NoCacheImpl.java

/*
 * RED5 Open Source Flash Server - http://code.google.com/p/red5/
 * 
 * Copyright 2006-2012 by respective authors (see below). All rights reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.red5.server.cache;

import java.lang.ref.SoftReference;
import java.util.Iterator;

import org.apache.mina.core.buffer.IoBuffer;
import org.red5.server.api.cache.ICacheStore;
import org.red5.server.api.cache.ICacheable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * Provides an implementation of an object cache which actually
 * does not provide a cache.
 * 
 * @author The Red5 Project (red5@osflash.org)
 * @author Paul Gregoire (mondain@gmail.com)
 */
public class NoCacheImpl implements ICacheStore, ApplicationContextAware {

	protected static Logger log = LoggerFactory.getLogger(NoCacheImpl.class);

	private static NoCacheImpl instance = new NoCacheImpl();
	
	/** Do not instantiate NoCacheImpl. */ 
	/*
	 * This constructor helps to ensure that we are singleton.
	 */
	private NoCacheImpl() {
	}

	/**
	 * Returns the instance of this class.
	 * 
	 * @return class instance
	 */
	public static NoCacheImpl getInstance() {
		return instance;
	}	
	
	// We store the application context in a ThreadLocal so we can access it
	// later.
	private static ApplicationContext applicationContext = null;

	/** {@inheritDoc} */
    public void setApplicationContext(ApplicationContext context)
			throws BeansException {
		NoCacheImpl.applicationContext = context;
	}

	/**
     * Getter for property 'applicationContext'.
     *
     * @return Value for property 'applicationContext'.
     */
    public static ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	/** {@inheritDoc} */
    public Iterator<String> getObjectNames() {
		return null;
	}

	/** {@inheritDoc} */
    public Iterator<SoftReference<? extends ICacheable>> getObjects() {
		return null;
	}

	public boolean offer(String key, IoBuffer obj) {
		return false;
	}

	/** {@inheritDoc} */
    public boolean offer(String name, Object obj) {
		return false;
	}

	/** {@inheritDoc} */
    public void put(String name, Object obj) {
	}

	/** {@inheritDoc} */
    public ICacheable get(String name) {
		return null;
	}

	/** {@inheritDoc} */
    public boolean remove(ICacheable obj) {
		return false;
	}

	/** {@inheritDoc} */
    public boolean remove(String name) {
	    return false;
	}

	/**
     * Getter for property 'cacheHit'.
     *
     * @return Value for property 'cacheHit'.
     */
    public static long getCacheHit() {
		return 0;
	}

	/**
     * Getter for property 'cacheMiss'.
     *
     * @return Value for property 'cacheMiss'.
     */
    public static long getCacheMiss() {
		return 0;
	}

	/** {@inheritDoc} */
    public void setMaxEntries(int max) {
	}

	/** {@inheritDoc} */
    public void destroy() {
	}
}