Advanced Queuing - Oracle

Converting Messages
Advanced Queuing Header Properties
Table 18–2 defines the Messaging Gateway {name,value} pairs used to describe the
AQ message properties. The header property names for the AQ properties are
prefixed with "MGW_AQ_".
When a message is dequeued from an AQ queue, the AQ driver generates
{name,value} pairs based on the dequeued message header. When a message is
enqueued, the AQ driver sets the AQ message properties from {name,value} pairs
for these properties.
Table 18–2 Messaging Gateway Names for AQ Message Properties
MGW Name
MGW_NAME_VALUE_T.name
MGW Type
MGW_NAME_VALUE_T.type AQ Message Property Used For
"MGW_AQ_priority" INTEGER_VALUE priority Enqueue
Dequeue
"MGW_AQ_expiration" INTEGER_VALUE expiration Enqueue
Dequeue
"MGW_AQ_delay" INTEGER_VALUE delay Enqueue
Dequeue
"MGW_AQ_correlation" TEXT_VALUE (size 128) correlation Enqueue
Dequeue
"MGW_AQ_exception_queue" TEXT_VALUE (size 61) exception_queue Enqueue
Dequeue
"MGW_AQ_enqueue_time" DATE_VALUE enqueue_time Dequeue
"MGW_AQ_original_msgid" RAW_VALUE (size 16) original_msgid Dequeue
When a message is enqueued to an AQ queue, the AQ driver sets the default values
for the AQ message properties that have no default mappings (refer to Table 18–1).
Corresponding header properties are set as shown in Table 18–3.
Table 18–3 AQ Message Property Default Values
AQ Message Property Name Default Value
priority 1
expiration NEVER
Messaging Gateway 18-35