Method and system for creating and utilizing common caches for internetworks

• US 5,878,218 A
• Filed: 03/17/1997
• Issued: 03/02/1999
• Est. Priority Date: 03/17/1997
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: McBrearty, Gerald Francis, Shieh, Johnny Meng-Han, Maddalozzo, John Jr.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): VU, VIET DUY
• Application Number:
  US08/819,185
• Time in Patent Office: 715 Days
• Field of Search: 395/200.43, 395/200.44, 395/200.45, 395/200.46, 395/200.47, 395/200.48, 395/200.49, 395/200.53, 395/200.56, 707/8, 707/9, 707/10, 707/201, 707/203, 711/147, 711/153, 711/141
• US Class Current: 709/213
• CPC Class Codes: G06F 16/10 File systems; File servers

Abstract

An improved method and system for accessing the most recent version of a requested data file that has been downloaded into a private network from a source external to the private network. The objects of the method and system are achieved as is now described. A network of computers is defined as private relative to one or more other networks of computers. More than one computer within said defined private network is specified as composing a "common cache." A copy of any data file entering the defined private network from a source external to the defined private network is cached at one or more computers which compose the defined "common cache." In response to a request from a computer within the defined private network for a specific data file which originates from a source external to the defined private network, a determination is made as to whether a copy of the requested specific data file is resident within the defined "common cache." The most recent version of the requested specific data file which is resident within said defined "common cache" is obtained if it was determined that a copy of the requested specific data file is resident within the defined "common cache." The requested specific data file is obtained from a source external to the defined private network if it was determined that a copy of the requested specific data file is not resident within the defined "common cache."

Claims

1. An improved method for accessing a most recent version of a requested data file that has been downloaded into a private network from a source external to said private network, said method comprising the steps of:

establishing a network of computers as private relative to one or more other networks of computers;

specifying one or more computers within said defined private network as defining a common cache;

caching within said defined common cache a copy of a first data file entering said defined private network from a source external to said defined private network;

caching within said defined common cache a copy of a second data file entering said defined Private network from a source external to said defined private network, wherein said second data file is a most recent version of said first data file and has some content different from said first data file;

in response to a request from a computer within said defined private network for a specific data file which originates from a source external to said defined private network, determining that said requested specific data file corresponds to said first and second data files resident within said defined common cache; and

in response to said determining step, obtaining a most recent version of said requested specific data file by transmitting the second data file which is resident within said defined common cache.

2. The method of claim 1, further comprising the step of:

in response to said determining step, obtaining said requested specific data file from a source external to said defined private network if said determining step indicates that a copy of said requested specific data file is not resident within said common cache.

3. The method of claim 1 wherein said step of establishing a network of computers as private relative to one or more other networks of computers further comprises the step of defining a network being served by a public Internet Host as private relative to the public Internet.

4. The method of claim 1 wherein said step of specifying one or more computers within said defined private network as defining a common cache further comprises the step of:

defining at least one network gateway server within said private network as said defined common cache.

5. The method of claim 1 wherein said step of caching a copy of a data file entering said defined private network from a source external to said defined private network within said defined common cache further comprises the steps of:

saving a copy of said data file at one or more computers making up said defined common cache.

6. The method of claim 1 wherein said step of caching within said defined common cache a copy of a data file entering said defined private network from a source external to said defined private network further comprises the steps of:

saving a copy of said data file at one or more computers making up said defined common cache;

directing that one or more computers making up said defined common cache query, on a scheduled or opportunistic basis, one or more other computers within said defined common cache as to a most recent version of said data file cached in said defined common cache; and

in response to said querying, copying a most recent version of said data file cached in said defined common cache to said one or more computers making said queries.

7. The method of claim 1 wherein said step of caching a copy of a data file entering said defined private network from a source external to said defined private network within said defined common cache further comprises the steps of:

saving a copy of said data file at one or more computers making up said defined common cache;

directing that one or more computers making up said defined common cache query, on a scheduled or opportunistic basis, one or more other computers within said defined common cache as to a most recent version of said data file cached in said defined common cache; and

in response to said querying, saving the location of a most recent version of said data file cached in said defined common cache.

