10 applied to the earlier and current versions of the signature list illustrated in Figures 4 and 7, respectively.
- Figure 12 illustrates a large and diverse network of computers suitable for implementing the methods according to the present invention.
- Symantec Mobile UpdateTM (Symantec Mobile Update is a trademark of Symantec Corporation and its subsidiaries) according to the present invention, through a combination of server-based "delta technology" and client-based “update agent technology", adds "intelligence" to document delivery by automatically offering a seamless way of receiving changes to corporate documents.
- the next section discusses the technology used by Mobile Update according to the present invention to bring "intelligence" to document delivery.
- Mobile Update according to the present invention is designed primarily to serve the mobile professional as the target user, who relies on copies of the most up-to-date documents to be effective, but who is not always connected to the network to access changes.
- the Mobile Update solution is comprised of a server portion (for tracking files on the network and processing changes) and a client portion (for managing document "subscriptions" and for incorporating changes into existing documents).
- the Mobile Update Client portion is used to create and manage subscriptions to network documents.
- the process of selecting files to be monitored is referred to as "subscribing”. Users browse to the network directory where the desired files are stored and select either individual files or folders (excluding sub-folders).
- the user determines the polling or monitoring interval for the server to check for changes and also what to do when changes occur, i.e., package and send file changes or simple notification.
- the information is passed to the server and stored in its database.
- the Mobile Update Server acts as an "electronic assistant" on the network, tracking documents for changes. It polls files or subfolders at either user-defined intervals for any changes to date, time stamps. When it detects a change, it checks the integrity of the file, then decides whether it needs to deliver the actual changes or simply notify send notice of a file change.
- Figure 1 illustrates a general purpose computer system 100 suitable for implementing the methods according to the present invention.
- the general purpose computer system 100 includes at least a microprocessor 104.
- the general purpose computer may also include random access memory 102, ROM memory 103, a keyboard 107, and a modem 108.
- All of the elements of the general purpose computer 100 are optionally tied together by a common bus 101 for transporting data between the various elements.
- the bus 101 typically includes data, address, and control signals.
- the general purpose computer 100 illustrated in Figure 1 includes a single data bus 101 which ties together all of the elements of the general purpose computer 100, there is no requirement that there be a single communication bus 101 which connects the various elements of the general purpose computer 100.
- the microprocessor 104, RAM 102, and ROM 103 are alternatively tied together with a data bus while the hard disk 105, modem 108, keyboard 107, display monitor 106, and network interface 109 are connected together with a second data bus (not shown).
- the first data bus 101 and the second data bus are linked by a bidirectional bus interface (not shown).
- some of the elements, such as the microprocessor 102 and RAM 102 are connected to both the first data bus 101 and the second data bus (not shown), and communication between the first and second data bus occurs through the microprocessor 102 and RAM 102.
- the network interface 109 provides communication capability to a local area network LAN using an ethernet connection, for example.
- the modem 108 allows the computer 100 to communicate through the telephone system.
- the methods of the present invention are executable on any general purpose computer system such as the 100 illustrated in Figure 1, but there is clearly no limitation that this computer system is the only one which can execute the methods of the present invention.
- FIG. 2 illustrates a network of computers suitable for implementing the methods according to the present invention.
- a client computer 201 is connected to a network drive 202 through link 205.
- a server computer 203 is connected to a network drive 202 through a link 206.
- the client computer 201 and server computer 203 are logically connected by a link 207 for communication between them.
- the server computer 203 is logically connected to an electronic mail facihty 204 through link 209.
- Chent computer 201 is logically connected to the electronic mail facihty 204 through link 208.
- the logical connections 207, 208, and 209 are not necessarily physical connections.
- the chent computer 201 is alternatively a remote computer which periodically connects to the network drive 202 through a modem. In this event, the modem (not shown) provides the physical connection through which the logical connections 205, 207, and 208 are implemented.
- Figure 2 illustrates the interaction between client, server, and network according to the present invention.
- the user browses the network through link
- the chent computer 201 sends the subscription information to the server computer 203 through logical link 207.
- the server computer 203 polls the network 202 through link 206 for changes to the subscription files.
- the server sends update files to the chent computer 201 through the email facility 204 through logical link 209.
