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RetryHandlingMetaMasterClient.java
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RetryHandlingMetaMasterClient.java
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/*
* 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;
import alluxio.AbstractMasterClient;
import alluxio.Constants;
import alluxio.master.MasterInquireClient;
import alluxio.thrift.AlluxioService;
import alluxio.thrift.GetMasterInfoTOptions;
import alluxio.thrift.MetaMasterClientService;
import alluxio.wire.MasterInfo;
import alluxio.wire.MasterInfo.MasterInfoField;
import org.apache.thrift.TException;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import javax.annotation.concurrent.ThreadSafe;
import javax.security.auth.Subject;
/**
* A wrapper for the thrift client to interact with the meta master.
*
* Since thrift clients are not thread safe, this class is a wrapper to provide thread safety and
* support for retries.
*/
@ThreadSafe
public final class RetryHandlingMetaMasterClient extends AbstractMasterClient
implements MetaMasterClient {
private MetaMasterClientService.Client mClient;
/**
* Creates a new meta master client.
*
* @param subject the parent subject, set to null if not present
*/
public RetryHandlingMetaMasterClient(Subject subject) {
super(subject, MasterInquireClient.Factory.create());
}
@Override
protected AlluxioService.Client getClient() {
return mClient;
}
@Override
protected String getServiceName() {
return Constants.META_MASTER_SERVICE_NAME;
}
@Override
protected long getServiceVersion() {
return Constants.META_MASTER_CLIENT_SERVICE_VERSION;
}
@Override
protected void afterConnect() {
mClient = new MetaMasterClientService.Client(mProtocol);
}
@Override
public synchronized MasterInfo getInfo(final Set<MasterInfoField> fields) throws IOException {
return retryRPC(new RpcCallable<MasterInfo>() {
@Override
public MasterInfo call() throws TException {
Set<alluxio.thrift.MasterInfoField> thriftFields = new HashSet<>();
if (fields == null) {
thriftFields = null;
} else {
for (MasterInfoField field : fields) {
thriftFields.add(field.toThrift());
}
}
return MasterInfo.fromThrift(
mClient.getMasterInfo(new GetMasterInfoTOptions(thriftFields)).getMasterInfo());
}
});
}
}