ucar.nc2.util.cache
Class FileCacheRaf

java.lang.Object
  ucar.nc2.util.cache.FileCacheRaf

public class FileCacheRaf
extends java.lang.Object

Keep cache of open RandomAccessFile, for performance. Used by TDS to optimize serving netCDF files over HTTP.

 RandomAccessFile raf = null;
 try {
 RandomAccessFile raf = FileCache.acquire(location, cancelTask);
 ...
 } finally {
 FileCache.release( raf)
 }
 

Library ships with cache disabled. If you want to use, call init() and make sure you call exit() when exiting program. All methods are thread safe. Cleanup is done automatically in a background thread, using LRU.

Author:

jcaron

Nested Class Summary

class

FileCacheRaf.Raf

Constructor Summary

FileCacheRaf(int minElementsInMemory, int maxElementsInMemory, int period)

Method Summary

FileCacheRaf.Raf	acquire(java.lang.String filename)
void	clearCache(boolean force)
java.util.Collection	getCache()
void	release(FileCacheRaf.Raf craf)
static void	shutdown()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FileCacheRaf

public FileCacheRaf(int minElementsInMemory,
                    int maxElementsInMemory,
                    int period)

Method Detail

clearCache

public void clearCache(boolean force)

getCache

public java.util.Collection getCache()

shutdown

public static void shutdown()

acquire

public FileCacheRaf.Raf acquire(java.lang.String filename)
                         throws java.io.IOException

Throws:

java.io.IOException

release

public void release(FileCacheRaf.Raf craf)
             throws java.io.IOException

Throws:

java.io.IOException