8. The method of claim 1 wherein said step of determining if a copy of said requested specific data file is resident within said defined common cache further comprises the step of:

querying one or more computers within said defined common cache as to whether a copy of said requested specific data file is resident at said one or more computers.

9. The method of claim 1 wherein said step of obtaining a most recent version of said requested specific data file which is resident within said defined common cache further comprises the step of:

in response to said determining step, copying a most recent version of said requested data file to local memory.

10. The method of claim 1 wherein said step of obtaining a most recent version of said requested specific data file which is resident within said defined common cache further comprises the step of:

copying a most recent version of said requested data file to local memory; and

delivering a most recent version of said requested data file to a computer requesting said most recent version.

11. The method of claim 1, further comprising the steps of

copying received version of a most recent version of said requested data file to the local memory of a computer requesting said requested data file;

and

associating within the local memory of a computer requesting said specific data file a network address within said defined common cache where said copied most recent version was obtained with the name of said requested data file.

12. An improved system for accessing a most recent version of a requested data file that has been downloaded into a private network from a source external to said private network, said system comprising:

means for establishing a network of computers as private relative to one or more other networks of computers;

means for specifying one or more computers within said defined private network as defining a common cache;

means for caching within said defined common cache a copy of a first data file entering said defined private network from a source external to said defined private network, and a copy of a second data file entering said defined private network from a source external to said defined private network wherein said second data file is a most recent version of said first data file and has some content different from said first data file;

means, responsive to a request from a computer within said defined private network for a specific data file which originates from a source external to said defined private network, for determining that said requested specific data file corresponds to said first and second data files resident within said defined common cache; and

means, responsive to said determining step, for obtaining a most recent version of said requested specific data file by transmitting the second data file which is resident within said defined common cache.

13. The system of claim 12, further comprising:

means, responsive to said determining step, for obtaining said requested specific data file from a source external to said defined private network if said means for determining indicates that a copy of said requested specific data file is not resident within said common cache.

14. The system of claim 12 wherein said means for establishing a network of computers as private relative to one or more other networks of computers further comprises means for defining a network being served by a public Internet Host as private relative to the public Internet.

15. The system of claim 12 wherein said means for specifying one or more computers within said defined private network as defining a common cache further comprises:

means for defining at least one network gateway server within said private network as said defined common cache.

16. The system of claim 12 wherein means for coaching a copy of a data file entering said defined private network from a source external to said defined private network within s aid defined common cache further comprises:

means for saving a copy of said data file at one or more computers making up said defined common cache.

17. The system of claim 12 wherein said means for caching within said defined common cache a copy of a data file entering said defined private network from a source external to said defined private network further comprises:

means for saving a copy of said data file at one or more computers making up said defined cache;

means for directing that one or more computers making up said defined common cache query, on a scheduled or opportunistic basis, one or more other computers within said defined common cache as to a most recent version of said data file cached in said defined common cache; and

means, responsive to said querying, for copying a most recent version of said data file cached in said defined common cache to said one or more computers making said queries.

18. The system of claim 12 wherein said means for caching a copy of a data file entering said defined private network from a source external to said defined private network within said defined common cache further comprises:

means for saving a copy of said data file at one or more computers making up said defined common cache;

means for directing that one or more computers making up said defined common cache query, on a scheduled or opportunistic basis, one or more other computers within said defined common cache as to a most recent version of said data file cached in said defined common cache; and

means, responsive to said querying, for saving the location of a most recent version of said data file cached in said defined common cache.

19. The system of claim 12 wherein said means for determining if a copy of said requested specific data file is resident within said defined common cache further comprises:

means for querying one or more computers within said defined common cache as to whether a copy of said requested specific data file is resident at said one or more computers.

20. The system of claim 12 wherein said means for obtaining a most recent version of said requested specific data file which is resident within said defined common cache further comprises:

means, responsive to said determining step, for copying a most recent version of said requested data file to local memory.

21. The system of claim 12 wherein said means for obtaining a most recent version of said requested specific data file which is resident within said defined common cache further comprises:

means for copying a most recent version of said requested data file to local memory; and

means for delivering a most recent version of said requested data file to a computer requesting said most recent version.

