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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.6.0_04) on Tue Feb 19 10:50:44 MST 2008 --><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><TITLE>IoHandlerCommand (Apache MINA 2.0.0-M1 API Documentation)</TITLE><META NAME="date" CONTENT="2008-02-19"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ if (location.href.indexOf('is-external=true') == -1) { parent.document.title="IoHandlerCommand (Apache MINA 2.0.0-M1 API Documentation)"; }}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><HR><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/IoHandlerCommand.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../org/apache/mina/handler/chain/IoHandlerChain.Entry.html" title="class in org.apache.mina.handler.chain"><B>PREV CLASS</B></A> <A HREF="../../../../../org/apache/mina/handler/chain/IoHandlerCommand.NextCommand.html" title="interface in org.apache.mina.handler.chain"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../index.html?org/apache/mina/handler/chain/IoHandlerCommand.html" target="_top"><B>FRAMES</B></A> <A HREF="IoHandlerCommand.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#nested_class_summary">NESTED</A> | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.apache.mina.handler.chain</FONT><BR>Interface IoHandlerCommand</H2><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/mina/handler/chain/IoHandlerChain.html" title="class in org.apache.mina.handler.chain">IoHandlerChain</A></DD></DL><HR><DL><DT><PRE>public interface <B>IoHandlerCommand</B></DL></PRE><P><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><P><P><DL><DT><B>Version:</B></DT> <DD>$Rev: 576217 $, $Date: 2007-09-16 17:55:27 -0600 (Sun, 16 Sep 2007) $</DD><DT><B>Author:</B></DT> <DD><a href="mailto:dev@directory.apache.org">Apache Directory Project</a></DD></DL><HR>⌨️ 快捷键说明
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