2015-01-05 07:45:36 -05:00
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
2014-10-31 06:20:28 -04:00
< html >
< head >
2014-11-19 03:44:57 -05:00
< title > ActiveMQ JMS HTTP Transport Example< / title >
2014-10-31 06:20:28 -04:00
< link rel = "stylesheet" type = "text/css" href = "../common/common.css" / >
< link rel = "stylesheet" type = "text/css" href = "../common/prettify.css" / >
< script type = "text/javascript" src = "../common/prettify.js" > < / script >
< / head >
< body onload = "prettyPrint()" >
< h1 > JMS HTTP Example< / h1 >
2014-11-19 03:44:57 -05:00
< p > This example shows you how to configure ActiveMQ to use the HTTP protocol as its transport layer.< / p >
2014-10-31 06:20:28 -04:00
2014-11-19 03:44:57 -05:00
< p > ActiveMQ supports a variety of network protocols to be its underlying transport without any specific code change.< / p >
2014-10-31 06:20:28 -04:00
2014-11-19 03:44:57 -05:00
< p > This example is taken from the queue example without any code change. By changing the configuration file, one can get ActiveMQ working with HTTP transport.< / p >
2014-11-19 14:58:44 -05:00
< p > All you need to do is open the server0/activemq-configuration.xml and enable HTTP like the following< / p >
2014-10-31 06:20:28 -04:00
< pre class = "prettyprint" >
< code >
2015-02-23 04:50:08 -05:00
< connector name=" netty-connector" > tcp://localhost:8080?httpEnabled=true< /connector>
2014-10-31 06:20:28 -04:00
< !-- Acceptors -->
2015-02-23 04:50:08 -05:00
< acceptor name=" netty-acceptor" > tcp://localhost:8080 < /acceptor>
2014-10-31 06:20:28 -04:00
< / code >
< / pre >
< 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 >
< pre class = "prettyprint" >
< code > InitialContext initialContext = getContext();< / code >
< / pre >
< li > We look-up the JMS queue object from JNDI< / li >
< pre class = "prettyprint" >
< code > Queue queue = (Queue) initialContext.lookup("/queue/exampleQueue");< / code >
< / pre >
< li > We look-up the JMS connection factory object from JNDI< / li >
< pre class = "prettyprint" >
< code > ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");< / code >
< / pre >
< li > We create a JMS connection< / li >
< pre class = "prettyprint" >
< code > connection = cf.createConnection();< / code >
< / pre >
< li > We create a JMS session. The session is created as non transacted and will auto acknowledge messages.< / li >
< pre class = "prettyprint" >
< code > Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);< / code >
< / pre >
< li > We create a JMS message producer on the session. This will be used to send the messages.< / li >
< pre class = "prettyprint" >
< code > MessageProducer messageProducer = session.createProducer(topic);< / code >
< / pre >
< li > We create a JMS text message that we are going to send.< / li >
< pre class = "prettyprint" >
< code > TextMessage message = session.createTextMessage("This is a text message");< / code >
< / pre >
< li > We send message to the queue< / li >
< pre class = "prettyprint" >
< code > messageProducer.send(message);< / code >
< / pre >
< li > We create a JMS Message Consumer to receive the message.< / li >
< pre class = "prettyprint" >
< code > MessageConsumer messageConsumer = session.createConsumer(queue);< / code >
< / pre >
< li > We start the connection. In order for delivery to occur on any consumers or subscribers on a connection, the connection must be started< / li >
< pre class = "prettyprint" >
< code > connection.start();< / code >
< / pre >
< li > The message arrives at the consumer. In this case we use a timeout of 5000 milliseconds but we could use a blocking 'receive()'< / li >
< pre class = "prettyprint" >
< code > TextMessage messageReceived = (TextMessage) messageConsumer.receive(5000);< / 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 >
< pre class = "prettyprint" >
< code > finally
{
if (initialContext != null)
{
initialContext.close();
}
if (connection != null)
{
connection.close();
}
}< / code >
< / pre >
< / ol >
< / body >
< / html >
