| [66] | 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The Channel Interceptor object</title><meta value="Filip Hanik" name="author"><meta value="fhanik@apache.org" name="email"></head><body vlink="#525D76" alink="#525D76" link="#525D76" text="#000000" bgcolor="#ffffff"><table cellspacing="0" width="100%" border="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img border="0" alt=" |
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| 2 | The Apache Tomcat Servlet/JSP Container |
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| 3 | " align="right" src="../../images/tomcat.gif"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img border="0" alt="Apache Logo" align="right" src="../../images/asf-logo.gif"></a></td></tr></table><table cellspacing="4" width="100%" border="0"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td align="left" valign="top" width="80%"><table cellspacing="4" width="100%" border="0"><tr><td valign="top" align="left"><h1>Apache Tomcat Configuration Reference</h1><h2>The Channel Interceptor object</h2></td><td nowrap="true" valign="top" align="right"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> |
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| 4 | <p> |
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| 5 | Apache Tribes supports an interceptor architecture to intercept both messages and membership notifications. |
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| 6 | This architecture allows decoupling of logic and opens the way for some very kewl feature add ons. |
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| 7 | </p> |
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| 8 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Available Interceptors"><strong>Available Interceptors</strong></a></font></td></tr><tr><td><blockquote> |
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| 9 | <p> |
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| 10 | <ul> |
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| 11 | <li><code>org.apache.catalina.tribes.group.interceptors.TcpFailureDetector</code></li> |
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| 12 | <li><code>org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor</code></li> |
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| 13 | <li><code>org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor</code></li> |
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| 14 | <li><code>org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor</code></li> |
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| 15 | <li><code>org.apache.catalina.tribes.group.interceptors.NonBlockingCoordinator</code></li> |
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| 16 | <li><code>org.apache.catalina.tribes.group.interceptors.OrderInterceptor</code></li> |
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| 17 | <li><code>org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor</code></li> |
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| 18 | <li><code>org.apache.catalina.tribes.group.interceptors.TwoPhaseCommitInterceptor</code></li> |
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| 19 | <li><code>org.apache.catalina.tribes.group.interceptors.DomainFilterInterceptor</code></li> |
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| 20 | <li><code>org.apache.catalina.tribes.group.interceptors.FragmentationInterceptor</code></li> |
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| 21 | <li><code>org.apache.catalina.tribes.group.interceptors.GzipInterceptor</code></li> |
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| 22 | </ul> |
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| 23 | </p> |
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| 24 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Static Membership"><strong>Static Membership</strong></a></font></td></tr><tr><td><blockquote> |
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| 25 | <p> |
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| 26 | In addition to dynamic discovery, Apache Tribes also supports static membership, with membership verification. |
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| 27 | To achieve this add the <code>org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor</code> |
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| 28 | underneath the <code>org.apache.catalina.tribes.group.interceptors.TcpFailureDetector</code> interceptor. |
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| 29 | Inside the <code>StaticMembershipInterceptor</code> you can add the static members you wish to have. |
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| 30 | The <code>TcpFailureDetector</code> will do a health check on the static members,and also monitor them for crashes |
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| 31 | so they will have the same level of notification mechanism as the members that are automatically discovered. |
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| 32 | <div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr><tr><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre> |
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| 33 | <Interceptor className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor"> |
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| 34 | <Member className="org.apache.catalina.tribes.membership.StaticMember" |
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| 35 | port="5678" |
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| 36 | securePort="-1" |
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| 37 | host="tomcat01.mydomain.com" |
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| 38 | domain="staging-cluster" |
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| 39 | uniqueId="{0,1,2,3,4,5,6,7,8,9}"/> |
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| 40 | </Interceptor> |
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| 41 | |
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| 42 | </pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr><tr><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1" src="../../images/void.gif"></td></tr></table></div> |
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| 43 | </p> |
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| 44 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 45 | |
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| 46 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Common Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 47 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 48 | Required, as there is no default |
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| 49 | </td></tr><tr><td valign="center" align="left"><code>optionFlag</code></td><td valign="center" align="left"> |
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| 50 | If you want the interceptor to trigger on certain message depending on the message's option flag, |
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| 51 | you can setup the interceptors flag here. |
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| 52 | The default value is <code>0</code>, meaning this interceptor will trigger on all messages. |
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| 53 | </td></tr></table> |
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| 54 | </blockquote></td></tr></table> |
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| 55 | |
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| 56 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><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> |
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| 57 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 58 | Required, This dispatcher uses JDK 1.5 java.util.concurrent package |
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| 59 | </td></tr><tr><td valign="center" align="left"><code>optionFlag</code></td><td valign="center" align="left"> |
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| 60 | The default and hard coded value is <code>8 (org.apache.catalina.tribes.Channel.SEND_OPTIONS_ASYNCHRONOUS)</code>. |
