| /** |
| * 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.nutch.util; |
| |
| import java.lang.invoke.MethodHandles; |
| import java.util.HashMap; |
| import java.util.WeakHashMap; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.conf.Configuration; |
| |
| public class ObjectCache { |
| |
| private static final Logger LOG = LoggerFactory |
| .getLogger(MethodHandles.lookup().lookupClass()); |
| |
| private static final WeakHashMap<Configuration, ObjectCache> CACHE = new WeakHashMap<>(); |
| |
| private final HashMap<String, Object> objectMap; |
| |
| private ObjectCache() { |
| objectMap = new HashMap<>(); |
| } |
| |
| public synchronized static ObjectCache get(Configuration conf) { |
| ObjectCache objectCache = CACHE.get(conf); |
| if (objectCache == null) { |
| LOG.debug("No object cache found for conf=" + conf |
| + ", instantiating a new object cache"); |
| objectCache = new ObjectCache(); |
| CACHE.put(conf, objectCache); |
| } |
| return objectCache; |
| } |
| |
| public synchronized Object getObject(String key) { |
| return objectMap.get(key); |
| } |
| |
| public synchronized void setObject(String key, Object value) { |
| objectMap.put(key, value); |
| } |
| } |