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  • Use ReceiverGBean to specify the information of the current node and port number used for communication.
  • Use DisableMcastInterceptor to disable the multicast cluster configurations.
  • Use ChannelInterceptorGBeans to specify how the static member are chained together as you can see the configurations of StaticMember1Interceptor and StaticMember2Interceptor.
  • Use StaticMemberGBean to specify the information of the second static member and port number used for communication.

To convert this example to a multicast configuration, the DisableMCastInterceptor, StaticMemberInterceptor, and StaticMember definitions need to be removed. Also, the value for the "address" attribute for the TomcatReceiver definition should be changed to "auto".

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titleexcerpt from geronimo-web.xml
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    <cluster>TomcatCluster</cluster>
        <gbean name="TomcatCluster" class="org.apache.geronimo.tomcat.cluster.CatalinaClusterGBean">
            <attribute name="className">org.apache.catalina.ha.tcp.SimpleTcpCluster</attribute>
            <attribute name="initParams"/>
            <reference name="ClusterListenerChain"> 
                    <name>TomcatClusterListenerChain</name>
            </reference>
            <reference name="TomcatValveChain">
                    <name>ReplicationValve</name>  
            </reference>
            <reference name="Channel">
                    <name>TomcatChannel</name>
            </reference>
            <reference name="ClusterManager"> 
                    <name>TomcatClusterManager</name>
            </reference>
        </gbean>

        <gbean name="TomcatClusterListenerChain" class="org.apache.geronimo.tomcat.cluster.ClusterListenerGBean">
            <attribute name="className">org.apache.catalina.ha.session.ClusterSessionListener</attribute>
            <attribute name="initParams"/>
        </gbean>

        <gbean name="ReplicationValve" class="org.apache.geronimo.tomcat.ValveGBean">
            <attribute name="className">org.apache.catalina.ha.tcp.ReplicationValve</attribute>
            <attribute name="initParams">.*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;</attribute>
            <reference name="NextValve">
        			<type>TomcatValve</type>
            	                <name>JvmRouteBinderValve</name>
            </reference>
        </gbean>

        <gbean name="JvmRouteBinderValve" class="org.apache.geronimo.tomcat.ValveGBean">
            <attribute name="className">org.apache.catalina.ha.session.JvmRouteBinderValve</attribute>
            <attribute name="initParams">enabled=true</attribute>
        </gbean>

        <gbean name="TomcatClusterManager" class="org.apache.geronimo.tomcat.cluster.ClusterManagerGBean">
            <attribute name="className">org.apache.catalina.ha.session.DeltaManager</attribute>
            <attribute name="initParams">name=${clusterName}
                                         channelSendOptions=6
                                         expireSessionsOnShutdown=false
                                         notifyListenersOnReplication=true
                                         mapSendOptions=6
            </attribute>
        </gbean>

        <gbean name="TomcatChannel" class="org.apache.geronimo.tomcat.cluster.ChannelGBean">
            <attribute name="className">org.apache.catalina.tribes.group.GroupChannel</attribute>
            <attribute name="initParams"/>
            <reference name="Membership"> 
                    <name>ClusterMembership</name>
            </reference>
            <reference name="Receiver">
                    <name>ClusterReceiver</name>                
            </reference>
            <reference name="Sender">                
                    <name>ClusterSender</name>
            </reference>
            <reference name="ChannelInterceptor">
                    <name>DisableMcastInterceptor</name>                
            </reference>
        </gbean>

        <gbean name="ClusterMembership" class="org.apache.geronimo.tomcat.cluster.MembershipServiceGBean">
            <attribute name="className">org.apache.catalina.tribes.membership.McastService</attribute>
            <attribute name="initParams">address=228.0.0.4
                                         port=45564
                                         frequency=500
                                         dropTime=3000
            </attribute>
        </gbean>

        <gbean name="ClusterReceiver" class="org.apache.geronimo.tomcat.cluster.ReceiverGBean">
            <attribute name="className">org.apache.catalina.tribes.transport.nio.NioReceiver</attribute>
            <attribute name="initParams">address=IPAddress1
                                         port=TCP_port1
                                         selectorTimeout=100
                                         maxThreads=6
            </attribute>
        </gbean>

