defaultcache.html

开源软件openfire的API文件。进行openfire的二次开发所必需的工具。

<A NAME="setName(java.lang.String)"><!-- --></A><H3>
setName</H3>
<PRE>
public void <B>setName</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>&nbsp;name)</PRE>
<DL>
<DD>Sets the name of this cache.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#setName(java.lang.String)">setName</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>name</CODE> - the name of this cache.</DL>
</DD>
</DL>
<HR>

<A NAME="getCacheHits()"><!-- --></A><H3>
getCacheHits</H3>
<PRE>
public long <B>getCacheHits</B>()</PRE>
<DL>
<DD>Returns the number of cache hits. A cache hit occurs every
 time the get method is called and the cache contains the requested
 object.<p>

 Keeping track of cache hits and misses lets one measure how efficient
 the cache is; the higher the percentage of hits, the more efficient.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getCacheHits()">getCacheHits</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the number of cache hits.</DL>
</DD>
</DL>
<HR>

<A NAME="getCacheMisses()"><!-- --></A><H3>
getCacheMisses</H3>
<PRE>
public long <B>getCacheMisses</B>()</PRE>
<DL>
<DD>Returns the number of cache misses. A cache miss occurs every
 time the get method is called and the cache does not contain the
 requested object.<p>

 Keeping track of cache hits and misses lets one measure how efficient
 the cache is; the higher the percentage of hits, the more efficient.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getCacheMisses()">getCacheMisses</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the number of cache hits.</DL>
</DD>
</DL>
<HR>

<A NAME="getCacheSize()"><!-- --></A><H3>
getCacheSize</H3>
<PRE>
public int <B>getCacheSize</B>()</PRE>
<DL>
<DD>Returns the size of the cache contents in bytes. This value is only a
 rough approximation, so cache users should expect that actual VM
 memory used by the cache could be significantly higher than the value
 reported by this method.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getCacheSize()">getCacheSize</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the size of the cache contents in bytes.</DL>
</DD>
</DL>
<HR>

<A NAME="getMaxCacheSize()"><!-- --></A><H3>
getMaxCacheSize</H3>
<PRE>
public long <B>getMaxCacheSize</B>()</PRE>
<DL>
<DD>Returns the maximum size of the cache (in bytes). If the cache grows larger
 than the max size, the least frequently used items will be removed. If
 the max cache size is set to -1, there is no size limit.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getMaxCacheSize()">getMaxCacheSize</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the maximum size of the cache (-1 indicates unlimited max size).</DL>
</DD>
</DL>
<HR>

<A NAME="setMaxCacheSize(int)"><!-- --></A><H3>
setMaxCacheSize</H3>
<PRE>
public void <B>setMaxCacheSize</B>(int&nbsp;maxCacheSize)</PRE>
<DL>
<DD>Sets the maximum size of the cache. If the cache grows larger
 than the max size, the least frequently used items will be removed. If
 the max cache size is set to -1, there is no size limit.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#setMaxCacheSize(int)">setMaxCacheSize</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>maxCacheSize</CODE> - the maximum size of this cache (-1 indicates unlimited max size).</DL>
</DD>
</DL>
<HR>

<A NAME="getMaxLifetime()"><!-- --></A><H3>
getMaxLifetime</H3>
<PRE>
public long <B>getMaxLifetime</B>()</PRE>
<DL>
<DD>Returns the maximum number of milleseconds that any object can live
 in cache. Once the specified number of milleseconds passes, the object
 will be automatically expried from cache. If the max lifetime is set
 to -1, then objects never expire.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#getMaxLifetime()">getMaxLifetime</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the maximum number of milleseconds before objects are expired.</DL>
</DD>
</DL>
<HR>

<A NAME="setMaxLifetime(long)"><!-- --></A><H3>
setMaxLifetime</H3>
<PRE>
public void <B>setMaxLifetime</B>(long&nbsp;maxLifetime)</PRE>
<DL>
<DD>Sets the maximum number of milleseconds that any object can live
 in cache. Once the specified number of milleseconds passes, the object
 will be automatically expried from cache. If the max lifetime is set
 to -1, then objects never expire.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html#setMaxLifetime(long)">setMaxLifetime</A></CODE> in interface <CODE><A HREF="../../../../org/jivesoftware/util/cache/Cache.html" title="interface in org.jivesoftware.util.cache">Cache</A>&lt;<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">K</A>,<A HREF="../../../../org/jivesoftware/util/cache/DefaultCache.html" title="type parameter in DefaultCache">V</A>&gt;</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>maxLifetime</CODE> - the maximum number of milleseconds before objects are expired.</DL>
</DD>
</DL>
<HR>

<A NAME="deleteExpiredEntries()"><!-- --></A><H3>
deleteExpiredEntries</H3>
<PRE>
protected void <B>deleteExpiredEntries</B>()</PRE>
<DL>
<DD>Clears all entries out of cache where the entries are older than the
 maximum defined age.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="cullCache()"><!-- --></A><H3>
cullCache</H3>
<PRE>
protected final void <B>cullCache</B>()</PRE>
<DL>
<DD>Removes objects from cache if the cache is too full. "Too full" is
 defined as within 3% of the maximum cache size. Whenever the cache is
 is too big, the least frequently used elements are deleted until the
 cache is at least 10% empty.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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