cache.html

jxta的api库

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<A NAME="Cache(long, net.jxta.impl.util.CacheEntryListener)"><!-- --></A><H3>
Cache</H3>
<PRE>
public <B>Cache</B>(long&nbsp;maxSize,
             <A HREF="../../../../net/jxta/impl/util/CacheEntryListener.html" title="interface in net.jxta.impl.util">CacheEntryListener</A>&nbsp;listener)</PRE>
<DL>
<DD>Creates a cache whih will keep at most maxSize purgeable entries.
 Every new entry is purgeable by default.
 Entries that are not purgeable are not counted and are never removed
 unless clear() or remove() is called. Purgeable entries are removed
 silently as needed to make room for new entries so that the number
 of purgeable entries remains < maxSize.
 Entries prugeability is controlled by invoking the sticky() method
 or the stickyCacheEntry() method.
 For now, purged entries are abandonned to the GC which is probably not
 so bad. To permit acceleration of the collection of resources, a
 purge listener will be added soon.
<P>
</DL>

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<A NAME="clear()"><!-- --></A><H3>
clear</H3>
<PRE>
public void <B>clear</B>()</PRE>
<DL>
<DD>Empties the cache completely.
 The entries are abandonned to the GC.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="purge(int)"><!-- --></A><H3>
purge</H3>
<PRE>
public void <B>purge</B>(int&nbsp;fraction)</PRE>
<DL>
<DD>Purges some of the cache. 
 The entries are cleaned-up properly.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="putCacheEntry(java.lang.Object, net.jxta.impl.util.CacheEntry)"><!-- --></A><H3>
putCacheEntry</H3>
<PRE>
protected <A HREF="../../../../net/jxta/impl/util/CacheEntry.html" title="interface in net.jxta.impl.util">CacheEntry</A> <B>putCacheEntry</B>(java.lang.Object&nbsp;key,
                                   <A HREF="../../../../net/jxta/impl/util/CacheEntry.html" title="interface in net.jxta.impl.util">CacheEntry</A>&nbsp;value)</PRE>
<DL>
<DD>Inserts the given cache entry directly.
 Returns the previous cache entry associated with the given key, if any.
 Not exposed yet. Should not be a problem to expose it, but it is not
 needed yet.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="put(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
put</H3>
<PRE>
public java.lang.Object <B>put</B>(java.lang.Object&nbsp;key,
                            java.lang.Object&nbsp;value)</PRE>
<DL>
<DD>Create a cache entry to hold the given value, and insert it.
 Returns the previous value associated with the given key, if any.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="removeCacheEntry(java.lang.Object)"><!-- --></A><H3>
removeCacheEntry</H3>
<PRE>
protected <A HREF="../../../../net/jxta/impl/util/CacheEntry.html" title="interface in net.jxta.impl.util">CacheEntry</A> <B>removeCacheEntry</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD>Remove the value, if any, and cacheEntry associated with the given key.
 return the cacheEntry that has been removed.
 Not exposed yet. Should not be a problem to expose it, but it is not
 needed yet.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="remove(java.lang.Object)"><!-- --></A><H3>
remove</H3>
<PRE>
public java.lang.Object <B>remove</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD>Remove the value, if any, and cacheEntry associated with the given key.
 returns the value that has been removed.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getCacheEntry(java.lang.Object)"><!-- --></A><H3>
getCacheEntry</H3>
<PRE>
public <A HREF="../../../../net/jxta/impl/util/CacheEntry.html" title="interface in net.jxta.impl.util">CacheEntry</A> <B>getCacheEntry</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD>Return the cache entry, if any, associated with the given key.
 This is public; it improves performance by letting the application
 do a single lookup instead of two when it needs to find an object in
 the cache and then change its purgeability.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="get(java.lang.Object)"><!-- --></A><H3>
get</H3>
<PRE>
public java.lang.Object <B>get</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD>Return the value, if any associated with the given key.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="stickyCacheEntry(net.jxta.impl.util.CacheEntry, boolean)"><!-- --></A><H3>
stickyCacheEntry</H3>
<PRE>
public void <B>stickyCacheEntry</B>(<A HREF="../../../../net/jxta/impl/util/CacheEntry.html" title="interface in net.jxta.impl.util">CacheEntry</A>&nbsp;ce,
                             boolean&nbsp;sticky)</PRE>
<DL>
<DD>Change the purgeability of the given cacheEntry.
 If sticky is true, the entry cannot be purged.
 Note: if the CacheEntry is known, it is more efficient to use this
 method than sticky(), since sticky will preform a hashmap lookup
 to locate the cache entry.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="sticky(java.lang.Object, boolean)"><!-- --></A><H3>
sticky</H3>
<PRE>
public void <B>sticky</B>(java.lang.Object&nbsp;key,
                   boolean&nbsp;sticky)</PRE>
<DL>
<DD>Force the value associated with the given key to be purgeable or
 non-purgeable from the cache (non-sticky vs. sticky).
 Note: Most often, a call to the get() method will be performed
 before it can be decided to invoke sticky(). Whenever this is the case
 it is better to invoke getCacheEntry() + getValue() and then
 stickyCacheEntry() since that eliminates one hashmap lookup.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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