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| <div class="subTitle">org.apache.mina.handler.chain</div> |
| <h2 title="Interface IoHandlerCommand" class="title">Interface IoHandlerCommand</h2> |
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| <pre>public interface <span class="typeNameLabel">IoHandlerCommand</span></pre> |
| <div class="block"><p>A <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> encapsulates a unit of processing work to be |
| performed, whose purpose is to examine and/or modify the state of a |
| transaction that is represented by custom attributes provided by |
| <a href="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common"><code>IoSession</code></a>. Individual <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a>s can be assembled into |
| a <a href="../../../../../org/apache/mina/handler/chain/IoHandlerChain.html" title="class in org.apache.mina.handler.chain"><code>IoHandlerChain</code></a>, which allows them to either complete the |
| required processing or delegate further processing to the next |
| <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> in the <a href="../../../../../org/apache/mina/handler/chain/IoHandlerChain.html" title="class in org.apache.mina.handler.chain"><code>IoHandlerChain</code></a>.</p> |
| |
| <p><a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> implementations typically retrieve and store state |
| information in the <a href="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common"><code>IoSession</code></a> that is passed as a parameter to |
| the <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html#execute-org.apache.mina.handler.chain.IoHandlerCommand.NextCommand-org.apache.mina.common.IoSession-java.lang.Object-"><code>execute(NextCommand,IoSession,Object)</code></a> method, using custom |
| session attributes. If you think getting attributes is tedious process, |
| you can create a bean which contains getters and setters of all properties |
| and store the bean as a session attribute:</p> |
| |
| <pre> |
| public class MyContext { |
| public String getPropertyX() { ... }; |
| public void setPropertyX(String propertyX) { ... }; |
| public int getPropertyZ() { ... }; |
| public void setPropertyZ(int propertyZ) { ... }; |
| } |
| |
| public class MyHandlderCommand implements IoHandlerCommand { |
| public void execute( NextCommand next, IoSession session, Object message ) throws Exception { |
| MyContext ctx = session.getAttribute( "mycontext" ); |
| ... |
| } |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Version:</span></dt> |
| <dd>$Rev: 555855 $, $Date: 2007-07-13 05:19:00 +0200 (Fri, 13 Jul 2007) $</dd> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd><a href="mailto:dev@directory.apache.org">Apache Directory Project</a></dd> |
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| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.NextCommand.html" title="interface in org.apache.mina.handler.chain">IoHandlerCommand.NextCommand</a></span></code> |
| <div class="block">Represents an indirect reference to the next <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> of |
| the <a href="../../../../../org/apache/mina/handler/chain/IoHandlerChain.html" title="class in org.apache.mina.handler.chain"><code>IoHandlerChain</code></a>.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html#execute-org.apache.mina.handler.chain.IoHandlerCommand.NextCommand-org.apache.mina.common.IoSession-java.lang.Object-">execute</a></span>(<a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.NextCommand.html" title="interface in org.apache.mina.handler.chain">IoHandlerCommand.NextCommand</a> next, |
| <a href="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</a> session, |
| java.lang.Object message)</code> |
| <div class="block">Execute a unit of processing work to be performed.</div> |
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| <h4>execute</h4> |
| <pre>void execute(<a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.NextCommand.html" title="interface in org.apache.mina.handler.chain">IoHandlerCommand.NextCommand</a> next, |
| <a href="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common">IoSession</a> session, |
| java.lang.Object message) |
| throws java.lang.Exception</pre> |
| <div class="block"><p>Execute a unit of processing work to be performed. This |
| <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> may either complete the required processing |
| and just return to stop the processing, or delegate remaining |
| processing to the next <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> in a <a href="../../../../../org/apache/mina/handler/chain/IoHandlerChain.html" title="class in org.apache.mina.handler.chain"><code>IoHandlerChain</code></a> |
| containing this <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> by calling |
| <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.NextCommand.html#execute-org.apache.mina.common.IoSession-java.lang.Object-"><code>IoHandlerCommand.NextCommand.execute(IoSession,Object)</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>next</code> - an indirect reference to the next <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a> that |
| provides a way to forward the request to the next <a href="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.html" title="interface in org.apache.mina.handler.chain"><code>IoHandlerCommand</code></a>.</dd> |
| <dd><code>session</code> - the <a href="../../../../../org/apache/mina/common/IoSession.html" title="interface in org.apache.mina.common"><code>IoSession</code></a> which is associated with |
| this request</dd> |
| <dd><code>message</code> - the message object of this request</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code> - general purpose exception return |
| to indicate abnormal termination</dd> |
| </dl> |
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