Package org.oddjob.jmx

Class JMXServerJob

java.lang.Object
org.oddjob.jmx.JMXServerJob
All Implemented Interfaces:
ArooaSessionAware, JmxServer
public class JMXServerJob extends Object implements ArooaSessionAware, JmxServer
Author:
Rob Gordon

Description

A service which allows a job hierarchy to be monitored and managed remotely using a JMXClientJob.

Security can be added using the environment property. Simple JMX security comes prepackaged as SimpleServerSecurity. Note that the access file is an Oddjob specific access file. Oddjob requires full read/write access because it uses JMX operations and all JMX operation require full read/write access. Oddjob uses a JMX access format file but provides it's own primitive access control on top the JMX layer. Oddjob's access control removes an entire java interface from the client side proxy if any of it's methods are write. One affect of this is that a read only account can't access properties of the remote job with the ${server/remote-job} syntax because this functionality is provided by the same interface (BeanUtils DynaBean) that allows a remote job's properties to be written.

For more information on JMX Security see The JMX Tutorial.

This service will use the Platform MBeanServer if no url property is provided. Creating an unsecured Oddjob server on a private network can be achieved simply by launching Oddjob with a command line such as:

 java -Dcom.sun.management.jmxremote.port=nnnn \
 -Dcom.sun.management.jmxremote.ssl=false \
 -Dcom.sun.management.jmxremote.authenticate=false \
 -jar run-oddjob.jar -f my-config.xml
And then including this service somewhere in the configuration. Note that the properties must be to the left of the -jar, not to the right because the must be available to the JVM before Oddjob starts.

The server.xml Oddjob configration file in Oddjob's top level directory provides a simple Oddjob server that uses an RMI Registry.

More information on Oddjob servers can be found in the User Guide under 'Sharing Jobs on the Network'.

Example

Creating a server using the platform MBean Server. 

<oddjob xmlns:jmx="http://rgordon.co.uk/oddjob/jmx">

  <job>

    <sequential>

      <jobs>

        <jmx:server root="${echo}"/>

        <echo id="echo">Hello from an Oddjob Server!</echo>

      </jobs>

    </sequential>

  </job>

</oddjob>

This is probably the simplest way to launch Oddjob as a server.

Here's an example of the command used to launch it: 

 java -Dcom.sun.management.jmxremote.port=13013 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -jar C:\Users\rob\projects\oddjob\run-oddjob.jar -f C:\Users\rob\projects\oddjob\test\java\org\oddjob\jmx\PlatformMBeanServerExample.xml
For an example of a client to connect to this server see the first example for JMXClientJob.Creating a server using an RMI registry. 

<oddjob id="this">

    <job>

        <sequential>

            <jobs>

                <rmireg/>

                <jmx:server id="server1" root="${server-jobs}" url="service:jmx:rmi://ignored/jndi/rmi://localhost/freds-oddjob-server" xmlns:jmx="http://rgordon.co.uk/oddjob/jmx"/>

                <oddjob file="${this.dir}/ServerJobs.xml" id="server-jobs"/>

            </jobs>

        </sequential>

    </job>

</oddjob>

The nested Oddjob can be any normal Oddjob configuration. Here is the nested Oddjob used in some client examples. The greeting is in a folder because it will only be run from the client. 

<oddjob>

    <job>

        <folder>

            <jobs>

                <echo id="greeting">Hello World</echo>

            </jobs>

        </folder>

    </job>

</oddjob>
Creating a secure server. 

<jmx:server root="${some-job}" url="service:jmx:rmi://ignored/jndi/rmi://localhost/my-oddjob" xmlns:jmx="http://rgordon.co.uk/oddjob/jmx">

    <environment>

        <jmx:server-security>

            <passwordFile>

                <file file="C:\rob\java\jmx_examples\Security\simple\config\password.properties"/>

            </passwordFile>

        </jmx:server-security>

    </environment>

</jmx:server>