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| 61 | The dispatcher will trigger on this value only, as it is predefined by Tribes. |
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| 62 | </td></tr></table> |
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| 63 | </blockquote></td></tr></table> |
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| 64 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><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> |
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| 65 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 66 | Required, Same implementation as <code>MessageDispatch15Interceptor</code>, but with JDK 1.4 compliance. |
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| 67 | </td></tr><tr><td valign="center" align="left"><code>optionFlag</code></td><td valign="center" align="left"> |
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| 68 | The default and hard coded value is <code>8 (org.apache.catalina.tribes.Channel.SEND_OPTIONS_ASYNCHRONOUS)</code>. |
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| 69 | The dispatcher will trigger on this value only, as it is predefined by Tribes. |
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| 70 | </td></tr><tr><td valign="center" align="left"><code>alwaysSend</code></td><td valign="center" align="left"> |
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| 71 | What behavior should be executed when the dispatch queue is full. If <code>true</code> (default), then the message is |
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| 72 | is sent synchronously, if <code>false</code> an error is thrown. |
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| 73 | </td></tr><tr><td valign="center" align="left"><code>maxQueueSize</code></td><td valign="center" align="left"> |
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| 74 | 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 |
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| 75 | if the queue fills up, one can trigger the behavior, if <code>alwaysSend</code> is set to true, the mesage will be sent synchronously |
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| 76 | if the flag is false, an error is thrown |
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| 77 | </td></tr></table> |
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| 78 | </blockquote></td></tr></table> |
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| 79 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><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> |
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| 80 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr></table> |
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| 81 | </blockquote></td></tr></table> |
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| 82 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><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> |
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| 83 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>interval</code></td><td valign="center" align="left"> |
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| 84 | Defines the interval in number of messages when we are to report the throughput statistics. |
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| 85 | The report is logged to the <code>org.apache.juli.logging.LogFactory.getLog(ThroughputInterceptor.class)</code> |
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| 86 | logger under the <code>INFO</code> level. |
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| 87 | Default value is to report every <code>10000</code> messages. |
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| 88 | </td></tr></table> |
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| 89 | </blockquote></td></tr></table> |
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| 90 | |
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| 91 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Nested element StaticMember Attributes"><strong>Nested element StaticMember Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 92 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><strong><code>className</code></strong></td><td valign="center" align="left"> |
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| 93 | Only one implementation available:<code>org.apache.catalina.tribes.membership.StaticMember</code> |
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| 94 | </td></tr><tr><td valign="center" align="left"><strong><code>port</code></strong></td><td valign="center" align="left"> |
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| 95 | The port that this static member listens to for cluster messages |
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| 96 | </td></tr><tr><td valign="center" align="left"><code>securePort</code></td><td valign="center" align="left"> |
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| 97 | The secure port this static member listens to for encrypted cluster messages |
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| 98 | default value is <code>-1</code>, this value means the member is not listening on a secure port |
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| 99 | </td></tr><tr><td valign="center" align="left"><strong><code>host</code></strong></td><td valign="center" align="left"> |
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| 100 | The host (or network interface) that this static member listens for cluster messages. |
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| 101 | Three different type of values are possible:<br> |
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| 102 | 1. IP address in the form of "216.123.1.23"<br> |
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| 103 | 2. Hostnames like "tomcat01.mydomain.com" or "tomcat01" as long as they resolve correctly<br> |
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| 104 | 3. byte array in string form, for example {216,123,12,3}<br> |
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| 105 | </td></tr><tr><td valign="center" align="left"><strong><code>domain</code></strong></td><td valign="center" align="left"> |
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| 106 | The logical cluster domain for this this static member listens for cluster messages. |
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| 107 | Two different type of values are possible:<br> |
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| 108 | 1. Regular string values like "staging-domain" or "tomcat-cluster" will be converted into bytes |
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| 109 | using ISO-8859-1 encoding. |
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| 110 | 2. byte array in string form, for example {216,123,12,3}<br> |
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| 111 | </td></tr><tr><td valign="center" align="left"><strong><code>uniqueId</code></strong></td><td valign="center" align="left"> |
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| 112 | A universally uniqueId for this static member. |
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| 113 | The values must be 16 bytes in the following form:<br> |
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| 114 | 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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| 115 | </td></tr></table> |
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| 116 | </blockquote></td></tr></table> |
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| 117 | |
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| 118 | |
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| 119 | </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font size="-1" color="#525D76"><em> |
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| 120 | Copyright © 1999-2008, Apache Software Foundation |
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| 121 | </em></font></div></td></tr></table></body></html> |
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