// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License. Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
//
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.consoleproxy;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.cloud.consoleproxy.util.Logger;
public class AjaxFIFOImageCache {
private static final Logger s_logger = Logger.getLogger(AjaxFIFOImageCache.class);
private List<Integer> fifoQueue;
private Map<Integer, byte[]> cache;
private int cacheSize;
private int nextKey = 1;
public AjaxFIFOImageCache(int cacheSize) {
this.cacheSize = cacheSize;
fifoQueue = new ArrayList<Integer>();
cache = new HashMap<Integer, byte[]>();
}
public synchronized void clear() {
fifoQueue.clear();
cache.clear();
}
public synchronized int putImage(byte[] image) {
while(cache.size() >= cacheSize) {
Integer keyToRemove = fifoQueue.remove(0);
cache.remove(keyToRemove);
if(s_logger.isTraceEnabled())
s_logger.trace("Remove image from cache, key: " + keyToRemove);
}
int key = getNextKey();
if(s_logger.isTraceEnabled())
s_logger.trace("Add image to cache, key: " + key);
cache.put(key, image);
fifoQueue.add(key);
return key;
}
public synchronized byte[] getImage(int key) {
if(cache.containsKey(key)) {
if(s_logger.isTraceEnabled())
s_logger.trace("Retrieve image from cache, key: " + key);
return cache.get(key);
}
if(s_logger.isTraceEnabled())
s_logger.trace("Image is no long in cache, key: " + key);
return null;
}
public synchronized int getNextKey() {
return nextKey++;
}
}