Method and apparatus for proxy replication

A method in a server for handling requests from a plurality of clients in a distributed data processing system, the method comprising:

• generating a challenge to be a proxy server for providing universal plug and play services in the distributed data processing system;
• responsive to a failure to become the proxy server, logging requests from the plurality of clients handled by the proxy server to form a set of logged requests;
• monitoring for a change in status of the server to become the proxy server;
• responsive detecting a change in status, comparing the set of logged requests to a set of processed requests in a shared memory to identify an unprocessed request;
• and
• responsive to identifying an unprocessed request, processing the unprocessed request.

A method in a server for handling requests from a plurality of clients in a distributed data processing system, the method comprising:

• generating a challenge to be a proxy server;
• responsive to a failure to become the proxy server, logging requests from the plurality of clients handled by the proxy server to form a set of logged requests;
• monitoring for a change in status of the server to become the proxy server;
• responsive detecting a change in status, comparing the set of logged requests to a set of processed requests in a shared memory to identify an unprocessed request;
• responsive to identifying an unprocessed request, processing the unprocessed request;
• and
• responsive to processing the unprocessed request, adding unprocessed request to the set of processed requests in the shared memory.

A distributed data processing system for providing universal plug and play services, the distributed data processing system comprising:

• processing means for processing requests, by a primary proxy, using a shared memory in the distributed data processing system;
• detecting means for detecting a challenge from a secondary proxy to the primary proxy;
• determining means for determining whether the secondary proxy has absolute priority over the primary proxy;
• storing means, responsive to the determining of whether the secondary proxy has absolute priority over the primary proxy, for storing a priority of the secondary proxy;
• and
• allowing means, responsive to the secondary proxy having absolute priority over the primary proxy, for allowing the secondary proxy to access the shared memory.

A server for handling requests from a plurality of clients in a distributed data processing system, the server comprising:

• generating means for generating a challenge to be a proxy server for providing universal plug and play services in the distributed data processing system;
• logging means, responsive to a failure to become the proxy server, for logging requests from the plurality of clients handled by the proxy server to form a set of logged requests;
• monitoring means for monitoring for a change in status of the server to become the proxy server;
• comparing means, responsive detecting a change in status, for comparing the set of logged requests to a set of processed requests in a shared memory to identify an unprocessed request;
• and
• processing means, responsive to identifying an unprocessed request, for processing the unprocessed request.

A server for handling requests from a plurality of clients in a distributed data processing system, the server comprising:

• generating means for generating a challenge to be a proxy server;
• logging means, responsive to a failure to become the proxy server, for logging requests from the plurality of clients handled by the proxy server to form a set of logged requests;
• monitoring means for monitoring for a change in status of the server to become the proxy server;
• comparing means, responsive detecting a change in status, for comparing the set of logged requests to a set of processed requests in a shared memory to identify an unprocessed request;
• processing means, responsive to identifying an unprocessed request, for processing the unprocessed request, and adding mean, responsive to processing the unprocessed request, for adding unprocessed request to the set of processed requests in the shared memory.

A computer program product in a computer readable medium for providing universal plug and play services in a distributed data processing system, the computer program product comprising:

• first instructions for processing requests, by a primary proxy, using a shared memory in the distributed data processing system;
• second instructions for detecting a challenge from a secondary proxy to the primary proxy;
• third instructions for determining whether the secondary proxy has absolute priority over the primary proxy;
• fourth instructions, responsive to the determining of whether the secondary proxy has absolute priority over the primary proxy, for storing a priority of the secondary proxy;
• and
• fifth instructions, responsive to the secondary proxy having absolute priority over the primary proxy, for allowing the secondary proxy to access the shared memory.

A computer program product in a computer readable medium for handling requests from a plurality of clients in a distributed data processing system in a server, the computer program product comprising:

• first instructions for generating a challenge to be a proxy server for providing universal plug and play services in the distributed data processing system;
• second instructions, responsive to a failure to become the proxy server, for logging requests from the plurality of clients handled by the proxy server to form a set of logged requests;
• third instructions for monitoring for a change in status of the server to become the proxy server;
• fourth instructions, responsive detecting a change in status, for comparing the set of logged requests to a set of processed requests in a shared memory to identify an unprocessed request;
• and
• fifth instructions, responsive to identifying an unprocessed request, for processing the unprocessed request.