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<chapter id="java.AS7config">
  <title id="java.AS7config.title">AS7 modcluster subsystem Configuration</title>
  
  <section id="ModClusterSubSystem">
    <title>ModCluster Subsystem in JBoss AS7</title>
    <para>The mod_cluster integration is done via the modcluster subsystem. In AS7 only 1.1.x is supported.
          Addition HA is not supported in AS version 7.0.x but in it will be in version 7.1.x and after.
    </para>
  </section>
  <section id="ModClusterSubSystemMiniConfiguration">
    <title>ModCluster Subsystem minimal configuration</title>
    <para>The minimal configuration is having the modcluster <code>schemaLocation</code> in the <code>schemaLocation</code> list:
    <programlisting>urn:jboss:domain:modcluster:1.0 jboss-mod-cluster.xsd</programlisting>
    and the <code>extension module</code> in the <code>extensions</code> list:
    <programlisting>&lt;extension module="org.jboss.as.modcluster"/&gt;</programlisting>
    and <code>subsystem</code> declaration like:
    <programlisting>&lt;subsystem xmlns="urn:jboss:domain:modcluster:1.0"/&gt;</programlisting>
    With that configuration modcluster will listen for advertise on <code>224.0.1.105:23364</code> use the <code>simple-load-provider</code> with
    a load factor of 1.
    </para>
   </section>
  <section id="ModClusterSubSystemConfiguration">
    <title>ModCluster Subsystem configuration</title>
    <section id="AS7ModClusterConfig">
       <title>mod-cluster-config Attributes</title> 
       <para>The attributs correspond to the <link linkend="java.properties">properties</link>
       </para>
       <para>Proxy Discovery Configuration</para>
     <informaltable frame="all">
     <tgroup cols="3">
        <thead>
          <row>
            <entry>Attribute</entry>
            <entry>Property</entry>
            <entry>Default</entry>
           </row>
        </thead>
        <tbody>
          <row>
            <entry>proxy-list</entry>
            <entry>proxyList</entry>
            <entry><emphasis>None</emphasis></entry>
          </row>
          <row>
            <entry>proxy-url</entry>
            <entry>proxyURL</entry>
            <entry><emphasis>None</emphasis></entry>
          </row>
          <row>
            <entry>advertise</entry>
            <entry>advertise</entry>
            <entry><emphasis>true</emphasis></entry>
          </row>
          <row>
            <entry>advertise-security-key</entry>
            <entry>advertiseSecurityKey</entry>
            <entry><emphasis>None</emphasis></entry>
          </row>
          <row>
            <entry>excluded-contexts</entry>
            <entry>excludedContexts</entry>
            <entry><emphasis>None</emphasis></entry>
          </row>
          <row>
            <entry>auto-enable-contexts</entry>
            <entry>autoEnableContexts</entry>
            <entry><emphasis>true</emphasis></entry>
          </row>
          <row>
            <entry>stop-context-timeout</entry>
            <entry>stopContextTimeout</entry>
            <entry><emphasis>10 seconds (in seconds)</emphasis></entry>
          </row>
          <row>
            <entry>socket-timeout</entry>
            <entry>nodeTimeout</entry>
            <entry><emphasis>20 seconds (in milli seconds)</emphasis></entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>
    <para>Proxy Configuration</para>
    <informaltable frame="all">
     <tgroup cols="3">
        <thead>
          <row>
            <entry>Attribute</entry>
            <entry>Property</entry>
            <entry>Default</entry>
           </row>
        </thead>
        <tbody>
          <row>
            <entry>sticky-session</entry>
            <entry>stickySession</entry>
            <entry><emphasis>true</emphasis></entry>
          </row>
          <row>
            <entry>sticky-session-remove</entry>
            <entry>stickySessionRemove</entry>
            <entry><emphasis>false</emphasis></entry>
          </row>
          <row>
            <entry>sticky-session-force</entry>
            <entry>stickySessionForce</entry>
            <entry><emphasis>true</emphasis></entry>
          </row>
          <row>
            <entry>node-timeout</entry>
            <entry>workerTimeout</entry>
            <entry><emphasis>-1</emphasis></entry>
          </row>
          <row>
            <entry>max-attempts</entry>
            <entry>maxAttempts</entry>
            <entry><emphasis>1</emphasis></entry>
          </row>
          <row>
            <entry>flush-packets</entry>
            <entry>flushPackets</entry>
            <entry><emphasis>false</emphasis></entry>
          </row>
          <row>
            <entry>flush-wait</entry>
            <entry>flushWait</entry>
            <entry><emphasis>-1</emphasis></entry>
          </row>
          <row>
            <entry>ping</entry>
            <entry>ping</entry>
            <entry><emphasis>10</emphasis></entry>
          </row>
          <row>
            <entry>smax</entry>
            <entry>smax</entry>
            <entry><emphasis>-1</emphasis> it uses default value</entry>
          </row>
          <row>
            <entry>ttl</entry>
            <entry>ttl</entry>
            <entry><emphasis>-1</emphasis> it uses default value</entry>
          </row>
          <row>
            <entry>domain</entry>
            <entry>loadBalancingGroup</entry>
            <entry><emphasis>None</emphasis></entry>
          </row>
          <row>
            <entry>load-balancing-group</entry>
            <entry>loadBalancingGroup</entry>
            <entry><emphasis>None</emphasis></entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>
    <para>SSL Configuration</para>
    <para>SSL configuration part needs to be added here too</para>

