Request interceptor in network nodes for determining local storage of file image satisfying predetermined criteria

• US 6,205,475 B1
• Filed: 08/24/1999
• Issued: 03/20/2001
• Est. Priority Date: 02/26/1997
• Status: Expired due to Fees

• Current Assignee: RPX Corporation
• Original Assignee: Network Caching Technology LLC
• Inventors: Pitts, William Michael
• Primary Examiner(s): Kim, Kenneth S.
• Application Number:
  US09/382,311
• Time in Patent Office: 574 Days
• Field of Search: 709/203, 709/218, 709/217
• US Class Current: 709/218
• CPC Class Codes: G06F 12/0813 with a network or matrix configuration
• CPC Class Codes: G06F 12/0866 for peripheral storage systems, e.g. disk cache
• CPC Class Codes: H04L 67/288 Distributed intermediate devices, i.e. intermediate devices for interaction with other intermediate devices on the same level
• CPC Class Codes: H04L 67/564 Enhancement of application control based on intercepted application data
• CPC Class Codes: H04L 67/565 Conversion or adaptation of application format or content adding application control or application functional data H04L67/561
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 67/5681 Pre-fetching or pre-delivering data based on network characteristics
• CPC Class Codes: H04L 67/5682 Policies or rules for updating, deleting or replacing the stored data
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]

Abstract

A data storage device disposed in a transmission path between a destination node and a data source stores images of files in a memory. The destination node sends data requests to the source via the data transmission path. The storage device includes a data transfer detector that detects transfers of data from the source to the destination node along the data transmission path. A memory manager of the storage device stores only selected ones of the transferred data files in the memory. A data request detector to the storage device detects requests for data passing along the data transmission path. An interceptor of the storage device intercepts and services detected data requests when the requested data has been previously stored in the memory, and the stored requested data file meets predetermined criteria. In this way, the storage device may transfer requested data from the memory to the destination node.

Claims

1. A data storage device for being disposed in a data transmission path between a destination node and a data source, wherein the destination node is operable to request a data file from the data source by directing a request for a data file along the data transmission path, comprising;

a memory for storing one or more of the data files;

a data transfer detector for detecting when data is transferred from the data source to the destination node along the data transmission path;

a memory manager for storing in said memory only selected ones of the data files determined to be transferred from the data source to the destination node; and

a data request detector for detecting a request for a data file from the destination node along the data transmission path;

an interceptor for intercepting said detected data request and for servicing said data request when said requested data file has been previously stored in said memory by said memory manager and said stored requested data file meets predetermined criteria, wherein said requested data file is then transferred from said memory to the requesting destination node.

2. The system of claim 1, wherein data is transmitted to the destination node in response to a request for a data file from the source, said interceptor including:

a comparator device for comparing the detected request for a data file from the destination node with the ones of said data files stored in said storage device; and

a latency device for determining if, in response to said comparator device determining a true comparison, said true comparison one of said data files has been stored in said storage device less than a predetermined length of time, which said predetermined length of time constitutes said predetermined criteria.

3. The system of claim 2, wherein said memory manager is operable to time stamp each of said data files stored in said storage device at the time of storage thereof, and said latency device is operable to compare said time stamp with the time of the received request from the destination node to determine the time difference and then compare the determined time difference with a predetermined time difference and, if less, then defining this as meeting the predetermined criteria.

4. The system of claim 1, wherein data is transmitted to the destination node in response to a request for a data file from the source transmitted thereto along the data transmission path, and further comprising a traffic manager, said traffic manager including:

a request receiver for receiving each of the requests transmitted for reception to the source along the data transmission path;

a request transmitter for transmitting the received request from the destination node to the source as a request of the source to transfer the requested data file to the intermediate node;

a data file receiver for receiving requested ones of said data files from the source; and

a relay transmitter for relaying the received one of said data files to the corresponding requesting destination node after receipt thereof.

5. The system of claim 4, wherein said interceptor is operable to make said determination if a received one of said data files to be transferred to the destination node from the source corresponds to one said data files which has been stored in said storage device meeting said predetermined criteria and inhibit said request transmitter from transmitting a request to the source if a positive determination has been made.

6. The system of claim 1, wherein said predetermined criteria comprises temporal criteria.

7. The system of claim 1, wherein said memory manager is operable to store all of the information transferred from the source to the destination node in said memory in association with tagging information correlating with said predetermined criteria.

8. An image file storage device for being disposed in a data transmission path between a destination node and a plurality of image file sources, wherein the destination node is operable to request an image file from a select one of the image file sources by directing a request for an image file along the data transmission path to the select one of the sources, comprising;

a memory for storing one or more of the image files;

an image file detector for detecting when an image file is transferred from one of the image file sources to the destination node along the data transmission path;

a memory manager for storing in said memory only selected ones of the image files determined to be transferred from the data source to the destination node;

a data request detector for detecting a request for an image file from the destination node along the data transmission path; and

an interceptor for intercepting said detected image file request and for servicing said image file request when said requested image file has been previously stored in said memory by said memory manager and said stored requested image file meets predetermined criteria, wherein said requested image file is then transferred from said memory to the requesting destination node.

9. A data storage device for being disposed in a data transmission path between a destination node and a data source, wherein the destination node is operable to request data from the data source by directing a request for data along the data transmission path from the data source, comprising;

a memory for storing data from one or more of the data requests from the destination node;

a data transfer detector for detecting when data is transferred from the data source to the destination node along the data communications path;

a memory manager for storing in said memory only data associated with selected ones of the data requests determined to be transferred from the data source to the destination node, and only storing the data transferred from the source to the destination node;

a data request detector for detecting a request for data from the destination node along the data transmission path;

an interceptor for intercepting said detected data request and for servicing said data request when said requested data has been previously stored in said memory by said memory manager and said stored requested data meets predetermined criteria, wherein said requested data fie is then transferred from said memory to the requesting destination node.

10. A data storage device for being disposed in a data transmission path between a destination node and a data source, wherein the destination node is operable to request a data file from the data source by directing a request for a data file along the data transmission path, comprising;

a memory for storing one or more of the data files;

a data transfer detector for detecting when data is transferred from the data source to the destination node along the data transmission path, said data transfer device receiving command information from the data source for selected ones of the transferred data files;

a memory manager for storing in said memory only selected ones of the data files determined to be transferred from the data source to the destination node, said selected ones of said data files determined in response to said detected associated command information;

a data request detector for detecting a request for a data file from the destination node along the data transmission path; and

an interceptor for intercepting said detected data request and for servicing said data request when said requested data file has been previously stored in said memory by said memory manager as valid data which data is then transferred from said memory to the requesting destination node.