- the chent computer receives update files through the logical link 208.
- Symantec's Delta Technology has been optimized to detect and process changes quickly and efficiently, while concurrently mamtainrng the integrity of the file.
- the server takes a "digital snapshot” that forms the basis for determining changes made to the file in the future.
- the server reads the file from the network and determines the most efficient "delimiter” or "dividing point” to break the file into segments as shown in Figure 3.
- a digital 'snapshot' is comprised of a series of segments which define the overall contents and structure of a file.
- a file can be segmented into hundreds, if not thousands, of segments depending on the file size and type.
- Figure 3 illustrates an earher version of a subscription file broken into six segments and the signatures corresponding to the six segments suitable for use with the methods according to the present invention.
- Segments Al through A6 represent variable length portions of the earher version of the subscription file.
- the ends of each of the segments (Al through A6) are determined by segment delimiters 301 through 306.
- the segment delimiters 301 through 306 are specific portions of data, perhaps bytes, that are statistically determined to be an optimal, or at least acceptable, division point for the variable length segments Al through A6 for the earher version of the subscription file.
- Signatures 311 through 316 are fixed length values derived from the variable length segments
- the signatures 311 through 316 may be determined by any one of a variety of hashing methods or signature algorithms.
- the signatures Al through A6 are computed using the cyclic redundancy check (CRC).
- CRC cyclic redundancy check
- any signature algorithms may be used according to the present invention.
- MD5 can be used to derive a fixed length digital signature from the variable length segments.
- Figure 4 illustrates an earher version of a signature list according to the present invention corresponding to the earher version of the subscription file shown in Figure 3.
- the signature list 400 shown in Figure 4 further includes the starting locations 401 through 406 of each of the segments Al through A6 shown in Figure 3.
- the starting locations 401 through 406 are preferably represented as byte address locations relative to the beginning of the earher version of the subscription file.
- an offset representing the location of the beginning of the earher version of the subscription list is combined with each of the segment location values 401 through 406 to determine the address of the begirning of each of the segments within the address space within which the segments Al through A6 are stored.
- the signature list 400 also includes a segment size field which stores the size of each of the variable length segments Al through A6 as a number of bytes within the variable length segment to which it corresponds.
- the segment location and segment size allow the addresses of all of the data within the segment to be computed.
- the information necessary to compute the addresses of the pieces of data within each segment could be represented in some alternative manner. For example, instead of attaching the segment size within the signature hst, the ending location of each segment could alternatively be stored according to the present invention.
- FIG. 5 is a flowchart illustrating a method according to the present invention of building a signature hst corresponding to a subscription file.
- the method starts at step 501.
- the subscription file is read from the network drive 202. If the subscription file read from the network drive is a new subscription file, test 503 delivers the method to step 504 where the most efficient segment delimiter is determined for that new subscription file.
- the byte value which represents the segment delimiters 301 through 306 shown in Figure 3 are computed at step 504 the first time that the subscription file is read.
- step 503 delivers the message to step 505, where the delimiter corresponding to the subscription file is retrieved from a table (not shown) which stores the values of the segment delimiters which correspond to each of the subscription files that the server computer 203 monitors.
- the method scans the file from the beginning for the delimiter in order to determine the first variable length segment corresponding to that subscription file. If the end of the file is reached before the delimiter is found, then step 506 marks that as a segment, and that will be the last segment corresponding to the subscription file.
- the segment delimiter 306, which pertains to the last segment A6, is the last byte in the file, and is not necessarily the same value as the other segment delimiters 301 through 305.
- the signature for the variable length segment is computed.
- the signature is added to the signature list along with the beginning location and segment size corresponding to the segment.
- Test 509 determines whether or not the segment ends with the delimiter. If the segment ends with the delimiter, then it is not the last segment in the subscription file, and therefore the test 509 returns the message to step 506 so that the next variable length segment can be determined. If the segment does not end with the delimiter, then it is assumed that it is the end of the file, and the method 500 is completed.
- the signature list corresponding to the subscription file has been computed and stored.
- a second "snapshot" is generated using the same process as the first snapshot as shown in Figure 7.
- the new or changed segments are accompanied by unchanged segments, depending on the number and severity of the changes made to the file.
