/**
* 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.hdfs.protocolPB;
import java.io.Closeable;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.JournalRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.StartLogSegmentRequestProto;
import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
import org.apache.hadoop.ipc.ProtobufHelper;
import org.apache.hadoop.ipc.ProtocolMetaInterface;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.RpcClientUtil;
import com.google.protobuf.RpcController;
import com.google.protobuf.ServiceException;
/**
* This class is the client side translator to translate the requests made on
* {@link JournalProtocol} interfaces to the RPC server implementing
* {@link JournalProtocolPB}.
*/
@InterfaceAudience.Private
@InterfaceStability.Stable
public class JournalProtocolTranslatorPB implements ProtocolMetaInterface,
JournalProtocol, Closeable {
/** RpcController is not used and hence is set to null */
private final static RpcController NULL_CONTROLLER = null;
private final JournalProtocolPB rpcProxy;
public JournalProtocolTranslatorPB(JournalProtocolPB rpcProxy) {
this.rpcProxy = rpcProxy;
}
@Override
public void close() {
RPC.stopProxy(rpcProxy);
}
@Override
public void journal(NamenodeRegistration reg, long firstTxnId,
int numTxns, byte[] records) throws IOException {
JournalRequestProto req = JournalRequestProto.newBuilder()
.setJournalInfo(PBHelper.convertToJournalInfo(reg))
.setFirstTxnId(firstTxnId)
.setNumTxns(numTxns)
.setRecords(PBHelper.getByteString(records))
.build();
try {
rpcProxy.journal(NULL_CONTROLLER, req);
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public void startLogSegment(NamenodeRegistration registration, long txid)
throws IOException {
StartLogSegmentRequestProto req = StartLogSegmentRequestProto.newBuilder()
.setJournalInfo(PBHelper.convertToJournalInfo(registration))
.setTxid(txid)
.build();
try {
rpcProxy.startLogSegment(NULL_CONTROLLER, req);
} catch (ServiceException e) {
throw ProtobufHelper.getRemoteException(e);
}
}
@Override
public boolean isMethodSupported(String methodName) throws IOException {
return RpcClientUtil.isMethodSupported(rpcProxy, JournalProtocolPB.class,
RPC.RpcKind.RPC_PROTOCOL_BUFFER,
RPC.getProtocolVersion(JournalProtocolPB.class), methodName);
}
}