/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.client.block;
import alluxio.Configuration;
import alluxio.PropertyKey;
import alluxio.resource.ResourcePool;
import com.google.common.io.Closer;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import javax.annotation.concurrent.ThreadSafe;
import javax.security.auth.Subject;
/**
* Class for managing block master clients. After obtaining a client with
* {@link ResourcePool#acquire()}, {@link ResourcePool#release(Object)} must be called when the
* thread is done using the client.
*/
@ThreadSafe
public final class BlockMasterClientPool extends ResourcePool<BlockMasterClient> {
private final InetSocketAddress mMasterAddress;
private final Queue<BlockMasterClient> mClientList;
private final Subject mSubject;
/**
* Creates a new block master client pool.
*
* @param subject the parent subject
* @param masterAddress the master address
*/
public BlockMasterClientPool(Subject subject, InetSocketAddress masterAddress) {
super(Configuration.getInt(PropertyKey.USER_BLOCK_MASTER_CLIENT_THREADS));
mSubject = subject;
mMasterAddress = masterAddress;
mClientList = new ConcurrentLinkedQueue<>();
}
/**
* Creates a new block master client pool.
*
* @param subject the parent subject
* @param masterAddress the master address
* @param clientThreads the number of client threads to use
*/
public BlockMasterClientPool(Subject subject, InetSocketAddress masterAddress,
int clientThreads) {
super(clientThreads);
mSubject = subject;
mMasterAddress = masterAddress;
mClientList = new ConcurrentLinkedQueue<>();
}
@Override
public void close() throws IOException {
BlockMasterClient client;
Closer closer = Closer.create();
while ((client = mClientList.poll()) != null) {
closer.register(client);
}
closer.close();
}
@Override
protected BlockMasterClient createNewResource() {
BlockMasterClient client = BlockMasterClient.Factory.create(mSubject, mMasterAddress);
mClientList.add(client);
return client;
}
}