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What Is Queue-based Communication
The BEA Tuxedo system offers a queue-based architecture known as /Q for applications that require persistent storage of data. The /Q component allows any client or server to store messages or service requests in queues and guarantees that any stored request is sent through the transaction protocol to ensure safe storage.
BEA Tuxedo system queues can be ordered as Last In First Out (LIFO) or First In First Out (FIFO), or on the basis of time or priority. A collection of queues is administered and referred to as a single entity known as a queue space.
Queue-based Messaging
Application queues are appropriate if you must communicate in a time-independent fashion. Time-independence is a characteristic of programs that operate independently from one another and do not need to synchronize their communications simultaneously. Time-independent programs synchronize by leaving messages for each other in application queues. Messages can be dequeued in any of several ordering schemes, such as first-in, first-out (FIFO) order, priority order, or time-based order. BEA Tuxedo client and server programs can enqueue messages and dequeue messages from queues. More than one client and server can access the same queue.
To use an application queue, your program must name the queue to be accessed and the queue space in which it resides. Your application can use more than one queue space and each space can contain more than one message queue.
Because application queues reside on a disk, the availability of stored messages is guaranteed even after machine failures. To determine when the use of application queues is appropriate, you need to determine when time-independent synchronization occurs in your business, for example, in filling orders. Orders can be enqueued to disk and depending on specific order criteria, such as items or shipment location, placed in different queue spaces. Within each queue space, you can determine additional criteria, such as cost, state, and so on.
See Also
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