Recovery proxy for wireless applications

A recovery proxy that implements proxy-based recovery is described in this paper Proxy-based recovery provides failure recovery for applications on connected handheld devices. This approach enables proxys to monitor clients´ interaction with back end servers and locally maintain a client´s state based on observed messages. The proxy described in this paper provides a general message logging mechanisms as well as an interface for applications to implement their own checkpointing and message analysis mechanisms. When a client moves from one proxy to another a migration protocol described in this paper can be used to efficiently transfer the client´s state and network connections to the new proxy. Experimental results on the proxy´s latency, throughput and client migration overhead are provided.