format of event messages, structure of event messages, data, WebSphere MQ messages, header, message" /> Event message format

 

Event message format

Event messages are standard WebSphere MQ messages containing a message descriptor and message data.

Table 14 shows the basic structure of these messages, and the names of the fields in an event message for queue service interval events.

Table 14. Event message structure for queue service interval events
Message descriptor
Message data
MQMD structure
PCF header
MQCFH structure
Event data 1
 
Structure identifier
Structure version
Report options
Message type
Expiration time
Feedback code
Encoding
Coded character set ID
Message format
Message priority
Persistence
Message identifier
Correlation identifier
Backout count
Reply-to queue
Reply-to queue manager
User identifier
Accounting token
Application identity data
Application type
Application name
Put date
Put time
Application origin data
Group identifier
Message sequence number
Offset
Message flags
Original length
 
 
Structure type
Structure length
Structure version
Command identifier
Message sequence number
Control options
Completion code
Reason code
Parameter count
 
 
Queue manager name
Queue name
Time since last reset
Maximum number of
  messages on queue
Number of messages
  put to queue
Number of messages
  retrieved from queue
 
Notes:

  1. The parameters shown are those returned for a queue service interval event. The actual event data depends on the specific event.

In general, we need only a subset of this information for any system management programs that you write. For example, your application might need the following data: