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BlockWorkerClientPool.java
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BlockWorkerClientPool.java
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/*
* Licensed to the University of California, Berkeley 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 tachyon.client.block;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import tachyon.Constants;
import tachyon.client.ClientContext;
import tachyon.resource.ResourcePool;
import tachyon.client.ResourcePool;
import tachyon.conf.TachyonConf;
import tachyon.thrift.NetAddress;
import tachyon.util.ThreadFactoryUtils;
import tachyon.worker.ClientMetrics;
import tachyon.worker.WorkerClient;
/**
* Class for managing local block worker clients. After obtaining a client with {@link
* ResourcePool#acquire}, {@link ResourcePool#release} must be called when the thread is done
* using the client.
*/
public final class BlockWorkerClientPool extends ResourcePool<WorkerClient> {
/**
* The capacity for this pool must be large, since each block written will hold a client until
* the block is committed at the end of the file completion.
*/
private final ExecutorService mExecutorService;
private final NetAddress mWorkerNetAddress;
private final int mMaxCapacity;
/**
* Creates a new block worker client pool.
*
* @param workerAddress the worker address
*/
public BlockWorkerClientPool(NetAddress workerAddress) {
super(ClientContext.getConf().getInt(Constants.USER_LOCAL_BLOCK_WORKER_CLIENT_THREADS));
mMaxCapacity = ClientContext.getConf().getInt(Constants.USER_LOCAL_BLOCK_WORKER_CLIENT_THREADS);
mExecutorService = Executors.newFixedThreadPool(mMaxCapacity, ThreadFactoryUtils.build(
"block-worker-heartbeat-%d", true));
mWorkerNetAddress = workerAddress;
}
@Override
public void close() {
// TODO(calvin): Consider collecting all the clients and shutting them down.
mExecutorService.shutdown();
}
@Override
public void release(WorkerClient workerClient) {
workerClient.createNewSession(ClientContext.getRandomNonNegativeLong());
super.release(workerClient);
}
@Override
protected WorkerClient createNewResource() {
long clientId = ClientContext.getRandomNonNegativeLong();
return new WorkerClient(mWorkerNetAddress, mExecutorService, ClientContext.getConf(),
clientId, true, new ClientMetrics());
}
}