International Business Machines Corporation

Paul G Clarke

Michael Horan

Peter Andrew Broadhurst

Jitendra K A Patel

Peter J Johnson

Anthony John O'Dowd

Mark J Campbell

William Anthony Kingston

Mayur Raja

George Black

Robin Miles Drew

Roger Meli

Shilpashree H Rangaswamy

A method, system and article of manufacture are disclosed for selecting a channel instance for connecting a client application with a server application in a multi-channel computer system. In this computer system, when a new channel instance is used to connect one of the client applications with one of the server applications, defined channel instance information is established for the channel instance. The method of this invention comprises the steps of when a new application connection request is made, locking existing channel instance information; and after said locking, scanning through a list of channel instance connections for one of the channel instances that is a candidate channel instance for that new application connection request. The method comprises the further steps of, in response to finding a candidate channel instance, determining whether the candidate channel instance is suitable for the new application connection request.

Efficient selection of a messaging multiplexed channel instance

A method, system and article of manufacture are disclosed for quiescing multiplexed client messaging conversations. The invention uses plural independent mutexes to stop the application sends from both ends of a client/server channel, while allowing unsolicited control flows from the server to client to also be handled and quiesced. Once the channel is quiesced a channel-wide renegotiation, such as SSL secret key reset, can flow. The channel can then restart, again with the possibility of unsolicited server to client flows. The preferred embodiment of the invention provides a number of important advantages. For example, this embodiment allows channel-wide negotiation flows to occur on a multiplexed channel without the need to wait for application conversations to complete. It also allows channel-wide negotiation flows to occur on a multiplexed channel on which unsolicited server to client flows can occur.

Flexible procedure for quiescing multiplexed client

A method, system and article of manufacture are disclosed for selecting a channel instance for connecting a client with a server in a multi-channel instance computer system. In this computer system, when a new channel instance is used for connecting the client with one of the servers, defined channel information is established for the channel instance. The method of this invention comprises the steps of, when a new connection request is made, locking existing channel information; and after said locking, scanning through a list of channel connections for one of the channel instances that is a candidate for said connection request. In response to finding a candidate channel instance, which is in the process of connecting, the connection request is queued against the candidate channel instance. When the candidate channel instance does not complete connecting within a defined or determined time period, a new channel instance is used for the connection request.

Configuration for messaging multiplexed channel instances with varying connection speeds

A method and apparatus for communicating message data between a plurality of subsystems () in the form of distributed resource managers. The subsystems are coupled together through a coupling means () with a shared memory with at least one shared queue () in the shared memory. Access to the shared queue () is available from each of the coupled subsystems and message data can be communicated between the subsystems via the shared queue (). Each subsystem has a long running process () checking the shared queue for messages for that subsystem.

Method and apparatus for communication of message data using shared queues

Method of transferring messages between computer programs across a network

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Hampshire, United Kingdom

Paul G Clarke