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11. Building a JMS Point-to-Point Test Plan
In this section, you will learn how to create a Test Plan to test a JMS Point-to-Point messaging solution. The setup of the test is 1 threadgroup with 5 threads sending 4 messages each through a request queue. A fixed reply queue will be used for monitoring the reply messages. each one to 10 iterations. To construct the Test Plan, you will use the following elements: Thread Group , JMS Point-to-Point , and Graph Results . General notes on JMS. There are currently two JMS samplers. One uses JMS topics and the other uses queues. Topic messages are commonly know as pub/sub messaging. It is generally used in cases where a message is publish by a producer and consumed by multiple subscribers.
11.1 Adding a Thread Group
> The first step you want to do with every JMeter Test Plan is to add a Thread Group element. The Thread Group tells JMeter the number of users you want to simulate, how often the users should send requests, and the how many requests they should send. Go ahead and add the ThreadGroup element by first selecting the Test Plan, clicking your right mouse button to get the Add menu, and then select Add --> ThreadGroup. You should now see the Thread Group element under Test Plan. If you do not see the element, then "expand" the Test Plan tree by clicking on the Test Plan element. Next, you need to modify the default properties. Select the Thread Group element in the tree, if you have not already selected it. You should now see the Thread Group Control Panel in the right section of the JMeter window (see Figure 11.1 below)
> Figure 11.1. Thread Group with Default Values
> Start by providing a more descriptive name for our Thread Group. In the name field, enter Point-to-Point. Next, increase the number of users (called threads) to 5. In the next field, the Ramp-Up Period, leave the the default value of 0 seconds. This property tells JMeter how long to delay between starting each user. For example, if you enter a Ramp-Up Period of 5 seconds, JMeter will finish starting all of your users by the end of the 5 seconds. So, if we have 5 users and a 5 second Ramp-Up Period, then the delay between starting users would be 1 second (5 users / 5 seconds = 1 user per second). If you set the value to 0, then JMeter will immediately start all of your users. Clear the checkbox labeled "Forever", and enter a value of 4 in the Loop Count field. This property tells JMeter how many times to repeat your test. If you enter a loop count value of 0, then JMeter will run your test only once. To have JMeter repeatedly run your Test Plan, select the Forever checkbox.
> In most applications, you have to manually accept changes you make in a Control Panel. However, in JMeter, the Control Panel automatically accepts your changes as you make them. If you change the name of an element, the tree will be updated with the new text after you leave the Control Panel (for example, when selecting another tree element).
11.2 Adding JMS Point-to-Point Sampler
> Make sure the required jar files are in JMeter's lib directory. If they are not, shutdown JMeter, copy the jar files over and restart JMeter. See here for details on ActiveMQ 3.0.
> Start by adding the sampler JMS Point-to-Point to the Jakarta Users element (Add --> Sampler --> JMS Point-to-Point). Then, select the JMS Point-to-Point sampler element in the tree. In building the example a configuration will be provided that works with ActiveMQ 3.0.
> Name | Value | Description
> JMS Resources
> QueueuConnectionFactory | ConnectionFactory | This is the default JNDI entry for the connection factory within active mq.
> JNDI Name Request Queue | Q.REQQ | This is equal to the JNDI name defined in the JNDI properties.
> JNDI Name Reply Queue | Q.RPL | This is equal to the JNDI name defined in the JNDI properties.
> Message Properties
> Communication Style | Request Response | This means that you need at least a service that responds to the requests.
> Content | test | This is just the content of the message.
> JMS Properties |  | Nothing needed for active mq.
> JNDI Properties
> InitialContextFactory | org.activemq.jndi.ActiveMQInitialContextFactory | The standard InitialContextFactory for Active MQ
> Properties
> brokerURL | tcp://localhost:61616 | This defines the url of the active mq messaging system.
> queue.Q.REQ | example.Q.REQ | This defines a JNDI name Q.REQ for the request queue that points to the queue example.Q.REQ.
> queue.Q.RPL | example.Q.RPL | This defines a JNDI name Q.RPL for the reply queue that points to the queue example.Q.RPL.
11.3 Adding a Listener to View Store the Test Results
> The final element you need to add to your Test Plan is a Listener . This element is responsible for storing all of the results of your HTTP requests in a file and presenting a visual model of the data. Select the Jakarta Users element and add a Graph Results listener (Add --> Listener --> Graph Results). Next, you need to specify a directory and filename of the output file. You can either type it into the filename field, or select the Browse button and browse to a directory and then enter a filename.
> Figure 11.2. Graph Results Listener
11.4 Saving the Test Plan
> Although it is not required, we recommend that you save the Test Plan to a file before running it. To save the Test Plan, select Save Test Plan from the File menu (with the latest release, it is no longer necessary to select the Test Plan element first).
> JMeter allows you to save the entire Test Plan tree or only a portion of it. To save only the elements located in a particular "branch" of the Test Plan tree, select the Test Plan element in the tree from which to start the "branch", and then click your right mouse button to access the Save As menu item. Alternatively, select the appropriate Test Plan element and then select Save As from the Edit menu.
11.5 Running the Test Plan
> From the Run menu, select Run.
> JMeter lights up a green square in the upper-right-hand corner to indicate if a test is currently running. The square is turned gray when all tests stop. Even after you select "stop", the green light will stay on until all test threads have exited.
> Once JMeter has finished running your Test Plan, select Stop from the Run menu. If you selected a file to save the results to in your listener, then you will have a file that can be opened in any visualizer. Each visualizer will display the results in it's own fashion.
> It is possible to have the same file open in more than one visualizer. This is not a problem. JMeter will ensure during the test run that no sample is recorded to the same file more than once.
11.6 Libraries for ActiveMQ 3.0
The following libraries have to be supplied in the lib\ext directory of JMeter: activation.jar activeio-1.0-SNAPSHOT.jar activemq-3.0.jar activemq-core-3.0.jar commons-logging-1.0.3.jar concurrent-1.3.4.jar geronimo-spec-j2ee-jacc-1.0-rc4.jar geronimo-spec-j2ee-management-1.0-rc4.jar geronimo-spec-jms-1.1-rc4.jar geronimo-spec-jta-1.0.1B-rc4.jar jms.jar jndi.jar log4j-1.2.8.jar spring-1.1.jar
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Copyright © 1999-2005, Apache Software Foundation | Updated: $Date: 2005/06/18 02:17:26 $