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org.apache.jetspeed.cache.disk
Class JetspeedDiskCache

java.lang.Object
  org.apache.jetspeed.cache.disk.JetspeedDiskCache

All Implemented Interfaces:

DiskCache

public class JetspeedDiskCache

extends java.lang.Object

implements DiskCache

Sample Implementation of the Disk Cache interface.

Entries are updated when DiskCacheDaemon runs

Version:

$Id: JetspeedDiskCache.java,v 1.50 2004/02/23 02:45:29 jford Exp $

Author:

Kevin A. Burton, Santiago Gala

See Also:

DiskCache, DiskCacheDaemon

Field Summary

static java.lang.String

DEFAULT_CACHE_DIRECTORY The default cache folder

Method Summary

void	add(java.lang.String url) Add this URL to the disk cache
void	add(java.lang.String url, boolean force)
java.lang.String	fetch(java.lang.String url, java.lang.String cache) Get the URL from the Internet and then place it in the File dest.
java.lang.String	fetch(java.lang.String url, java.lang.String cache, boolean force) Pulls in the remote URL from the net and saves it to disk
DiskCacheEntry[]	getEntries() Get a list of all the documents within the cache...
DiskCacheEntry	getEntry(java.lang.String url) Take the given remove URL and place it in the disk cache.
DiskCacheEntry	getEntry(java.lang.String url, boolean force) Force this URL to update
DiskCacheEntry	getEntry(java.lang.String url, java.io.Reader is) Get an Entry given a Reader and the URL from which it has been fetched.
static JetspeedDiskCache	getInstance() Return the default instance of the JetspeedDiskCache cache.
static JetspeedDiskCache	getInstance(java.lang.String directory) Return the default instance of the JetspeedDiskCache cache.
java.lang.String	getRoot() Return the root of this DiskCache
boolean	isCached(java.lang.String url) Ask if a url is in the DiskCache
void	refresh(java.lang.String url) Tell the DiskCache that this URL should be refreshed.
void	remove(java.lang.String url) Remove this URL from the disk cache.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_CACHE_DIRECTORY

public static java.lang.String DEFAULT_CACHE_DIRECTORY

The default cache folder

Method Detail

getEntries

public DiskCacheEntry[] getEntries()

Get a list of all the documents within the cache... Modified to create the entries in the hashtable...

Specified by:

getEntries in interface DiskCache

See Also:

DiskCache.getEntries()

getRoot

public java.lang.String getRoot()

Return the root of this DiskCache

Specified by:

getRoot in interface DiskCache

See Also:

DiskCache.getRoot()

getEntry

public DiskCacheEntry getEntry(java.lang.String url)
                        throws java.io.IOException

Description copied from interface: DiskCache

Take the given remove URL and place it in the disk cache. Additionaly operations include building a DiskCacheEntry and then returning it.

getEntry may attempt to pull down the URL if it is not in the disk cache. Most implementations may provide support for changing this behavior so that you have to explicitly call add. This is done for performance reasons so that HTTP clients don't end up triggering a URL connection to fetch the given URL.

Specified by:

getEntry in interface DiskCache

Throws:

java.io.IOException

See Also:

DiskCache.getEntry( String url )

getEntry

public DiskCacheEntry getEntry(java.lang.String url,
                               boolean force)
                        throws java.io.IOException

Force this URL to update

Specified by:

getEntry in interface DiskCache

Throws:

java.io.IOException

See Also:

DiskCache.getEntry( String url )

getEntry

public DiskCacheEntry getEntry(java.lang.String url,
                               java.io.Reader is)
                        throws java.io.IOException

Get an Entry given a Reader and the URL from which it has been fetched.

Specified by:

getEntry in interface DiskCache

Throws:

java.io.IOException

See Also:

DiskCache.getEntry( String url, Reader is )

remove

public void remove(java.lang.String url)
            throws java.io.IOException

Description copied from interface: DiskCache

Remove this URL from the disk cache.

Specified by:

remove in interface DiskCache

Throws:

java.io.IOException

See Also:

DiskCache.remove( String url )

add

public void add(java.lang.String url)
         throws java.io.IOException

Description copied from interface: DiskCache

Add this URL to the disk cache

Specified by:

add in interface DiskCache

Throws:

java.io.IOException

See Also:

DiskCache.add( String url )

add

public void add(java.lang.String url,
                boolean force)
         throws java.io.IOException

Throws:

java.io.IOException

See Also:

DiskCache.add( String url )

fetch

public java.lang.String fetch(java.lang.String url,
                              java.lang.String cache)
                       throws java.io.IOException

Description copied from interface: DiskCache

Get the URL from the Internet and then place it in the File dest.

Specified by:

fetch in interface DiskCache

Parameters:

url - the url to retrieve

cache - what file to store it in.

Throws:

java.io.IOException

See Also:

DiskCache.fetch( String url, String cache )

fetch

public java.lang.String fetch(java.lang.String url,
                              java.lang.String cache,
                              boolean force)
                       throws java.io.IOException

Pulls in the remote URL from the net and saves it to disk

Parameters:

url - the url to retrieve

cache - what file to store it in.

Throws:

java.io.IOException

See Also:

DiskCache.fetch( String url, String cache )

refresh

public void refresh(java.lang.String url)

Description copied from interface: DiskCache

Tell the DiskCache that this URL should be refreshed. This will do this in a threaded and asynchronous manner.

Specified by:

refresh in interface DiskCache

See Also:

DiskCache.refresh(java.lang.String)

getInstance

public static JetspeedDiskCache getInstance()

Return the default instance of the JetspeedDiskCache cache.

getInstance

public static JetspeedDiskCache getInstance(java.lang.String directory)

Return the default instance of the JetspeedDiskCache cache.

isCached

public boolean isCached(java.lang.String url)

Description copied from interface: DiskCache

Ask if a url is in the DiskCache

Specified by:

isCached in interface DiskCache