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</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt="
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<ul><li><a href="#Introduction">Introduction</a></li><li><a href="#Available_Interceptors">Available Interceptors</a></li><li><a href="#Static_Membership">Static Membership</a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#org.apache.catalina.tribes.group.interceptors.DomainFilterInterceptor_Attributes">org.apache.catalina.tribes.group.interceptors.DomainFilterInterceptor Attributes</a></li><li><a href="#org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor_Attributes">org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor Attributes</a></li><li><a href="#org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor_Attributes">org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor Attributes</a></li><li><a href="#org.apache.catalina.tribes.group.interceptors.TcpFailureDetector_Attributes">org.apache.catalina.tribes.group.interceptors.TcpFailureDetector Attributes</a></li><li><a href="#org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor_Attributes">org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor Attributes</a></li><li><a href="#org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor_Attributes">org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor Attributes</a></li></ol></li><li><a href="#Nested_Components">Nested Components</a><ol><li><a href="#StaticMember_Attributes">StaticMember Attributes</a></li></ol></li></ul>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>
<p>
Apache Tribes supports an interceptor architecture to intercept both messages and membership notifications.
This architecture allows decoupling of logic and opens the way for some very kewl feature add ons.
</p>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Available Interceptors"><!--()--></a><a name="Available_Interceptors"><strong>Available Interceptors</strong></a></font></td></tr><tr><td><blockquote>
<ul>
<li><code>org.apache.catalina.tribes.group.interceptors.TcpFailureDetector</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.NonBlockingCoordinator</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.OrderInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.SimpleCoordinator</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.TwoPhaseCommitInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.DomainFilterInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.FragmentationInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.GzipInterceptor</code></li>
<li><code>org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor</code></li>
</ul>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Static Membership"><!--()--></a><a name="Static_Membership"><strong>Static Membership</strong></a></font></td></tr><tr><td><blockquote>
<p>
In addition to dynamic discovery, Apache Tribes also supports static membership, with membership verification.
To achieve this add the <code>org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor</code>
underneath the <code>org.apache.catalina.tribes.group.interceptors.TcpFailureDetector</code> interceptor.
Inside the <code>StaticMembershipInterceptor</code> you can add the static members you wish to have.
The <code>TcpFailureDetector</code> will do a health check on the static members,and also monitor them for crashes
so they will have the same level of notification mechanism as the members that are automatically discovered.</p>
<div class="codeBox"><pre><code> &lt;Interceptor className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor"&gt;
&lt;LocalMember className="org.apache.catalina.tribes.membership.StaticMember"
domain="staging-cluster"
uniqueId="{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,1}"/&gt;
&lt;Member className="org.apache.catalina.tribes.membership.StaticMember"
port="5678"
securePort="-1"
host="tomcat01.mydomain.com"
domain="staging-cluster"
uniqueId="{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}"/&gt;
&lt;/Interceptor&gt;</code></pre></div>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"><!--()--></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center">
Required, as there is no default
</td></tr><tr><td align="left" valign="center"><code class="attributeName">optionFlag</code></td><td align="left" valign="center">
If you want the interceptor to trigger on certain message depending on the message's option flag,
you can setup the interceptors flag here.
The default value is <code>0</code>, meaning this interceptor will trigger on all messages.
</td></tr></table>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.tribes.group.interceptors.DomainFilterInterceptor Attributes"><!--()--></a><a name="org.apache.catalina.tribes.group.interceptors.DomainFilterInterceptor_Attributes"><strong>org.apache.catalina.tribes.group.interceptors.DomainFilterInterceptor Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">domain</code></strong></td><td align="left" valign="center">
The logical cluster domain that this Interceptor accepts.
Two different type of values are possible:<br>
1. Regular string values like "staging-domain" or "tomcat-cluster" will be converted into bytes
using ISO-8859-1 encoding.<br>
2. byte array in string form, for example {216,123,12,3}<br>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">logInterval</code></td><td align="left" valign="center">
This value indicates the interval for logging for messages from different domains.
The default is 100, which means that to log per 100 messages.
</td></tr></table>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor Attributes"><!--()--></a><a name="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor_Attributes"><strong>org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center">
Required, This dispatcher uses JDK 1.5 java.util.concurrent package
</td></tr><tr><td align="left" valign="center"><code class="attributeName">optionFlag</code></td><td align="left" valign="center">
The default and hard coded value is <code>8 (org.apache.catalina.tribes.Channel.SEND_OPTIONS_ASYNCHRONOUS)</code>.
The dispatcher will trigger on this value only, as it is predefined by Tribes.
The other attributes are inherited from its base class <code>org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor</code>.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">maxThreads</code></td><td align="left" valign="center">
The maximum number of threads in this pool, default is 10.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">maxSpareThreads</code></td><td align="left" valign="center">
The number of threads to keep in the pool, default is 2.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">keepAliveTime</code></td><td align="left" valign="center">
Maximum number of milliseconds of until Idle thread terminates. Default value is 5000(5 seconds).
</td></tr></table>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor Attributes"><!--()--></a><a name="org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor_Attributes"><strong>org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center">
Required, Same implementation as <code>MessageDispatch15Interceptor</code>, but with JDK 1.4 compliance.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">optionFlag</code></td><td align="left" valign="center">
The default and hard coded value is <code>8 (org.apache.catalina.tribes.Channel.SEND_OPTIONS_ASYNCHRONOUS)</code>.