22. The system of claim 12, further comprising:

means for copying received version of a most recent version of said requested data file to the local memory of a computer requesting said requested data file; and

means for associating within the local memory of a computer requesting said specific data file a network address within said defined common cache where said copied most recent version was obtained with the name of said requested data file.

23. A program product for accessing a most recent version of a requested data file that has been downloaded into a private network from a source external to said private network, said program product comprising:

means for establishing a network of computers as private relative to one or more other networks of computers;

means for specifying one or more computers within said defined private network as defining a common cache;

means for caching within said defined common cache a copy of a first data file entering said defined private network from a source external to said defined private network, and a copy of a second data file entering said defined private network from a source external to said defined private network wherein said second data file is a most recent version of said first data file and has some content different from said first data file;

means, responsive to a request from a computer within said defined private network for a specific data file which originates from a source external to said defined private network, for determining that said requested specific data file corresponds to said first and second data files resident within said defined common cache;

means, responsive to said determining step, for obtaining a most recent version of said requested specific data file by transmitting the second data file which is resident within said defined common cache; and

signal bearing media bearing said means for establishing, specifying, caching, determining, and obtaining.

24. The program product of claim 23 wherein said signal bearing media comprises recordable media.

25. The program product of claim 23 wherein said signal bearing media comprises transmission media.

26. The program product of claim 23, further comprising:

means, responsive to said determining step, for obtaining said requested specific data file from a source external to said defined private network if said means for determining indicates that a copy of said requested specific data file is not resident within said common cache.

27. The program product of claim 23 wherein said means for establishing a network of computers as private relative to one or more other networks of computers further comprises means for defining a network being served by a public Internet Host as private relative to the public Internet.

28. The program product of claim 23 wherein said means for specifying one or more computers within said defined private network as defining a common cache further comprises:

means for defining at least one network gateway server within said private network as said defined common cache.

29. The program product of claim 23 wherein means for caching a copy of a data file entering said defined private network from a source external to said defined private network within said defined common cache further comprises:

means for saving a copy of said data file at one or more computers making up said defined common cache.

30. The program product of claim 23 wherein said means for caching within said defined common cache a copy of a data file entering said defined private network from a source external to said defined private network further comprises:

means for saving a copy of said data file at one or more computers making up said defined common cache;

means for directing that one or more computers making up said defined common cache query, on a scheduled or opportunistic basis, one or more other computers within said defined common cache as to a most recent version of said data file cached in said defined common cache; and

means, responsive to said querying, for copying a most recent version of said data file cached in said defined common cache to said one or more computers making said queries.

31. The program product of claim 23 wherein said means for caching a copy of a data file entering said defined private network from a source external to said defined private network within said defined common cache further comprises:

means for saving a copy of said data file at one or more computers making up said defined common cache;

means for directing that one or more computers making up said defined common cache query, on a scheduled or opportunistic basis, one or more other computers within said defined common cache as to a most recent version of said data file cached in said defined common cache; and

means, responsive to said querying, for saving the location of a most recent version of said data file cached in said defined common cache.

32. The program product of claim 23 wherein said means for determining if a copy of said requested specific data file is resident within said defined common cache further comprises:

means for querying one or more computers within said defined common cache as to whether a copy of said requested specific data file is resident at said one or more computers.

33. The program product of claim 23, wherein said means for obtaining a most recent version of said requested specific data file which is resident within said defined common cache further comprises:

means, responsive to said determining step, for copying a most recent version of said requested data file to local memory.

34. The program product of claim 23 wherein said means for obtaining a most recent version of said requested specific data file which is resident within said defined common cache further comprises:

means for copying a most recent version of said requested data file to local memory; and

means for delivering a most recent version of said requested data file to a computer requesting said most recent version.

35. The program product of claim 23, further comprising:

means for copying received version of a most recent version of said requested data file to the local memory of the computer requesting said requested data file; and

means for associating within the local memory of a computer requesting said specific data file a network address within said defined common cache where said copied most recent version was obtained with the name of said requested data file.