org.apache.hadoop.hdfs.protocolPB.JournalProtocolServerSideTranslatorPB Maven / Gradle / Ivy
/**
* 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.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.FenceRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.FenceResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.JournalRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.JournalResponseProto;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.StartLogSegmentRequestProto;
import org.apache.hadoop.hdfs.protocol.proto.JournalProtocolProtos.StartLogSegmentResponseProto;
import org.apache.hadoop.hdfs.server.protocol.FenceResponse;
import org.apache.hadoop.hdfs.server.protocol.JournalProtocol;
import org.apache.hadoop.thirdparty.protobuf.RpcController;
import org.apache.hadoop.thirdparty.protobuf.ServiceException;
/**
* Implementation for protobuf service that forwards requests
* received on {@link JournalProtocolPB} to the
* {@link JournalProtocol} server implementation.
*/
@InterfaceAudience.Private
public class JournalProtocolServerSideTranslatorPB implements JournalProtocolPB {
/** Server side implementation to delegate the requests to */
private final JournalProtocol impl;
private final static JournalResponseProto VOID_JOURNAL_RESPONSE =
JournalResponseProto.newBuilder().build();
private final static StartLogSegmentResponseProto
VOID_START_LOG_SEGMENT_RESPONSE =
StartLogSegmentResponseProto.newBuilder().build();
public JournalProtocolServerSideTranslatorPB(JournalProtocol impl) {
this.impl = impl;
}
/** @see JournalProtocol#journal */
@Override
public JournalResponseProto journal(RpcController unused,
JournalRequestProto req) throws ServiceException {
try {
impl.journal(PBHelper.convert(req.getJournalInfo()), req.getEpoch(),
req.getFirstTxnId(), req.getNumTxns(), req.getRecords().toByteArray());
} catch (IOException e) {
throw new ServiceException(e);
}
return VOID_JOURNAL_RESPONSE;
}
/** @see JournalProtocol#startLogSegment */
@Override
public StartLogSegmentResponseProto startLogSegment(RpcController controller,
StartLogSegmentRequestProto req) throws ServiceException {
try {
impl.startLogSegment(PBHelper.convert(req.getJournalInfo()),
req.getEpoch(), req.getTxid());
} catch (IOException e) {
throw new ServiceException(e);
}
return VOID_START_LOG_SEGMENT_RESPONSE;
}
@Override
public FenceResponseProto fence(RpcController controller,
FenceRequestProto req) throws ServiceException {
try {
FenceResponse resp = impl.fence(PBHelper.convert(req.getJournalInfo()), req.getEpoch(),
req.getFencerInfo());
return FenceResponseProto.newBuilder().setInSync(resp.isInSync())
.setLastTransactionId(resp.getLastTransactionId())
.setPreviousEpoch(resp.getPreviousEpoch()).build();
} catch (IOException e) {
throw new ServiceException(e);
}
}
}