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SQL Anywhere 10.0.1 » QAnywhere » Writing QAnywhere Client Applications » Sending QAnywhere messages » Implementing transactional messaging

Implementing transactional messaging Next Page

Implementing transactional messaging for .NET clients


To create a transactional manager
  1. Initialize QAnywhere.

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

    using iAnywhere.QAnywhere.Client;
    
  2. Create a QATransactionalManager object.

    For example, to create a default QATransactionalManager object, invoke CreateQATransactionalManager with null as its parameter:

    QAManager mgr;
    mgr = 
      QAManagerFactory.Instance.CreateQATransactionalManager( 
      null );

    See QAManagerFactory class.

    You can alternatively create a QATransactionalManager object that is customized using a properties file. The properties file is specified in the CreateQATransactionalManager method:

    mgr = 
      QAManagerFactory.Instance.CreateQATransactionalManager( 
      "qa_mgr.props" );

    where qa_mgr.props is the name of the properties file that resides on the remote device.

  3. Initialize the QAManager object.

    mgr.Open();

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

To 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();
          }
        }
      }
    }

    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.

  3. See also