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https://issues.apache.org/jira/browse/ACTIVEMQ6-3 We are renaming packages from activemq6 to activemq as that's more generic and version independent The previous commit renamed the directories. On this commit now I'm changing the code. If we changed the code and the directories on the same commit git would remove and add a lot of files without recognizing the renames.
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<title>HornetQ Asynchronous Send Acknowledgements Example</title>
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<h1>Asynchronous Send Acknowledgements Example</h1>
<p>Asynchronous Send Acknowledgements are an advanced feature of HornetQ which allow you to
receive acknowledgements that messages were successfully received at the server in a separate thread to the sending thread<p/>
<p>In this example we create a normal JMS session, then set a SendAcknowledgementHandler on the JMS
session's underlying core session. We send many messages to the server without blocking and asynchronously
receive send acknowledgements via the SendAcknowledgementHandler.
<p>For more information on Asynchronous Send Acknowledgements please see the user manual</p>
<h2>Example step-by-step</h2>
<p><i>To run the example, simply type <code>mvn verify</code> from this directory</i></p>
<ol>
<li>First we need to get an initial context so we can look-up the JMS connection factory and destination objects from JNDI. This initial context will get it's properties from the <code>client-jndi.properties</code> file in the directory <code>../common/config</code></li>
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<code>InitialContext initialContext = getContext();</code>
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<li>We look-up the JMS queue object from JNDI</li>
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<code>Queue queue = (Queue) initialContext.lookup("/queue/exampleQueue");</code>
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<li>We look-up the JMS connection factory object from JNDI</li>
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<code>ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");</code>
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<li>We create a JMS connection</li>
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<code>connection = cf.createConnection();</code>
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<li>Define a SendAcknowledgementHandler which will receive asynchronous acknowledgements</li>
<pre class="prettyprint">
<code>
class MySendAcknowledgementsHandler implements SendAcknowledgementHandler
{
int count = 0;
public void sendAcknowledged(final Message message)
{
System.out.println("Received send acknowledgement for message " + count++);
}
}
</code>
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<li>Create a JMS session</li>
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<code>Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);</code>
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<li>Set the handler on the underlying core session</li>
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<code>
ClientSession coreSession = ((HornetQSession)session).getCoreSession();
coreSession.setSendAcknowledgementHandler(new MySendAcknowledgementsHandler());
</code>
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<li>Create a JMS Message Producer</li>
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<code>
MessageProducer producer = session.createProducer(queue);
producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
</code>
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<li>Send 5000 messages, the handler will get called asynchronously some time later after the messages are sent.</li>
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<code>
final int numMessages = 5000;
for (int i = 0; i < numMessages; i++)
{
javax.jms.Message jmsMessage = session.createMessage();
producer.send(jmsMessage);
System.out.println("Sent message " + i);
}
</code>
</pre>
<li>And finally, <b>always</b> remember to close your JMS connections and resources after use, in a <code>finally</code> block. Closing a JMS connection will automatically close all of its sessions, consumers, producer and browser objects</li>
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<code>finally
{
if (initialContext != null)
{
initialContext.close();
}
if (connection != null)
{
connection.close();
}
}</code>
</pre>
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