        <gbean name="ClusterSender" class="org.apache.geronimo.tomcat.cluster.SenderGBean">
            <attribute name="className">org.apache.catalina.tribes.transport.ReplicationTransmitter</attribute>
        </gbean>

        <gbean name="DisableMcastInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
            <attribute name="className">org.apache.geronimo.tomcat.interceptor.DisableMcastInterceptor</attribute>
            <attribute name="initParams"/>
            <reference name="NextInterceptor">
                    <name>TcpPingInterceptor</name>                
            </reference>
        </gbean>

        <gbean name="TcpPingInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
            <attribute name="className">org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor</attribute>
            <attribute name="initParams">Interval=240</attribute>
            <reference name="NextInterceptor">
                    <name>TcpFailureDetector</name>                
            </reference>
        </gbean>

        <gbean name="TcpFailureDetector" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
            <attribute name="className">org.apache.catalina.tribes.group.interceptors.TcpFailureDetector</attribute>
            <attribute name="initParams"/>
            <reference name="NextInterceptor">                
                    <name>StaticMember1Interceptor</name>                
            </reference>
        </gbean>

        <gbean name="StaticMember1Interceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
            <attribute name="className">org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor</attribute>
            <attribute name="initParams"/>
            <reference name="StaticMember">
                    <name>StaticMember2</name>                
            </reference>
            <reference name="NextInterceptor">                
                    <name>MessageDispatch15Interceptor</name> 
            </reference>
        </gbean>

        <gbean name="MessageDispatch15Interceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
            <attribute name="className">org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor</attribute>
            <attribute name="initParams"/>
            <reference name="NextInterceptor">
                    <name>ThroughputInterceptor</name>                
            </reference>
        </gbean>

        <gbean name="ThroughputInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
            <attribute name="className">org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor</attribute>
            <attribute name="initParams"/>
        </gbean>

        <gbean name="StaticMember2" class="org.apache.geronimo.tomcat.cluster.StaticMemberGBean">
            <attribute name="className">org.apache.catalina.tribes.membership.StaticMember</attribute>
            <attribute name="initParams">port=TCP_port2
                                         securePort=-1
                                         host=IPAddress2
                                         domain=test-domain
                                         UniqueId={2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
            </attribute>
        </gbean>
...

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  1. Define all the static members involved in the deployment plan for each node.
  2. Use a reference "NextInterceptor" in interceptor configurations to chain interceptor together as you can see the configurations of DisableMcastInterceptor and TcpPingInterceptor in the sample below. You can control how the client requests are processed by arranging the order of the interceptor chain.
    Code Block
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    titleinterceptor chain
    ...
    <gbean name="DisableMcastInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
     	 <attribute name="className">org.apache.geronimo.tomcat.interceptor.DisableMcastInterceptor</attribute>
     	 <attribute name="initParams"/>
     	 <reference name="NextInterceptor">
     	 <name>TcpPingInterceptor</name>
     	 </reference>
     	 </gbean>
     	 
    <gbean name="TcpPingInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
     	 <attribute name="className">org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor</attribute>
     	 <attribute name="initParams">Interval=240</attribute>
     	 <reference name="NextInterceptor">
     	 <name>TcpFailureDetector</name>
     	 </reference>
     	 </gbean>
    ...
    
  3. Use a reference "NextStaticMember" in the second and subsequent StaticMember definitions, but not the last, to chain multiple static members.
    Code Block
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    titlestatic member chain
    <gbean name="StaticMember2" class="org.apache.geronimo.tomcat.cluster.StaticMemberGBean">
    	  	 <attribute name="className">org.apache.catalina.tribes.membership.StaticMember</attribute>
    	  	 <attribute name="initParams">port=TCP_port2
    	  	 securePort=-1
    	  	 host=IPAddress2
    	  	 domain=test-domain
    	  	 UniqueId={2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
    	  	 </attribute>
    	  	         <reference name="NextStaticMember">
    	 	  	 <name>StaticMember3</name>
    	  	         </reference>
    	  	 </gbean> 
    

See the following deployment plan snippet as an complete example of setting up application-scoped unicast clustering with more than two nodes.

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