/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.server.distcache;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.MessageDigest;
import com.caucho.distcache.AbstractCache;
import com.caucho.distcache.CacheSerializer;
import com.caucho.distcache.ExtCacheEntry;
import com.caucho.env.distcache.CacheDataBacking;
import com.caucho.util.HashKey;
/**
* Manages the distributed cache
*/
abstract public class DistributedCacheManager
{
/**
* Starts the service
*/
public void start()
{
}
/**
* Called when a cache initializes.
*/
public void initCache(AbstractCache abstractCache)
{
}
/**
* Called when a cache is removed.
*/
public void destroyCache(AbstractCache abstractCache)
{
}
/**
* Gets a cache key entry
*/
abstract public DistCacheEntry getCacheEntry(Object key, CacheConfig config);
/**
* Gets a cache key entry
*/
abstract public DistCacheEntry getCacheEntry(HashKey key, CacheConfig config);
/**
* Sets a cache entry
*/
public void put(HashKey hashKey,
Object value,
CacheConfig config)
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Sets a cache entry
*/
public ExtCacheEntry put(HashKey hashKey,
InputStream is,
CacheConfig config,
long idleTimeout)
throws IOException
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Removes a cache entry
*/
abstract public boolean remove(HashKey hashKey);
abstract public CacheDataBacking getDataBacking();
/**
* For QA
*/
public byte[] calculateValueHash(Object value, CacheConfig config)
{
throw new UnsupportedOperationException(getClass().getName());
}
/**
* Closes the manager
*/
public void close()
{
}
/**
* Returns the key hash
*/
protected HashKey createHashKey(Object key, CacheConfig config)
{
try {
MessageDigest digest
= MessageDigest.getInstance(HashManager.HASH_ALGORITHM);
NullDigestOutputStream dOut = new NullDigestOutputStream(digest);
Object []fullKey = new Object[] { config.getGuid(), key };
config.getKeySerializer().serialize(fullKey, dOut);
HashKey hashKey = new HashKey(dOut.digest());
return hashKey;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Returns the key hash
*/
public HashKey createSelfHashKey(Object key, CacheSerializer keySerializer)
{
try {
MessageDigest digest
= MessageDigest.getInstance(HashManager.HASH_ALGORITHM);
NullDigestOutputStream dOut = new NullDigestOutputStream(digest);
keySerializer.serialize(key, dOut);
HashKey hashKey = new HashKey(dOut.digest());
return hashKey;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public String toString()
{
return getClass().getSimpleName() + "[]";
}
static class NullDigestOutputStream extends OutputStream {
private MessageDigest _digest;
NullDigestOutputStream(MessageDigest digest)
{
_digest = digest;
}
public void write(int value)
{
_digest.update((byte) value);
}
public void write(byte []buffer, int offset, int length)
{
_digest.update(buffer, offset, length);
}
public byte []digest()
{
return _digest.digest();
}
public void flush()
{
}
public void close()
{
}
}
}