- the Delta Engine according to the present invention then compares the two sets of segments to determine which segments have been altered, which ones are new and which ones have remained unchanged, as illustrated in Figure 8.
- Figure 6 illustrates a current version of the subscription file shown in Figure 3 broken into seven segments and the signatures corresponding to the seven segments suitable for use with the methods according to the present invention.
- Segment delimiters 601 through 607 represent byte codes which were determined for this subscription file to indicate the end of each of the segments Bl through B7.
- Signatures 611 through 617 represent fixed length signatures computed from each of the seven segments Bl through B7.
- Figure 7 illustrates a current version of a signature list according to the present invention corresponding to the current version of the subscription file shown in Figure 6.
- the signature list 700 includes the segment signatures 701 through 707 corresponding to the variable length segments Bl through B7 shown in Figure 6 and the corresponding segment locations 721 through 727 representing the beginning position of each of the segments Bl through B7 as well as the segment sizes 711 through 717 corresponding to each of the segments Bl through B7.
- the engine according to the present invention extracts new or changed segments and bundles these into a file, called an Update File. This file is then optionally compressed to reduce its size even further.
- an Update File contains just the changes made to a file, in a compressed state, as shown in Figure 8.
- Figure 8 illustrates the correspondence of the current version of the subscription file to the earher version of the subscription file and the segments which are communicated to the chent computer from the server computer in an update file according to the present invention.
- the earher version of the subscription file shown in Figure 3 and the current version of the subscription file shown in Figure 6 pertain to the same file name. They are different versions of the same file.
- Figure 8 shows the current version of the subscription file.
- Figure 8 is annotated to show which segments within the current version of the subscription file are the same or identical to a segment within the earher version of the subscription file.
- each of the segments Bl, B3, B6, and B7 are the same as a corresponding segment within the earher version of the subscription file shown as segments Al through A6 in Figure 3.
- segments B2, B4, and B5 are each different from any of the segments Al through A6 shown in Figure 3.
- the new or changed segments B2, B4 and B5 are extracted from the current version of the subscription file stored on the network drive 202 by the server computer 203, and are packaged in an update file 801 for transmission to the chent computer 201 shown in Figure 2 so that the chent computer 201 can build a copy of the current version of the subscription file from its copy of the earlier version of the subscription file.
- Figure 9 illustrates the creation of a current copy on the chent computer of the current subscription file from a copy of the earher version of the subscription file on the chent computer using the update file 801 shown in Figure
- Figure 9 shows the copy of the earher version of the subscription file 901 as well as the data contents of the update file 902 as it corresponds to the chent computer's copy of the current version of the subscription file 903.
- Figure 9 shows arrows 910 through 913 which indicate segments which the chent computer 201 can copy from its earher version of the subscription file into the current version of the subscription file.
- segment Al is illustrated by arrow 910 as being copied into segment CI of the copy of the current version.
- segment A3 may be copied into segment C3
- segment A5 may be copied into segment C6
- segment A6 may be copied into segment C7.
- Arrows 920 through 922 show segments which are inserted from the update file
- segment B2 is inserted from the update file 902 into the copy of the current version of the subscription file at segment C2.
- Segment B4 is inserted from the update file 902 into the copy of the current version 903 at segment C4.
- Segment B5 is inserted from the update file 902 into the copy of the current version 903 at segment C5.
- Dotted rectangle 950 illustrates data that is resident on the chent computer 201.
- Update file 902 is communicated to the chent computer 201 through an electronic mail facihty 204.
- the update file 902 must be transmitted to the chent computer 201 through whatever communication link the chent computer 201 uses to access its electronic mail 204.
- This link 208 shown in Figure 2 may be a modem, an ethernet connection, or some other communication device.
- the present invention maximizes the information already stored on the chent computer 201 and minimizes the information needed to be transmitted to the chent computer 201 in order to create the copy of the current version of the subscription file. Specifically because segments Al, A3, A5, and A6 are identical to corresponding segments in the current version of the subscription file, they need not be transmitted to the chent computer 201 through the electronic mail facihty
- Figure 10 is a flowchart illustrating a method according to the present invention of generating an update file from the current version of the subscription field and the current and earher versions of the signature list.
- the method starts at step 1001.
