/**
* 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.hadoop.hive.ql.exec.tez;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.exec.ObjectCache;
import org.apache.hadoop.hive.ql.exec.ObjectCacheFactory;
/**
* Access to the Object cache from Tez, along with utility methods for accessing specific Keys.
*/
public class TezCacheAccess {
private TezCacheAccess(ObjectCache cache) {
this.cache = cache;
}
private ObjectCache cache;
public static TezCacheAccess createInstance(Configuration conf) {
ObjectCache cache = ObjectCacheFactory.getCache(conf);
return new TezCacheAccess(cache);
}
private static final String CACHED_INPUT_KEY = "CACHED_INPUTS";
private final ReentrantLock cachedInputLock = new ReentrantLock();
public boolean isInputCached(String inputName) {
this.cachedInputLock.lock();
try {
@SuppressWarnings("unchecked")
Set<String> cachedInputs = (Set<String>) cache.retrieve(CACHED_INPUT_KEY);
if (cachedInputs == null) {
return false;
} else {
return cachedInputs.contains(inputName);
}
} finally {
this.cachedInputLock.unlock();
}
}
public void registerCachedInput(String inputName) {
this.cachedInputLock.lock();
try {
@SuppressWarnings("unchecked")
Set<String> cachedInputs = (Set<String>) cache.retrieve(CACHED_INPUT_KEY);
if (cachedInputs == null) {
cachedInputs = Collections.newSetFromMap(new ConcurrentHashMap<String, Boolean>());
cache.cache(CACHED_INPUT_KEY, cachedInputs);
}
cachedInputs.add(inputName);
} finally {
this.cachedInputLock.unlock();
}
}
}