Special FIFO Mode Properties
Figure 1–20 Special FIFO Modes Properties Panel
As described in Message Delivery Order, the JMS IQ Manager allows three different FIFO delivery modes: fully concurrent, protected concurrent, or fully serialized. By default, all message destinations use the fully concurrent delivery mode. For more information, see Figure 1–5.
In fully concurrent mode, receivers can retrieve messages from a destination only when all other messages have been received or are in the process of being received. Receivers can then commit messages without restrictions. As a result, messages can be committed out of sequence, which is not always desirable.
In the Special FIFO Modes panel, you can specify alternate properties for delivery order, as described in the following sections:
Fully Serialized Queues
The Fully Serialized Queues property specifies which queues are fully serialized. In fully serialized mode, receivers can only retrieve messages after all previous messages for the message destination have been received and committed.
To implement serialized mode across multiple application servers, you must set the JMS clients for the consumers involved to serial mode. For more information, refer to Concurrency.
Allowed Values
A list of existing queue names.
Protected Concurrent Queues
The Fully Concurrent Queues property specifies which queues use protected concurrent FIFO delivery mode. In protected concurrent mode, a receiver can retrieve messages just as in fully concurrent mode (only after all messages have been received or are being received), but messages can only be committed if all previous messages have been committed.
Allowed Values
A list of existing queue names.
FIFO Expiration Time
The FIFO Expiration Time property specifies the maximum amount of time to delay a commit request in special FIFO mode.
Default Value
The default FIFO mode expiration time is 604800 seconds (168 hours).
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