org.apache.commons.vfs.cache
Class SoftRefFilesCache

java.lang.Object
  extended by org.apache.commons.vfs.provider.AbstractVfsComponent
      extended by org.apache.commons.vfs.cache.AbstractFilesCache
          extended by org.apache.commons.vfs.cache.SoftRefFilesCache
All Implemented Interfaces:
FilesCache, VfsComponent
Direct Known Subclasses:
WeakRefFilesCache

public class SoftRefFilesCache
extends AbstractFilesCache

This implementation caches every file as long as it is strongly reachable by the java vm. As soon as the vm needs memory - every softly reachable file will be discarded.

Version:
$Revision: 764356 $ $Date: 2005-09-30 09:02:41 +0200 (Fr, 30 Sep 2005) $
Author:
Mario Ivankovits
See Also:
SoftReference

Constructor Summary
SoftRefFilesCache()
           
 
Method Summary
 void clear(FileSystem filesystem)
          purge the entries corresponding to the filesystem.
 void close()
          Closes the provider.
protected  java.lang.ref.Reference createReference(FileObject file, java.lang.ref.ReferenceQueue refqueue)
           
 FileObject getFile(FileSystem filesystem, FileName name)
          retrieve a file from the cache by its name.
protected  java.util.Map getOrCreateFilesystemCache(FileSystem filesystem)
           
 void putFile(FileObject file)
          add a fileobject to the cache.
 void removeFile(FileSystem filesystem, FileName name)
          removes a file from cache.
 void touchFile(FileObject file)
           
 
Methods inherited from class org.apache.commons.vfs.provider.AbstractVfsComponent
getContext, getLogger, init, setContext, setLogger
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SoftRefFilesCache

public SoftRefFilesCache()
Method Detail

putFile

public void putFile(FileObject file)
Description copied from interface: FilesCache
add a fileobject to the cache.

Parameters:
file - the file

createReference

protected java.lang.ref.Reference createReference(FileObject file,
                                                  java.lang.ref.ReferenceQueue refqueue)

getFile

public FileObject getFile(FileSystem filesystem,
                          FileName name)
Description copied from interface: FilesCache
retrieve a file from the cache by its name.

Parameters:
filesystem - The FileSystem.
name - the name
Returns:
the fileobject or null if file is not cached

clear

public void clear(FileSystem filesystem)
Description copied from interface: FilesCache
purge the entries corresponding to the filesystem.

Parameters:
filesystem - The FileSystem.

close

public void close()
Description copied from class: AbstractVfsComponent
Closes the provider. This implementation does nothing.

Specified by:
close in interface FilesCache
Specified by:
close in interface VfsComponent
Overrides:
close in class AbstractVfsComponent

removeFile

public void removeFile(FileSystem filesystem,
                       FileName name)
Description copied from interface: FilesCache
removes a file from cache.

Parameters:
filesystem - filesystem
name - filename

touchFile

public void touchFile(FileObject file)

getOrCreateFilesystemCache

protected java.util.Map getOrCreateFilesystemCache(FileSystem filesystem)


Copyright © 2002-2011 Apache Software Foundation. All Rights Reserved.