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/**
* 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.hive.service.server;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.metastore.HiveMetaStore;
import org.apache.hadoop.hive.metastore.RawStore;
/**
* A HiveServer2 thread used to construct new server threads.
* In particular, this thread ensures an orderly cleanup,
* when killed by its corresponding ExecutorService.
*/
public class ThreadWithGarbageCleanup extends Thread {
private static final Log LOG = LogFactory.getLog(ThreadWithGarbageCleanup.class);
Map<Long, RawStore> threadRawStoreMap =
ThreadFactoryWithGarbageCleanup.getThreadRawStoreMap();
public ThreadWithGarbageCleanup(Runnable runnable) {
super(runnable);
}
/**
* Add any Thread specific garbage cleanup code here.
* Currently, it shuts down the RawStore object for this thread if it is not null.
*/
@Override
public void finalize() throws Throwable {
cleanRawStore();
super.finalize();
}
private void cleanRawStore() {
Long threadId = this.getId();
RawStore threadLocalRawStore = threadRawStoreMap.get(threadId);
if (threadLocalRawStore != null) {
LOG.debug("RawStore: " + threadLocalRawStore + ", for the thread: " +
this.getName() + " will be closed now.");
threadLocalRawStore.shutdown();
threadRawStoreMap.remove(threadId);
}
}
/**
* Cache the ThreadLocal RawStore object. Called from the corresponding thread.
*/
public void cacheThreadLocalRawStore() {
Long threadId = this.getId();
RawStore threadLocalRawStore = HiveMetaStore.HMSHandler.getRawStore();
if (threadLocalRawStore != null && !threadRawStoreMap.containsKey(threadId)) {
LOG.debug("Adding RawStore: " + threadLocalRawStore + ", for the thread: " +
this.getName() + " to threadRawStoreMap for future cleanup.");
threadRawStoreMap.put(threadId, threadLocalRawStore);
}
}
}
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