objectpool.html
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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_15) on Thu Jul 31 17:20:17 EDT 2008 --><TITLE>ObjectPool (Mondrian OLAP Server, version 3.0.4.11371)</TITLE><META NAME="keywords" CONTENT="mondrian.util.ObjectPool class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="ObjectPool (Mondrian OLAP Server, version 3.0.4.11371)";}</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="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="../../mondrian/util/ObjectFactory.Singleton.html" title="class in mondrian.util"><B>PREV CLASS</B></A> <A HREF="../../mondrian/util/ObjectPoolTest.html" title="class in mondrian.util"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?mondrian/util/ObjectPool.html" target="_top"><B>FRAMES</B></A> <A HREF="ObjectPool.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 | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <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">mondrian.util</FONT><BR>Class ObjectPool<T></H2><PRE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> <IMG SRC="../../resources/inherit.gif" ALT="extended by "><B>mondrian.util.ObjectPool<T></B></PRE><HR><DL><DT><PRE>public class <B>ObjectPool<T></B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL></PRE><P>An <code>ObjectPool</code> is a low-memory replacement for a <A HREF="http://java.sun.com/javase/6/docs/api/java/util/HashSet.html" title="class or interface in java.util"><CODE>HashSet</CODE></A>. A HashSet contains a <A HREF="http://java.sun.com/javase/6/docs/api/java/util/HashMap.html" title="class or interface in java.util"><CODE>HashMap</CODE></A> which in turn has an array of Entry objects, the Entry objects themselves, and the key and value objects. An ObjectPool has simply an array of objects and the objects themselves which server as both key and value. <p> This is like the String <code>intern</code> method, but works for an Object type and whereas the String <code>intern</code> method is global an ObjectPool can be used within a context and then garbage collected. Objects can not removed from an ObjectPool except by calling the <code>clear</code> method which removes all objects. <p> Just as with a HashSet's key objects, objects to be placed into an ObjectPool must implement the <code>equals</code> and <code>hashCode</code> methods. <p> This implementation is NOT thread safe.<P><P><DL><DT><B>Version:</B></DT> <DD>$Id: //open/mondrian-release/3.0/src/main/mondrian/util/ObjectPool.java#2 $</DD><DT><B>Author:</B></DT> <DD>Richard Emberson</DD></DL><HR><P><!-- =========== FIELD SUMMARY =========== --><A NAME="field_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>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#DEFAULT_CAPACITY">DEFAULT_CAPACITY</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#DEFAULT_MAX_LOAD_FACTOR">DEFAULT_MAX_LOAD_FACTOR</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static double</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#DEFAULT_MIN_LOAD_FACTOR">DEFAULT_MIN_LOAD_FACTOR</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#distinct">distinct</A></B></CODE><BR> The number of distinct associations in the map; its "size()".</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static byte</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#FREE">FREE</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#freeEntries">freeEntries</A></B></CODE><BR> The number of table entries in state==FREE.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected static byte</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#FULL">FULL</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#highWaterMark">highWaterMark</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected double</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#maxLoadFactor">maxLoadFactor</A></B></CODE><BR> The maximum load factor for the hashtable.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected double</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#minLoadFactor">minLoadFactor</A></B></CODE><BR> The minimum load factor for the hashtable.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../../mondrian/util/ObjectPool.html" title="type parameter in ObjectPool">T</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#values">values</A></B></CODE><BR> </TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_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>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#ObjectPool()">ObjectPool</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#ObjectPool(int)">ObjectPool</A></B>(int initialCapacity)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#ObjectPool(int, double, double)">ObjectPool</A></B>(int initialCapacity, double minLoadFactor, double maxLoadFactor)</CODE><BR> </TD></TR></TABLE> <!-- ========== 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> <A HREF="../../mondrian/util/ObjectPool.html" title="type parameter in ObjectPool">T</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#add(T)">add</A></B>(<A HREF="../../mondrian/util/ObjectPool.html" title="type parameter in ObjectPool">T</A> key)</CODE><BR> Adds an object to the ObjectPool if it is not already in the pool or returns the object that is already in the pool that matches the object being added.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected int</CODE></FONT></TD><TD><CODE><B><A HREF="../../mondrian/util/ObjectPool.html#chooseGrowCapacity(int, double, double)">chooseGrowCapacity</A></B>(int size, double minLoad, double maxLoad)</CODE>⌨️ 快捷键说明
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