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Method, apparatus and program products are provided for persistent cache synchronization for a first communication session and a concurrent second communication session over an external communication link between a client protocol conversion application executing on a first computer and a server pro

Method, apparatus and program products are provided for persistent cache synchronization for a first communication session and a concurrent second communication session over an external communication link between a client protocol conversion application executing on a first computer and a server protocol conversion application executing on a second computer located remote from the first computer. An active cache is established independently for each session with a corresponding cache for each session at the other computer for use with the first and the second communication session respectively. A checkpoint request is transmitted to the server application indicating one of the active protocol caches from either the first session or the second session to be used to provide a checkpoint. On receipts of the request from the server application, the active protocol cache for the indicated session is copied to provide a checkpoint cache of the second computer. Regardless of which session was indicated, the resulting checkpoint cache of the second computer is associated with both the first and the second session. A checkpoint confirmation message is transmitted to the client application with the first computer responsive to the copying operation. On receipt of the checkpoint confirmation message, the client application creates a checkpoint cache of the first computer as a copy of the indicated one of the first or second sessions protocol cache. The checkpoint cache of the first computer is associated with both the first session and the second session to provide a checkpoint. Operations to create new checkpoints are repeated as desired based upon checkpoint criteria.

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1. A method of persistent cache synchronization for a first communication session and a concurrent second communication session over an external communication link between an application executing on a first computer and an application executing on a second computer located remote from the first com

1. A method of persistent cache synchronization for a first communication session and a concurrent second communication session over an external communication link between an application executing on a first computer and an application executing on a second computer located remote from the first computer, the method comprising the steps of:establishing a first cache operatively associated with the first session at the first computer and a corresponding second cache operatively associated with the first session at the second computer; establishing a third cache operatively associated with the second session at the first computer and a corresponding fourth cache operatively associated with the second session at the second computer; transmitting a checkpoint request to the second computer indicating one of the first or the third cache to be used to provide a checkpoint; receiving the checkpoint request at the second computer; copying the second cache responsive to the received checkpoint request if the checkpoint request indicates the first cache to provide a checkpoint cache of the second computer; copying the fourth cache responsive to the received checkpoint request if the checkpoint request indicates the third cache to provide a checkpoint cache of the second computer; associating the checkpoint cache of the second computer with both the first and the second session; transmitting a checkpoint confirmation message to the first computer responsive to said step of copying the second cache and said step of copying the fourth cache; receiving the checkpoint confirmation message at the first computer; creating a checkpoint cache of the first computer as a copy of the indicated one of the first or the third cache responsive to the received checkpoint confirmation message; associating the checkpoint cache of the first computer with both the first session and the second session to provide a checkpoint; and then repeating said steps of transmitting a checkpoint request, receiving the checkpoint request, copying the second cache, copying the fourth cache, associating the checkpoint cache of the second computer, transmitting a checkpoint confirmation message, receiving the checkpoint confirmation message, creating, and associating the checkpoint cache of the first computer to provide a new checkpoint.