| /** |
| * 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.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.StartLogSegmentRequestProto; |
| import org.apache.hadoop.hdfs.server.protocol.FenceResponse; |
| import org.apache.hadoop.hdfs.server.protocol.JournalInfo; |
| import org.apache.hadoop.hdfs.server.protocol.JournalProtocol; |
| 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(JournalInfo journalInfo, long epoch, long firstTxnId, |
| int numTxns, byte[] records) throws IOException { |
| JournalRequestProto req = JournalRequestProto.newBuilder() |
| .setJournalInfo(PBHelper.convert(journalInfo)) |
| .setEpoch(epoch) |
| .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(JournalInfo journalInfo, long epoch, long txid) |
| throws IOException { |
| StartLogSegmentRequestProto req = StartLogSegmentRequestProto.newBuilder() |
| .setJournalInfo(PBHelper.convert(journalInfo)) |
| .setEpoch(epoch) |
| .setTxid(txid) |
| .build(); |
| try { |
| rpcProxy.startLogSegment(NULL_CONTROLLER, req); |
| } catch (ServiceException e) { |
| throw ProtobufHelper.getRemoteException(e); |
| } |
| } |
| |
| @Override |
| public FenceResponse fence(JournalInfo journalInfo, long epoch, |
| String fencerInfo) throws IOException { |
| FenceRequestProto req = FenceRequestProto.newBuilder().setEpoch(epoch) |
| .setJournalInfo(PBHelper.convert(journalInfo)).build(); |
| try { |
| FenceResponseProto resp = rpcProxy.fence(NULL_CONTROLLER, req); |
| return new FenceResponse(resp.getPreviousEpoch(), |
| resp.getLastTransactionId(), resp.getInSync()); |
| } 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); |
| } |
| } |