Using WLST to Manage JMS Servers and JMS System Resources
The WebLogic Scripting Tool (WLST) is a command-line scripting interface that you can use to create and manage JMS servers and JMS system resources. See "Using the WebLogic Scripting Tool and WLST Sample Scripts in the WebLogic Scripting Tool.
Understanding System Modules and Subdeployments
A module is described by the jms-system-resource MBean in the config.xml file. Basic components of a jms-system-resource MBean are:
name—Name of the module. target—Server, cluster, or migratable target the module is targeted to. sub-deployment—A mechanism by which JMS module resources (such as queues, topics, and connection factories) are grouped and targeted to a server resource (such as a JMS server instance, WebLogic server instance, or cluster). descriptor-file-name—Path and filename of the system module file.
The JMS resources of a module are located in a module descriptor file that conforms to the weblogic-jmsmd.xml schema. In Figure 6-1, the module is named myModule-jms.xml and it contains JMS resource definitions for a connection factory and a queue. The sub-deployment-name element is used to group and target JMS resources in the myModule-jms.xml file to targets in the config.xml. You have to provide a value for the sub-deployment-name element when using WLST. For more information on subdeployments, see "Targeting JMS Modules and Subdeployment Resources". In Figure 6-1, the sub-deployment-name DeployToJMSServer1is used to group and target the connection factory CConfac and the queue CQueue in the myModule-jms module.
For more information on how to use JMS resources, see "Understanding JMS Resource Configuration in Configuring and Managing WebLogic JMS.
Figure 6-1 Subdeployment Architecture
How to Create JMS Servers and System Resources
Basic tasks you need to perform when creating JMS resources with the WLST are:
- Start an edit session.
- Create a JMS system module that includes JMS system resources, such as queues, topics, and connection factories.
- Create JMS server resources.
After you have established an edit session, use the following steps configure JMS servers and system resources:
- Get the WebLogic Server MBean object for the server you want to configure resources. For example:
servermb=getMBean("Servers/examplesServer")
if servermb is None:
print '@@@ No server MBean found'
- Create your system resource. For example:
jmsMySystemResource = create(myJmsSystemResource,"JMSSystemResource")
- Target your system resource to a WebLogic Server instance. For example:
jmsMySystemResource.addTarget(servermb)
- Get your system resource object. For example:
theJMSResource = jmsMySystemResource.getJMSResource()
- Create resources for the module, such as queues, topics, and connection factories. For example:
connfact1 = theJMSResource.createConnectionFactory(factoryName)
jmsqueue1 = theJMSResource.createQueue(queueName)
- Configure resource attributes. For example:
connfact1.setJNDIName(factoryName)
jmsqueue1.setJNDIName(queueName)
- Create a subdeployment name for system resources . See Understanding System Modules and Subdeployments.For example:
connfact1.setSubDeploymentName('DeployToJMSServer1')
jmsqueue1.setSubDeploymentName('DeployToJMSServer1')
- Create a JMS server. For example:
jmsserver1mb = create(jmsServerName,'JMSServer')
- Target your JMS server to a WebLogic Server instance. For example:
jmsserver1mb.addTarget(servermb)
- Create a subdeployment object using the value you provided for the
sub-deployment-name element. This step groups the system resources in module to a sub-deployment element in the config.xml. For example:
subDep1mb = jmsMySystemResource.createSubDeployment('DeployToJMSServer1')
- Target the subdeployment to a server resource such as a JMS server instance, WebLogic Server instance, or cluster. For example:
subDep1mb.addTarget(jmsserver1mb)
Listing 6-1 WLST Script to Create JMS Resources
"""
This script starts an edit session, creates a JMS Server,
targets the jms server to the server WLST is connected to and creates
a JMS System module with a jms queue and connection factory. The
jms queues and topics are targeted using sub-deployments.
"""
import sys
from java.lang import System
print "@@@ Starting the script ..."
myJmsSystemResource = "CapiQueue-jms"
factoryName = "CConFac"
jmsServerName = "myJMSServer"
queueName = "CQueue"
url = sys.argv[1]
usr = sys.argv[2]
password = sys.argv[3]
connect(usr,password, url)
edit()
startEdit()
//Step 1
servermb=getMBean("Servers/examplesServer")
if servermb is None:
print '@@@ No server MBean found'
else:
//Step 2
jmsMySystemResource = create(myJmsSystemResource,"JMSSystemResource")
//Step 3
jmsMySystemResource.addTarget(servermb)
//Step 4
theJMSResource = jmsMySystemResource.getJMSResource()
//Step 5
connfact1 = theJMSResource.createConnectionFactory(factoryName)
jmsqueue1 = theJMSResource.createQueue(queueName)
//Step 6
connfact1.setJNDIName(factoryName)
jmsqueue1.setJNDIName(queueName)
//Step 7
jmsqueue1.setSubDeploymentName('DeployToJMSServer1')
connfact1.setSubDeploymentName('DeployToJMSServer1')
//Step 8
jmsserver1mb = create(jmsServerName,'JMSServer')
//Step 9
jmsserver1mb.addTarget(servermb)
//Step 10
subDep1mb = jmsMySystemResource.createSubDeployment('DeployToJMSServer1')
//Step 11
subDep1mb.addTarget(jmsserver1mb)
.
.
.
How to Modify and Monitor JMS Servers and JMS Resources
You can modify or monitor JMS objects and attributes by using the appropriate method available from the MBean.
- You can modify JMS objects and attributes using the set, target, untarget, and delete methods.
- You can monitor JMS runtime objects using get methods.
For more information, see Navigating and Editing MBeans in the WebLogic Scripting Tool.
Listing 6-2 WLST Script to Modify JMS Objects
.
.
print '@@@ delete system resource'
jmsMySystemResource = delete("CapiQueue-jms","JMSSystemResource")
print '@@@ delete server'
jmsserver1mb = delete(jmsServerName,'JMSServer')
.
.
.
Best Practices when Using WLST to Configure JMS
This section provides best practices information when using WLST to configure JMS servers and resources:
- Trap for Null MBean objects (such as servers, JMS servers, modules) before trying to manipulate the MBean object.
- Use a meaningful name when providing a subdeployment name. For example, the subdeployment name DeployToJMSServer1 tells you that all subdeployments with this name are deployed to JMSServer1.
- BEA provides sample scripts and utilities to configure WebLogic domain resources using WLST Offline and/or WLST Online. For more information, see the wlst Project Home.
Labels: Weblogic
