| /** |
| * 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.pig.backend.hadoop.executionengine.tez.runtime; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.tez.runtime.api.ObjectRegistry; |
| |
| @InterfaceAudience.Public |
| public class ObjectCache { |
| |
| private static final Log LOG = LogFactory.getLog(ObjectCache.class); |
| private static ObjectCache cache = new ObjectCache(); |
| |
| private ObjectRegistry registry; |
| |
| private ObjectCache() { |
| } |
| |
| public static ObjectCache getInstance() { |
| return cache; |
| } |
| |
| /** |
| * Returns the tez ObjectRegistry which allows caching of objects at the |
| * Session, DAG and Vertex level on container reuse for better performance |
| * and savings |
| */ |
| public ObjectRegistry getObjectRegistry() { |
| return registry; |
| } |
| |
| /** |
| * For internal use only. This method to be called only by PigProcessor |
| */ |
| @InterfaceAudience.Private |
| void setObjectRegistry(ObjectRegistry registry) { |
| this.registry = registry; |
| } |
| |
| /** |
| * Convenience method to cache objects in ObjectRegistry for a vertex |
| */ |
| public void cache(String key, Object value) { |
| LOG.info("Adding " + key + " to cache"); |
| registry.cacheForVertex(key, value); |
| } |
| |
| /** |
| * Convenience method to retrieve objects cached for the vertex from ObjectRegistry |
| */ |
| public Object retrieve(String key) { |
| Object o = registry.get(key); |
| if (o != null) { |
| LOG.info("Found " + key + " in cache"); |
| } |
| return o; |
| } |
| } |