30.2.3. The HA HttpInvoker - Clustered RMI/HTTP Transport
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30.2.3. The HA HttpInvoker - Clustered RMI/HTTP Transport
The RMI/HTTP layer allows for software load balancing of the invocations in a clustered environment. An HA capable extension of the HTTP invoker has been added that borrows much of its functionality from the HA-RMI/JRMP clustering.
To enable HA-RMI/HTTP you need to configure the invokers for the EJB container. This is done through either a jboss.xml descriptor, or the standardjboss.xml descriptor. Example 30.3, “A jboss.xml stateless session configuration for HA-RMI/HTTP” shows is an example of a stateless session configuration taken from the org.jboss.test.hello testsuite package.
Example 30.3. A jboss.xml stateless session configuration for HA-RMI/HTTP
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The stateless-httpHA-invoker invoker-proxy-binding references the jboss:service=invoker,type=httpHA invoker service. This service would be configured as shown below.
<mbean code="org.jboss.invocation.http.server.HttpInvokerHA"
name="jboss:service=invoker,type=httpHA">
<!-- Use a URL of the form
http://<hostname>:8080/invoker/EJBInvokerHAServlet
where <hostname> is InetAddress.getHostname value on which the server
is running.
-->
<attribute name="InvokerURLPrefix">http://</attribute>
<attribute name="InvokerURLSuffix">:8080/invoker/EJBInvokerHAServlet</attribute>
<attribute name="UseHostName">true</attribute>
</mbean>
<mbean code="org.jboss.invocation.http.server.HttpInvokerHA"
name="jboss:service=invoker,type=httpHA">
<!-- Use a URL of the form
http://<hostname>:8080/invoker/EJBInvokerHAServlet
where <hostname> is InetAddress.getHostname value on which the server
is running.
-->
<attribute name="InvokerURLPrefix">http://</attribute>
<attribute name="InvokerURLSuffix">:8080/invoker/EJBInvokerHAServlet</attribute>
<attribute name="UseHostName">true</attribute>
</mbean>
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The URL used by the invoker proxy is the EJBInvokerHAServlet mapping as deployed on the cluster node. The HttpInvokerHA instances across the cluster form a collection of candidate http URLs that are made available to the client side proxy for failover and/or load balancing.
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