Feeds

Programming message services in Java

Asynchronous interactions seem to be the way of the future

Top 5 reasons to deploy VMware with Tegile

Publish destinations

How a destination is published is message service dependent. In the case of the JBossMQ message server a destination can be published by providing an entry in the JBossmq-destinations-service.xml file (found under the \server\default\deploy\jms directory for the default Jboss server configuration). By default a number of queues are already defined and we will use one of these, the queue/testQueue. By contrast, in WebLogic and WebSphere queues can be defined using the application server consoles.

The entry for the JBossmq-destinations-service.xml file for the queue/testQueue is presented below:

  <mbean code="org.jboss.mq.server.jmx.Queue"
         name="jboss.mq.destination:service=Queue,name=testQueue">
    <depends optional-attribute-name="DestinationManager">jboss.mq:service=DestinationManager</depends>
    <depends optional-attribute-name="SecurityManager">jboss.mq:service=SecurityManager</depends>
    <attribute name="MessageCounterHistoryDayLimit">-1</attribute>
    <attribute name="SecurityConf">
      <security>
        <role name="guest" read="true" write="true"/>
        <role name="publisher" read="true" write="true" create="false"/>
        <role name="noacc" read="false" write="false" create="false"/>
      </security>
    </attribute>
  </mbean>

Define a client

To send a message to a JMS message server queue, there are a number of steps that must be performed. These steps are the same whether you wish to send the message from a stand-alone application, from a Servlet or JSP, or indeed from an Enterprise JavaBean. These steps are:

Step 1: Obtain a queue connection factory. A queue connection factory is used to create the queue connection object used to handle the connection to the message servers’ queue.

Step 2: Create a queue connection. This is done by calling the createQueueConnection method on the factory object just obtained.

Step 3: Create a queue session. A queue session is obtained from the queue connection, as illustrated below:

QueueSession qs = 
             qc.createQueueSession(false, 
             Session.AUTO_ACKNOWLEDGE);

The first argument to the createQueueSession method above indicates that this is not part of a transaction. The second argument indicates that the queue session automatically acknowledges messages when they have been received successfully. Until a JMS message has been acknowledged, it is not considered to be successfully consumed.

Step 4: Look up the queue. This is done by using the initial context object we created earlier and looking up the queue using its JNDI name (e.g. queue/testQueue).

Step 5: Create a queue sender. A queue sender is a message producer that allows messages to be sent to the specified queue. A queue sender is created using the createSender method on the queue session:

Step 6: Create the message object.

Step 7: Send the message via the QueueSender object created in step 5.

Step 8: Close the queue connection.

Providing a secure and efficient Helpdesk

More from The Register

next story
Preview redux: Microsoft ships new Windows 10 build with 7,000 changes
Latest bleeding-edge bits borrow Action Center from Windows Phone
Google opens Inbox – email for people too thick to handle email
Print this article out and give it to someone tech-y if you get stuck
Microsoft promises Windows 10 will mean two-factor auth for all
Sneak peek at security features Redmond's baking into new OS
UNIX greybeards threaten Debian fork over systemd plan
'Veteran Unix Admins' fear desktop emphasis is betraying open source
Google+ goes TITSUP. But WHO knew? How long? Anyone ... Hello ...
Wobbly Gmail, Contacts, Calendar on the other hand ...
DEATH by PowerPoint: Microsoft warns of 0-day attack hidden in slides
Might put out patch in update, might chuck it out sooner
Redmond top man Satya Nadella: 'Microsoft LOVES Linux'
Open-source 'love' fairly runneth over at cloud event
prev story

Whitepapers

Cloud and hybrid-cloud data protection for VMware
Learn how quick and easy it is to configure backups and perform restores for VMware environments.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.