/**
* 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;
import org.apache.tez.runtime.common.objectregistry.ObjectRegistryImpl;
@InterfaceAudience.Private
public class ObjectCache {
private static final Log LOG = LogFactory.getLog(ObjectCache.class);
private final ObjectRegistry registry = new ObjectRegistryImpl();
private static ObjectCache cache = new ObjectCache();
private ObjectCache() {
}
public static ObjectCache getInstance() {
return cache;
}
public void cache(String key, Object value) {
LOG.info("Adding " + key + " to cache");
registry.cacheForVertex(key, value);
}
public Object retrieve(String key) {
Object o = registry.get(key);
if (o != null) {
LOG.info("Found " + key + " in cache");
}
return o;
}
}