- the method compares the new segment signature to an old segment signature.
- the new segment refers to segments within the current version of the subscription file;
- the old segment signature refers to segment signatures within the earher version of the subscription file.
- Step 1002 begins with the first new segment signature in the current version of the subscription file. For example, step 1002 begins with the segment signature 701 pertaining to segment Bl . Step 1002 compares the new segment signature to the old segment signature. Step 1002 begins with the first old segment signature, for example the segment signature 311 corresponding to segment Al shown in Figure 4.
- step 1002 determines that there is a match between the new segment signature and the old segment signature
- the method 1000 writes a command in the update file to copy the old segment into the chent computer' s copy of the current version of the subscription file at step 1003.
- step 1007 determines if the last new segment signature in the new signature list has been processed and if so, the method is done at step 1009. For example, when the method gets to the new segment signature 707 corresponding to segment B7, step 1007 will indicate that the method is done. However, if there are more new segment signatures to be processed, step 1007 delivers the message to step 1008 which retrieves the next new segment signature, and then returns the method to step 1002.
- step 1002 dehvers the method to step 1004, where it is determined whether or not the last old segment signature in the old signature list has been compared to the new segment signature. If test 1004 determines that there are no more old segment signatures in the old signature hst, for example the segment signature 316 corresponding to segment A6 shown in Figure 4, then test 1004 delivers the method to step 1006 where the server computer writes a command in the update file to insert the new segment into the chent computer's copy of the current version of the subscription file. In other words, if step 1006 is reached, then there were no matches for the new segment signature in the old segment signature list. Then the method reverts to test 1007.
- FIG 11 shows the update file which is communicated to the chent computer 202 via electronic mail. Although the preferred embodiment of the present invention involves electronic mail transmission of the update file to the chent computer 201, there is no requirement that an electronic mail facihty be used.
- Figure 11 illustrates an update file generated by the method according to the present invention illustrated in Figure 10 apphed to the earher and current versions of the signature hst illustrated in Figures 4 and 7, respectively.
- the update file 1100 shown in Figure 11 is preferable an executable attachment to an electronic mail that is received by the client computer 201.
- the command 1101 implements the copy of segment Al into segment CI illustrated by the arrow 910 shown in Figure 9.
- the insert command 1102 implements the insertion of the segment B2 into segment C2 by arrow 920 shown in Figure 9.
- the copy command 1103 implements the copying of segment A3 into segment C3 shown by arrow 911 in Figure 9.
- the command 1104 implements the copying of segment B4 into segment C4 illustrated by arrow 921 shown in Figure 9.
- the command 1105 implements the copying of segment B5 into segment C5 illustrated by the arrow 922 shown in Figure 9.
- the command 1106 implements the copying of the segment A5 into segment C6 illustrated by arrow 912 shown in Figure 9.
- the copy command 1107 implements the copying of segment A6 into segment C7 illustrated by arrow 913 in Figure 9.
- Each of the copy commands 1101, 1103, 1106, and 1107 must specify for the chent computer 201 where the segments to which they pertain are actually stored on the chent computer. Because the chent computer does not store the signature hsts or have any knowledge of the fact that the subscription files are broken into segments by the server computer, the update file must include address information necessary to effectuate the copying of the correct bytes into the copy of the current version of the subscription file.
- each segment is included as arguments to each of the copy commands so that the chent computer can compute the address of the correct bytes.
- the chent computer stores the copies of the subscription files as standard files within its operating system and only knows the beginning location and size of the entire file.
- the location and size information included in each copy command by the server computer 203 is combined with the file offset value at the chent computer in order for the chent computer to calculate the range of addresses to be copied.
- the server computer 203 has no way of knowing where exactly on the chent computer's hard disk that the chent computer stored the earher version of the subscription file.
- the insert commands 1102, 1104, and 1105 include the actual contents of the segments B2, B4, and B5, respectively.
- the segment size is variable, the inclusion of the actual contents of the new or changed segments B2, B4, and B5 represent the vast bulk of the update file 1100.
- the copy commands 1101, 1103, 1106, and 1107 are negligible in size in comparison to the contents of the actual new or changed segments which must be transmitted.
