Queues:

As mentioned prior to a session may be:

FROM a program or else terminal or queue
TO a program or else terminal or queue

Queues permit buffered transmission between endpoints. Queues are associated (by DC) with endpoints, users and transactions. If a user isn’t logged on or if a process is doing something as well a queue can be used to hold one or more messages thereby freeing the session for further work or for termination.

At a later time the program or else endpoint may poll the queue as well as obtain the message. Queues are actually passive therefore one needs to associate an algorithm with a queue. Usual algorithms are:

a) Allocate N servers for this queue,

b) Schedule a transaction while a message arrives in this queue.

c) Schedule a transaction while N messages appear in the queue.

d) Schedule a transaction at particular intervals.

Additional queues may be declared to be recoverable in which case DC is responsible for reconstructing the queue as well as it's messages if the system crashes or if the message consumer aborts.

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