    </section>
    <section id="SimpleLoadProvider">
     <title>simple-load-provider Attributes</title>
     <para>The simple load provider always send the same load factor. That is the default one. Example:</para>
     <programlisting>
&lt;subsystem xmlns="urn:jboss:domain:modcluster:1.0"&gt;
  &lt;mod-cluster-config&gt;
    &lt;simple-load-provider load="1"/&gt;
  &lt;/mod-cluster-config&gt;
&lt;/subsystem&gt;
     </programlisting>
     
     <informaltable frame="all">
     <tgroup cols="3">
        <thead>
          <row>
            <entry>Attribute</entry>
            <entry>Property</entry>
            <entry>Default</entry>
           </row>
        </thead>
        <tbody>
          <row>
            <entry>factor</entry>
            <entry>LoadBalancerFactor</entry>
            <entry><emphasis>1</emphasis></entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>
    </section>
    <section id="DynamicLoadProvider">
       <title>dynamic-load-provider Attributes</title>
       <para>The dynamic load provide allows to have <code>load-metric</code> as well as <code>custom-load-metric</code> defined. For example:</para>
     <programlisting>
&lt;subsystem xmlns="urn:jboss:domain:modcluster:1.0"&gt;
  &lt;mod-cluster-config advertise-socket="mod_cluster"&gt;
    &lt;dynamic-load-provider history="10" decay="2"&gt;
       &lt;load-metric type="cpu" weight="2" capacity="1"/&gt;
       &lt;load-metric type="sessions" weight="1" capacity="512"/&gt;
       &lt;custom-load-metric class="mypackage.myclass" weight="1" capacity="512"&gt;
          &lt;property name="myproperty" value="myvalue" /&gt;
          &lt;property name="otherproperty" value="othervalue" /&gt;
       &lt;/custom-load-metric&gt;
    &lt;/dynamic-load-provider&gt;
  &lt;/mod-cluster-config&gt;
&lt;/subsystem&gt;
     </programlisting>
     <informaltable frame="all">
     <tgroup cols="3">
        <thead>
          <row>
            <entry>Attribute</entry>
            <entry>Property</entry>
            <entry>Default</entry>
          </row>
        </thead>
        <tbody>
          <row>
            <entry>history</entry>
            <entry>history</entry>
            <entry>512</entry>
          </row>
          <row>
            <entry>decay</entry>
            <entry>decayFactor</entry>
            <entry>512</entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>
    </section>
    <section id="LoadMetric">
     <title>load-metric Configuration</title>
     <para>The load-metric are the "classes" collecting information to allow computation of the load factor sent to httpd</para>
     <informaltable frame="all">
     <tgroup cols="3">
        <thead>
          <row>
            <entry>Attribute</entry>
            <entry>Property</entry>
            <entry>Default</entry>
           </row>
        </thead>
        <tbody>
          <row>
            <entry>type</entry>
            <entry>A Server-Side Load Metrics</entry>
            <entry><emphasis>Mandatory</emphasis></entry>
          </row>
          <row>
            <entry>weight</entry>
            <entry>weight</entry>
            <entry><emphasis>9</emphasis></entry>
          </row>
          <row>
            <entry>capacity</entry>
            <entry>capacity</entry>
            <entry><emphasis>512</emphasis></entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>
    <section id="CustomLoadMetricType">
      <title>Supported load metric types</title>
     <informaltable frame="all">
     <tgroup cols="2">
        <thead>
          <row>
            <entry>type</entry>
            <entry>Corresponding Server-Side Load Metric</entry>
           </row>
        </thead>
        <tbody>
          <row>
            <entry>cpu</entry>
            <entry><link linkend="AverageSystemLoadMetric">AverageSystem</link>LoadMetric</entry>
          </row>
          <row>
            <entry>mem</entry>
            <entry><link linkend="SystemMemoryUsageLoadMetric">SystemMemoryUsage</link>LoadMetric</entry>
          </row>
          <row>
            <entry>heap</entry>
            <entry><link linkend="HeapMemoryUsageLoadMetric">HeapMemoryUsage</link>LoadMetric</entry>
          </row>
          <row>
            <entry>sessions</entry>
            <entry><link linkend="ActiveSessionsLoadMetric">ActiveSessions</link>LoadMetric</entry>
          </row>
          <row>
            <entry>requests</entry>
            <entry><link linkend="RequestCountLoadMetric">ActiveSessions</link>LoadMetric</entry>
          </row>
          <row>
            <entry>send-traffic</entry>
            <entry><link linkend="SendTrafficLoadMetric">SendTraffic</link>LoadMetric</entry>
          </row>
          <row>
            <entry>receive-traffic</entry>
            <entry><link linkend="ReceiveTrafficLoadMetric">ReceiveTraffic</link>LoadMetric</entry>
          </row>
          <row>
            <entry>busyness</entry>
            <entry><link linkend="BusyConnectorsLoadMetric">BusyConnectors</link>LoadMetric</entry>
          </row>
          <row>
            <entry>connection-pool</entry>
            <entry><link linkend="ConnectionPoolUsageLoadMetric">ConnectionPoolUsage</link>LoadMetric</entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>
    </section>
       