- the update file 902 and in Figure 8, the update file 801 are illustrated solely by the contents of the segments B2, B4, and B5 and omit illustrating the actual copy and insert commands because they are neghgible in size to the actual content of the transmitted segments.
- the segments are transmitted via electronic mail, they may be further compressed to reduce their size and thereby minimize connection time in receiving the electronic mail.
- the update file 902 is optionally encrypted for security purposes according to the present invention.
- the server creates an email message and sends the Update File as a simple binary attachment to the user.
- the user receives updates through the user's standard email chent. For mobile professionals, this means making one connection to the network to receive all messages and document updates. It also means that the size of the attachment is a fraction of the full file, containing only the changes to be apphed. In other words, the user performs the standard task of checking email — i.e. a task that is familiar, secure, and, for the most part, reliable.
- the user simply launches or opens the attachment (again, in a way they are most familiar with) and the Mobile Update
- Agent processes the changes automatically. It does this by substituting the new and modified segments in the Update File with the segments in the existing file, as illustrated in Figure 9.
- segment B2 is a replacement segment for A2 in the current file. A2 is removed and B2 takes its place.
- Segment B4 is a brand new segment that fits in after A3, and the files to the right of it (i.e., A4, A5, and A6) are moved over by one segment.
- segment B5 replaces A4 as it is the modified segment for A4.
- the Mobile Update Server preferably runs as a service under Windows NT 4.0 (Workstation or Server) and can run across virtually any network operating system that supports Windows NT. However, it should be noted that the server according to the present is alternatively implemented so as to run under any operating system.
- the server according to the present invention requires its own mail chent (account) that is capable of sending and receiving email messages through the corporate mail server.
- the server uses the mail chent to receive and process email-based subscription changes and requests automatically generated by clients when they are in off-hne mode (i.e. , not connected to the network). It also uses the mail chent to create and send notification and update requests to its users. In addition, the server requires a network account with access rights that encompass those of its users, i.e. it should at least share the same profile as its users. This allows the server to access network files on the user's behalf to check for changes.
- the adrrrinistrator When installing the server, the adrrrinistrator specifies where chent install files should be located on the network for easy install access by users. Once the server is set up, the user installs the client from the network drive. Each chent is registered with the server and writes its user name, email address, etc. , to the server's database. The chent can now subscribe to any network-based files located on a shared directory.
- Figure 12 illustrates a large and diverse network of computers suitable for implementing the methods according to the present invention.
- the server computer 1201 accesses subscription files stored on any of the file servers
- the personal computers 1210 through 1212 are connected to local area network 1216.
- Remote personal computers 1213 through 1215 dial in to modems 1218 through 1220 respectively in order to receive their electronic maU from the electronic maU facihty 1221 and receive update files corresponding to the subscription files to which they subscribe.
- Figure 12 iUustrates a sample deployment for MobUe Update according to the present invention.
- the chents runs in both on-line mode and off-line mode.
- the chent runs in on-line mode when it is on the network where it can communicate directly with the server's database.
- the chent runs in off-line mode when the user is mobile and not connected to the network.
- the user communicates with the server through email messaging. If changes are made to the properties of a subscription, such as a change in polling frequency or a re- sync request is made, the Mobile Update chent automatically generates an email message to the server which is then placed in the outbox of the user's mail client. These messages are then sent when the user logs on to check or send e-mail. The messages are then received by the server's mail chent and parsed and processed accordingly.
- the Mobile Update Server according to the present invention can access virtually any WAN-based server, providing it has the necessary network access rights, as illustrated in Figure 12.
- Symantec Mobile Update is the first solution in the document delivery or "push" category in which currently existing data like reports, spreadsheets, presentations, etc., are dehvered to the desk-top 'intelligently'. It does this by watching the network files of folders for changes, dehvering "just the changes” or notifies of changes, uses one famihar and reliable connection to deliver those changes (email), and provides seamless functionality, thereby leveraging the way users currently work (in email).
- Document push like software push, is only compelling if it can deliver clear value to end-users and corporate IS.
- Mobile Update according to the present invention offers two tiers of benefits to corporations. For the mobile user, it receives updates anywhere, anytime (location-independent), it stays up-to-date on changes to key documents, it reduces download time for email attachments, and it reduces the hassle of accessing changes to key documents.
Abstract
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