The dispatcher will trigger on this value only, as it is predefined by Tribes.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">alwaysSend</code></td><td align="left" valign="center">
What behavior should be executed when the dispatch queue is full. If <code>true</code> (default), then the message is
is sent synchronously, if <code>false</code> an error is thrown.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">maxQueueSize</code></td><td align="left" valign="center">
Size in bytes of the dispatch queue, the default value is <code> 1024*1024*64 (64MB)</code> sets the maximum queue size for the dispatch queue
if the queue fills up, one can trigger the behavior, if <code>alwaysSend</code> is set to true, the message will be sent synchronously
if the flag is false, an error is thrown
</td></tr></table>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector Attributes"><!--()--></a><a name="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector_Attributes"><strong>org.apache.catalina.tribes.group.interceptors.TcpFailureDetector Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">connectTimeout</code></td><td align="left" valign="center">
Specifies the timeout, in milliseconds, to use when attempting a TCP connection
to the suspect node. Default is 1000.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">performSendTest</code></td><td align="left" valign="center">
If true is set, send a test message to the suspect node. Default is true.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">performReadTest</code></td><td align="left" valign="center">
If true is set, read the response of the test message that sent. Default is false.
<strong>Note: </strong>if <code>performSendTest</code> is false, this attribute will have no effect.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">readTestTimeout</code></td><td align="left" valign="center">
Specifies the timeout, in milliseconds, to use when performing a read test
to the suspicious node. Default is 5000.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">removeSuspectsTimeout</code></td><td align="left" valign="center">
The maximum time(in seconds) for remove from removeSuspects. Member of
removeSuspects will be automatically removed after removeSuspectsTimeout.
If a negative value specified, the removeSuspects members never be
removed until disappeared really. If the attribute is not provided,
a default of 300 seconds (5 minutes) is used.
</td></tr></table>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor Attributes"><!--()--></a><a name="org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor_Attributes"><strong>org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">interval</code></td><td align="left" valign="center">
If useThread == true, defines the interval of sending a ping message.
default is 1000 ms.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">useThread</code></td><td align="left" valign="center">
Flag of whether to start a thread for sending a ping message.
If set to true, this interceptor will start a local thread for sending a ping message.
if set to false, channel heartbeat will send a ping message.
default is false.
</td></tr></table>
</blockquote></td></tr></table>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor Attributes"><!--()--></a><a name="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor_Attributes"><strong>org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor Attributes</strong></a></font></td></tr><tr><td><blockquote>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">interval</code></td><td align="left" valign="center">
Defines the interval in number of messages when we are to report the throughput statistics.
The report is logged to the <code>org.apache.juli.logging.LogFactory.getLog(ThroughputInterceptor.class)</code>
logger under the <code>INFO</code> level.
Default value is to report every <code>10000</code> messages.
</td></tr></table>
</blockquote></td></tr></table>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Nested Components"><!--()--></a><a name="Nested_Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote>
<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="StaticMember Attributes"><!--()--></a><a name="StaticMember_Attributes"><strong>StaticMember Attributes</strong></a></font></td></tr><tr><td><blockquote>
<p><b>LocalMember:</b> <br>
Static member that is the local member of the static cluster group.
</p>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center">
Only one implementation available:<code>org.apache.catalina.tribes.membership.StaticMember</code>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">port</code></td><td align="left" valign="center">
There is no need to set.
The value of this attribute inherits from the cluster receiver setting.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">securePort</code></td><td align="left" valign="center">
There is no need to set.
The value of this attribute inherits from the cluster receiver setting.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">host</code></td><td align="left" valign="center">
There is no need to set.
The value of this attribute inherits from the cluster receiver setting.
</td></tr><tr><td align="left" valign="center"><code class="attributeName">domain</code></td><td align="left" valign="center">
The logical cluster domain for that this static member listens for cluster messages.
Two different type of values are possible:<br>
1. Regular string values like "staging-domain" or "tomcat-cluster" will be converted into bytes
using ISO-8859-1 encoding.
2. byte array in string form, for example {216,123,12,3}<br>
</td></tr><tr><td align="left" valign="center"><strong><code class="attributeName">uniqueId</code></strong></td><td align="left" valign="center">
A universally uniqueId for this static member.
The values must be 16 bytes in the following form:<br>
1. byte array in string form, for example {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}<br>
</td></tr></table>
<p><b>Member:</b> <br>
Static member that add to the static cluster group.
</p>
<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><strong><code class="attributeName">className</code></strong></td><td align="left" valign="center">
Only one implementation available:<code>org.apache.catalina.tribes.membership.StaticMember</code>
</td></tr><tr><td align="left" valign="center"><strong><code class="attributeName">port</code></strong></td><td align="left" valign="center">
The port that this static member listens to for cluster messages
</td></tr><tr><td align="left" valign="center"><code class="attributeName">securePort</code></td><td align="left" valign="center">
The secure port this static member listens to for encrypted cluster messages
default value is <code>-1</code>, this value means the member is not listening on a secure port
</td></tr><tr><td align="left" valign="center"><strong><code class="attributeName">host</code></strong></td><td align="left" valign="center">
The host (or network interface) that this static member listens for cluster messages.
Three different type of values are possible:<br>
1. IP address in the form of "216.123.1.23"<br>
2. Hostnames like "tomcat01.mydomain.com" or "tomcat01" as long as they resolve correctly<br>
3. byte array in string form, for example {216,123,12,3}<br>
</td></tr><tr><td align="left" valign="center"><code class="attributeName">domain</code></td><td align="left" valign="center">
The logical cluster domain for that this static member listens for cluster messages.
Two different type of values are possible:<br>
1. Regular string values like "staging-domain" or "tomcat-cluster" will be converted into bytes
using ISO-8859-1 encoding.<br>
2. byte array in string form, for example {216,123,12,3}<br>
</td></tr><tr><td align="left" valign="center"><strong><code class="attributeName">uniqueId</code></strong></td><td align="left" valign="center">
A universally uniqueId for this static member.
The values must be 16 bytes in the following form:<br>
1. byte array in string form, for example {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}<br>
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