| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.tez.runtime.common.objectregistry; |
| |
| import java.util.AbstractMap; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import org.apache.tez.runtime.common.objectregistry.ObjectLifeCycle; |
| import org.apache.tez.runtime.common.objectregistry.ObjectRegistry; |
| |
| import com.google.inject.Singleton; |
| |
| @Singleton |
| public class ObjectRegistryImpl implements ObjectRegistry { |
| |
| private Map<String, Map.Entry<Object, ObjectLifeCycle>> objectCache = |
| new HashMap<String, Map.Entry<Object, ObjectLifeCycle>>(); |
| |
| @Override |
| public synchronized Object add(ObjectLifeCycle lifeCycle, |
| String key, Object value) { |
| Map.Entry<Object, ObjectLifeCycle> oldEntry = |
| objectCache.put(key, |
| new AbstractMap.SimpleImmutableEntry<Object, ObjectLifeCycle>( |
| value, lifeCycle)); |
| return oldEntry != null ? oldEntry.getKey() : null; |
| } |
| |
| @Override |
| public synchronized Object get(String key) { |
| Map.Entry<Object, ObjectLifeCycle> entry = |
| objectCache.get(key); |
| return entry != null ? entry.getKey() : null; |
| } |
| |
| @Override |
| public synchronized boolean delete(String key) { |
| return (null != objectCache.remove(key)); |
| } |
| |
| public synchronized void clearCache(ObjectLifeCycle lifeCycle) { |
| for (Entry<String, Entry<Object, ObjectLifeCycle>> entry : |
| objectCache.entrySet()) { |
| if (entry.getValue().getValue().equals(lifeCycle)) { |
| objectCache.remove(entry.getKey()); |
| } |
| } |
| } |
| |
| } |