Implementing transactional messaging for C++ clients

 Create a transactional manager

  1. Initialize QAnywhere.

    This step is the same as in non-transactional messaging.

    #include <qa.hpp>
QAManagerFactory *   factory;

factory = QAnywhereFactory_init();
if( factory == NULL ) {
    // Fatal error.
}

  2. Create a transactional manager.

    QATransactionalManager *  mgr;
mgr = factory->createQATransactionalManager( NULL );
if( mgr == NULL ) {
    // Fatal error.
}

    As with non-transactional managers, you can specify a properties file to customize QAnywhere behavior. In this example, no properties file is used.

  3. Initialize the manager.

    if( !mgr->open() ) {
   // Display message using mgr->getLastErrorMsg().
}

You are now ready to send messages. The following procedure sends two messages in a single transaction.

 Send multiple messages in a single transaction

  1. Initialize message objects.

    QATextMessage *  msg_1;
QATextMessage *  msg_2;

  2. Send the messages.

    The following code sends two messages in a single transaction:



    		 
    msg_1 = mgr->createTextMessage();
if( msg_1 != NULL ) {
  msg_2 = mgr->createTextMessage();
  if( msg_2 != NULL ) {
    if( !mgr->putMessage( "jms_1\\queue_name", msg_1 ) ) {
      // Display message using mgr->getLastErrorMsg().
    } else {
      if( !mgr->putMessage( "jms_1\\queue_name", msg_2 ) ) {
        // Display message using mgr->getLastErrorMsg().
      } else {
        mgr->commit();
      }
    }
    mgr->deleteMessage( msg_2 );
  }
  mgr->deleteMessage( msg_1 );
}

    The commit method commits the current transaction and begins a new transaction. This method commits all putMessage() method and getMessage() method invocations.

    Note

    The first transaction begins with the call to open method.

 See also
Copyright © 2012, iAnywhere Solutions, Inc. - SQL Anywhere 12.0.1