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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 1.5.0_06) on Sun Apr 02 20:52:28 EDT 2006 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>KeyedObjectPool (Commons Pool 1.3 API)</TITLE><META NAME="keywords" CONTENT="org.apache.commons.pool.KeyedObjectPool interface"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="KeyedObjectPool (Commons Pool 1.3 API)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= 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/KeyedObjectPool.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/commons/pool/BasePoolableObjectFactory.html" title="class in org.apache.commons.pool"><B>PREV CLASS</B></A> <A HREF="../../../../org/apache/commons/pool/KeyedObjectPoolFactory.html" title="interface in org.apache.commons.pool"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html?org/apache/commons/pool/KeyedObjectPool.html" target="_top"><B>FRAMES</B></A> <A HREF="KeyedObjectPool.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: NESTED | 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.commons.pool</FONT><BR>Interface KeyedObjectPool</H2><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/commons/pool/BaseKeyedObjectPool.html" title="class in org.apache.commons.pool">BaseKeyedObjectPool</A>, <A HREF="../../../../org/apache/commons/pool/impl/GenericKeyedObjectPool.html" title="class in org.apache.commons.pool.impl">GenericKeyedObjectPool</A>, <A HREF="../../../../org/apache/commons/pool/impl/StackKeyedObjectPool.html" title="class in org.apache.commons.pool.impl">StackKeyedObjectPool</A></DD></DL><HR><DL><DT><PRE>public interface <B>KeyedObjectPool</B></DL></PRE><P>A "keyed" pooling interface. <p> A keyed pool pools instances of multiple types. Each type may be accessed using an arbitrary key. <p> Example of use: <table border="1" cellspacing="0" cellpadding="3" align="center" bgcolor="#FFFFFF"><tr><td><pre> Object obj = <font color="#0000CC">null</font>; Object key = <font color="#CC0000">"Key"</font>; <font color="#0000CC">try</font> { obj = pool.borrowObject(key); <font color="#00CC00">//...use the object...</font> } <font color="#0000CC">catch</font>(Exception e) { <font color="#00CC00">//...handle any exceptions...</font> } <font color="#0000CC">finally</font> { <font color="#00CC00">// make sure the object is returned to the pool</font> <font color="#0000CC">if</font>(<font color="#0000CC">null</font> != obj) { pool.returnObject(key,obj); } }</pre></td></tr></table> <p> <A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html" title="interface in org.apache.commons.pool"><CODE>KeyedObjectPool</CODE></A> implementations <i>may</i> choose to store at most one instance per key value, or may choose to maintain a pool of instances for each key (essentially creating a <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> of <A HREF="../../../../org/apache/commons/pool/ObjectPool.html" title="interface in org.apache.commons.pool"><CODE>pools</CODE></A>). </p><P><P><DL><DT><B>Version:</B></DT> <DD>$Revision: 155430 $ $Date: 2005-02-26 08:13:28 -0500 (Sat, 26 Feb 2005) $</DD><DT><B>See Also:</B><DD><A HREF="../../../../org/apache/commons/pool/KeyedPoolableObjectFactory.html" title="interface in org.apache.commons.pool"><CODE>KeyedPoolableObjectFactory</CODE></A>, <A HREF="../../../../org/apache/commons/pool/KeyedObjectPoolFactory.html" title="interface in org.apache.commons.pool"><CODE>KeyedObjectPoolFactory</CODE></A>, <A HREF="../../../../org/apache/commons/pool/ObjectPool.html" title="interface in org.apache.commons.pool"><CODE>ObjectPool</CODE></A></DL><HR><P><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html#addObject(java.lang.Object)">addObject</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</CODE><BR> Create an object using my <A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html#setFactory(org.apache.commons.pool.KeyedPoolableObjectFactory)"><CODE>factory</CODE></A> or other implementation dependent mechanism, and place it into the pool.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html#borrowObject(java.lang.Object)">borrowObject</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</CODE><BR> Obtain an instance from my pool for the specified <i>key</i>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html#clear()">clear</A></B>()</CODE><BR> Clears my pool, removing all pooled instances (optional operation).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html#clear(java.lang.Object)">clear</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</CODE><BR> Clears the specified pool, removing all pooled instances corresponding to the given <i>key</i> (optional operation).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html#close()">close</A></B>()</CODE><BR> Close this pool, and free any resources associated with it.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/apache/commons/pool/KeyedObjectPool.html#getNumActive()">getNumActive</A></B>()</CODE><BR> Returns the total number of instances⌨️ 快捷键说明
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