MonitorStart (OraAQ) Method

Applies To

Description

Starts a monitor thread for dequeuing the messages specified.

Arguments	Description
[in] NotificationHandler	An IDispatch interface containing the callback method (NotifyMe) which should be notified of new messages.
[in] CallbackCtx	Context-specific information that the application wants to pass to NotifyMe. This is passed into NotifyMe whenever a new message satisfying the user-criteria is dequeued.
[in][optional] MsgFilterVal	A byte array containing a value for the message filter. Ignored if MsgFilter is ORAAQ_ANY.
[in][optional] lMesgFilter MsgFilter	An integer constant specifying the selection criteria for messages. Possible values for MsgFilter are: ORAAQ_ANY = 0 - Invoke the callback for any message that arrives on the queue. This is the default value. ORAAQ_CONSUMER = 1 - Invoke the callback when the message intended for the consumer given in the MsgFilterValue is dequeued. ORAAQ_MSGID = 2 - Invoke the callback when message with the identifier specified in MsgFilterValue is dequeued.

Usage

Q.MonitorStart NotificationHandler, CallbackCtx,[MesgFilterVal],[MsgFilter]

Remarks

NotifyMe Is the callback method of the notification object. The syntax of the method is:

Public Sub NotifyMe (ByVal Ctx As Variant, ByVal Msgid As Variant)

Variant	Description
[in] Ctx	Passed into MonitorStart by the application. Context-sensitve information that the application wants to pass in when messages are dequeued.
[in] Msgid	The message Id of the newly dequeued message. Msgid is null when there is an error while monitoring.

By default, the message is passed into NotifyMe in Remove mode. The default dequeue options can be overridden by setting the properties of this instance (OraAQ).

The MonitorStart method returns ORAAQ_SUCCESS or ORAAQ_FAIL.

See Monitoring Messages.