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Message Queuing is a communications service that provides asynchronous and reliable message passing between client applications running on different hosts. In Message Queuing, clients send application messages to a queue and/or consume application messages from a queue. The queue provides persistence of the messages, thereby enabling them to survive across application restarts and allowing the sending and receiving client applications to operate asynchronously from each other.
Queues are hosted by a communications service called a queue manager.
Implementing the queue manager as a separate service allows client applications to exchange queued messages asynchronously and eliminates the need for the client applications to execute at the same time.
Message Queuing is designed for the possibility of sending messages asynchronously to computers that are temporarily unavailable. When sending a message, the queue manager indicates to the client application that the sending operation has succeeded as soon as the message is created with valid properties and is placed in an outgoing queue, where the message remains until it is delivered to its destination or the message expires. Note that the sending operation does not immediately deliver the message but just stores it in a queue to be delivered asynchronously by the queue manager.
Queue managers handle the delivery of messages by continually checking for messages in all the local outgoing queues and attempting to transmit the found messages to their destinations. The queue manager on the sending side does not return any information to the sending application if the message does not reach its destination queue or if the message is discarded before being retrieved by a receiving application. Applications can obtain information from acknowledgment messages sent back from the destination host and can also examine the dead letter and journal queues for information on messages sent.
The Message Queuing (MSMQ): Message Queuing Binary Protocol defines a mechanism for reliably transferring messages between queue managers that are located on two different hosts. The protocol does not define the queue manager or its interface to client applications.