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81 lines
2.3 KiB
Java
81 lines
2.3 KiB
Java
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package com.cloud.consoleproxy;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import com.cloud.consoleproxy.util.Logger;
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public class AjaxFIFOImageCache {
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private static final Logger s_logger = Logger.getLogger(AjaxFIFOImageCache.class);
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private List<Integer> fifoQueue;
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private Map<Integer, byte[]> cache;
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private int cacheSize;
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private int nextKey = 1;
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public AjaxFIFOImageCache(int cacheSize) {
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this.cacheSize = cacheSize;
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fifoQueue = new ArrayList<Integer>();
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cache = new HashMap<Integer, byte[]>();
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}
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public synchronized void clear() {
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fifoQueue.clear();
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cache.clear();
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}
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public synchronized int putImage(byte[] image) {
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while(cache.size() >= cacheSize) {
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Integer keyToRemove = fifoQueue.remove(0);
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cache.remove(keyToRemove);
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if(s_logger.isTraceEnabled())
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s_logger.trace("Remove image from cache, key: " + keyToRemove);
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}
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int key = getNextKey();
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if(s_logger.isTraceEnabled())
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s_logger.trace("Add image to cache, key: " + key);
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cache.put(key, image);
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fifoQueue.add(key);
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return key;
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}
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public synchronized byte[] getImage(int key) {
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if(cache.containsKey(key)) {
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if(s_logger.isTraceEnabled())
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s_logger.trace("Retrieve image from cache, key: " + key);
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return cache.get(key);
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}
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if(s_logger.isTraceEnabled())
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s_logger.trace("Image is no long in cache, key: " + key);
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return null;
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}
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public synchronized int getNextKey() {
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return nextKey++;
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}
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}
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