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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 Aug 28 21:12:48 PDT 2008 --><TITLE>Cache (Openfire 3.6.0a Javadoc)</TITLE><META NAME="keywords" CONTENT="org.jivesoftware.util.cache.Cache interface"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Cache (Openfire 3.6.0a Javadoc)";}</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><b>Openfire 3.6.0a Javadoc</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../../../org/jivesoftware/util/cache/Cacheable.html" title="interface in org.jivesoftware.util.cache"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html?org/jivesoftware/util/cache/Cache.html" target="_top"><B>FRAMES</B></A> <A HREF="Cache.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.jivesoftware.util.cache</FONT><BR>Interface Cache<K,V></H2><DL><DT><B>All Superinterfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html" title="class or interface in java.util">Map</A><K,V></DD></DL><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/jivesoftware/util/cache/CacheWrapper.html" title="class in org.jivesoftware.util.cache">CacheWrapper</A>, <A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="class in org.jivesoftware.util.cache">DefaultCache</A></DD></DL><HR><DL><DT><PRE>public interface <B>Cache<K,V></B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html" title="class or interface in java.util">Map</A><K,V></DL></PRE><P>General purpose cache. It stores objects associated with unique keys in memory for fast access. All keys and values added to the cache must implement the Serializable interface. Values may implement the Cacheable interface, which allows the cache to determine object size much more quickly. These restrictions allow a cache to never grow larger than a specified number of bytes and to optionally be distributed over a cluster of servers.<p> If the cache does grow too large, objects will be removed such that those that are accessed least frequently are removed first. Because expiration happens automatically, the cache makes <b>no</b> gaurantee as to how long an object will remain in cache after it is put in.<p> Optionally, a maximum lifetime for all objects can be specified. In that case, objects will be deleted from cache after that amount of time, even if they are frequently accessed. This feature is useful if objects put in cache represent data that should be periodically refreshed; for example, information from a database.<p> All cache operations are thread safe.<p><P><P><DL><DT><B>See Also:</B><DD><A HREF="../../../../org/jivesoftware/util/cache/Cacheable.html" title="interface in org.jivesoftware.util.cache"><CODE>Cacheable</CODE></A></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><A NAME="nested_class_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>Nested Class Summary</B></FONT></TH></TR></TABLE> <A NAME="nested_classes_inherited_from_class_java.util.Map"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Nested classes/interfaces inherited from interface java.util.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html" title="class or interface in java.util">Map</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.Entry.html" title="class or interface in java.util">Map.Entry</A><<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.Entry.html" title="class or interface in java.util">K</A>,<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.Entry.html" title="class or interface in java.util">V</A>></CODE></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> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getCacheHits()">getCacheHits</A></B>()</CODE><BR> Returns the number of cache hits.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getCacheMisses()">getCacheMisses</A></B>()</CODE><BR> Returns the number of cache misses.</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/jivesoftware/util/cache/Cache.html#getCacheSize()">getCacheSize</A></B>()</CODE><BR> Returns the size of the cache contents in bytes.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getMaxCacheSize()">getMaxCacheSize</A></B>()</CODE><BR> Returns the maximum size of the cache in bytes.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getMaxLifetime()">getMaxLifetime</A></B>()</CODE><BR> Returns the maximum number of milliseconds that any object can live in cache.</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/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getName()">getName</A></B>()</CODE><BR> Returns the name of the cache.</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/jivesoftware/util/cache/Cache.html#setMaxCacheSize(int)">setMaxCacheSize</A></B>(int maxSize)</CODE><BR> Sets the maximum size of the cache in bytes.</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/jivesoftware/util/cache/Cache.html#setMaxLifetime(long)">setMaxLifetime</A></B>(long maxLifetime)</CODE><BR> Sets the maximum number of milliseconds that any object can live in cache.</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/jivesoftware/util/cache/Cache.html#setName(java.lang.String)">setName</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> name)</CODE><BR> Sets the name of the cache</TD></TR></TABLE> <A NAME="methods_inherited_from_class_java.util.Map"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TH ALIGN="left"><B>Methods inherited from interface java.util.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html" title="class or interface in java.util">Map</A></B></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#clear()" title="class or interface in java.util">clear</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#containsKey(java.lang.Object)" title="class or interface in java.util">containsKey</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#containsValue(java.lang.Object)" title="class or interface in java.util">containsValue</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#entrySet()" title="class or interface in java.util">entrySet</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#equals(java.lang.Object)" title="class or interface in java.util">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#get(java.lang.Object)" title="class or interface in java.util">get</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#hashCode()" title="class or interface in java.util">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#isEmpty()" title="class or interface in java.util">isEmpty</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#keySet()" title="class or interface in java.util">keySet</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#put(K, V)" title="class or interface in java.util">put</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#putAll(java.util.Map)" title="class or interface in java.util">putAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#remove(java.lang.Object)" title="class or interface in java.util">remove</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#size()" title="class or interface in java.util">size</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.html#values()" title="class or interface in java.util">values</A></CODE></TD></TR></TABLE> <P><!-- ============ METHOD DETAIL ========== -->⌨️ 快捷键说明
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