Appendix A. Exchange and Queue Declaration Arguments

Ensures that a given binding key is associated with only one queue.

If set to “true”, the exchange is an initial value exchange, which differs from other exchanges in only one way: the last message sent to the exchange is cached, and if a new queue is bound to the exchange, it attempts to route this message to the queue, if the message matches the binding criteria. This allows a new queue to use the last received message as an initial value.

If set to “true”, the exchange inserts a sequence number named “qpid.msg_sequence” into the message headers of each message. The type of this sequence number is int64. The sequence number for the first message routed from the exchange is 1, it is incremented sequentially for each subsequent message. The sequence number is reset to 1 when the qpid broker is restarted.

If the queue message count goes above this size an alert should be sent.

Controls the minimum interval between events in seconds. The default value is 60 seconds.

If the queue size in bytes goes above this size an alert should be sent.

If a queue is configured to be automatically deleted, it will be deleted after the amount of seconds specified here.

Set the number of files in the persistence journal for the queue. Default value is 8.

Set the number of pages in the file (each page is 64KB). Default value is 24.

Flow resume threshold value as a message count.

Flow resume threshold value in bytes.

Flow stop threshold value in bytes.

The maximum byte size of message data that a queue can contain before the action dictated by the policy_type is taken.

The maximum number of messages that a queue can contain before the action dictated by the policy_type is taken.

The number of distinct priority levels recognized by the queue (up to a maximum of 10). The default value is 1 level.