    </section>
    <section id="CustomLoadMetric">
     <title>custom-load-metric Configuration</title>
     <para>The custom-load-metric are for user defined "classes" collecting information. They are like the load-metric except <code>type</code>
           is replaced by <code>class</code>:</para>
     <informaltable frame="all">
     <tgroup cols="3">
        <thead>
          <row>
            <entry>Attribute</entry>
            <entry>Property</entry>
            <entry>Default</entry>
           </row>
        </thead>
        <tbody>
          <row>
            <entry>class</entry>
            <entry>Name of your class</entry>
            <entry><emphasis>Mandatory</emphasis></entry>
          </row>
        </tbody>
      </tgroup>
    </informaltable>

    </section>
    
    <section id="UsingJBossConsole">
     <title>load-metric Configuration with the jboss admin console</title>
     <para>The load-metric have 4 commands to add / remove metrics</para>
     <section id="AddMetric">
       <title>add-metric</title>
       <para>Allows to add a <code>load-metric</code> to the <code>dynamic-load-provider</code></para>
       <para>For example:</para>
       <programlisting>
       ./:add-metric(type=cpu, weight=2, capacity=1)
       </programlisting>
     </section>
       
     <section id="RemoveMetric">
       <title>remove-metric</title>
       <para>Allows to remove a <code>load-metric</code> from the <code>dynamic-load-provider</code></para>
       <para>For example:</para>
       <programlisting>
       ./:remove-metric(type=cpu)
       </programlisting>
     </section>

     <section id="AddCustomMetric">
       <title>add-custom-metric</title>
       <para>Allows to add a <code>load-custom-metric</code> to the <code>dynamic-load-provider</code></para>
       <para>For example:</para>
       <programlisting>
       ./:add-custom-metric(class=myclass, weight=2, capacity=1, property=[("pool" => "mypool"), ("var" => "myvariable")])
       </programlisting>
     </section>

     <section id="RemoveCustomMetric">
       <title>remove-custom-metric</title>
       <para>Allows to remove a <code>load-custom-metric</code> from the <code>dynamic-load-provider</code></para>
       <para>For example:</para>
       <programlisting>
       ./:remove-custom-metric(class=myclass)
       </programlisting>
     </section>
    </section>
  </section>
</chapter>
