Efficient transfer of messages using reliable messaging protocols for web services

At computing system within a Web Services (WS) environment, a computer program product for implementing a method of efficiently transferring messages between endpoints in accordance with a Reliable Messaging of WS (RM-WS) protocol by dynamically determining a message window size for sending the messages based on an acceptor's available buffer size, the computer program product comprising one or more computer readable media having stored thereon computer executable instructions that, when executed by a processor, can cause the messaging system to perform the following:

• establish, at an application layer, a sequence session between an initiator and an acceptor in accordance with a RM-WS protocol;
• receive over the sequence session a message that includes acceptor buffer size information, which indicates an amount of available memory for buffering messages that are awaiting processing by an application;
• identify a number of in flight, messages that have been sent to the acceptor without receiving corresponding acknowledgements in accordance with the RM-WS protocol;
• and
• use the acceptor buffer size information and the number of in flight messages to calculate a message window size, which represents an upper limit on a number of messages that can be sent to the acceptor in order to prevent resending messages due to buffer overrun.

At a computing system in a Web Services (WS) environment, a computer program product for implementing a method of controlling network congestion by adjusting a transmission window for sending messages to an endpoint in accordance with a Reliable Messaging of WS (RM-WS) protocol in order to adapt to such things as changes in network bandwidth, performance and topology, the computer program product comprising one or more computer readable media having stored thereon computer executable instructions that, when executed by a processor, can cause the messaging system to perform the following:

• send, to an acceptor over an established sequence session in accordance with a RM-WS protocol, a number of messages corresponding to a message window size, wherein the message window size represents an upper limit on a number of in flight messages to send to the acceptor on a network wire;
• based on the message window size, identify an expected message transfer time, which defines an expected time limit between sending the number of messages and receiving one or more corresponding acknowledgment messages;
• provide an indication as to whether or not the one or more corresponding acknowledgment messages were received before the expected message transfer time expires, the indication for use in adjusting at least one of the message window size or a retry time period in order to prevent resending messages due to network congestion.