| /** |
| * 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.protocol.datatransfer; |
| |
| import static org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.fromProto; |
| import static org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.fromProtos; |
| import static org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed; |
| import static org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.fromProto; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpBlockChecksumProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpCopyBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpReadBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpReplaceBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpTransferBlockProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.OpWriteBlockProto; |
| |
| /** Receiver */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public abstract class Receiver implements DataTransferProtocol { |
| protected final DataInputStream in; |
| |
| /** Create a receiver for DataTransferProtocol with a socket. */ |
| protected Receiver(final DataInputStream in) { |
| this.in = in; |
| } |
| |
| /** Read an Op. It also checks protocol version. */ |
| protected final Op readOp() throws IOException { |
| final short version = in.readShort(); |
| if (version != DataTransferProtocol.DATA_TRANSFER_VERSION) { |
| throw new IOException( "Version Mismatch (Expected: " + |
| DataTransferProtocol.DATA_TRANSFER_VERSION + |
| ", Received: " + version + " )"); |
| } |
| return Op.read(in); |
| } |
| |
| /** Process op by the corresponding method. */ |
| protected final void processOp(Op op) throws IOException { |
| switch(op) { |
| case READ_BLOCK: |
| opReadBlock(); |
| break; |
| case WRITE_BLOCK: |
| opWriteBlock(in); |
| break; |
| case REPLACE_BLOCK: |
| opReplaceBlock(in); |
| break; |
| case COPY_BLOCK: |
| opCopyBlock(in); |
| break; |
| case BLOCK_CHECKSUM: |
| opBlockChecksum(in); |
| break; |
| case TRANSFER_BLOCK: |
| opTransferBlock(in); |
| break; |
| default: |
| throw new IOException("Unknown op " + op + " in data stream"); |
| } |
| } |
| |
| /** Receive OP_READ_BLOCK */ |
| private void opReadBlock() throws IOException { |
| OpReadBlockProto proto = OpReadBlockProto.parseFrom(vintPrefixed(in)); |
| readBlock(fromProto(proto.getHeader().getBaseHeader().getBlock()), |
| fromProto(proto.getHeader().getBaseHeader().getToken()), |
| proto.getHeader().getClientName(), |
| proto.getOffset(), |
| proto.getLen()); |
| } |
| |
| /** Receive OP_WRITE_BLOCK */ |
| private void opWriteBlock(DataInputStream in) throws IOException { |
| final OpWriteBlockProto proto = OpWriteBlockProto.parseFrom(vintPrefixed(in)); |
| writeBlock(fromProto(proto.getHeader().getBaseHeader().getBlock()), |
| fromProto(proto.getHeader().getBaseHeader().getToken()), |
| proto.getHeader().getClientName(), |
| fromProtos(proto.getTargetsList()), |
| fromProto(proto.getSource()), |
| fromProto(proto.getStage()), |
| proto.getPipelineSize(), |
| proto.getMinBytesRcvd(), proto.getMaxBytesRcvd(), |
| proto.getLatestGenerationStamp()); |
| } |
| |
| /** Receive {@link Op#TRANSFER_BLOCK} */ |
| private void opTransferBlock(DataInputStream in) throws IOException { |
| final OpTransferBlockProto proto = |
| OpTransferBlockProto.parseFrom(vintPrefixed(in)); |
| transferBlock(fromProto(proto.getHeader().getBaseHeader().getBlock()), |
| fromProto(proto.getHeader().getBaseHeader().getToken()), |
| proto.getHeader().getClientName(), |
| fromProtos(proto.getTargetsList())); |
| } |
| |
| /** Receive OP_REPLACE_BLOCK */ |
| private void opReplaceBlock(DataInputStream in) throws IOException { |
| OpReplaceBlockProto proto = OpReplaceBlockProto.parseFrom(vintPrefixed(in)); |
| replaceBlock(fromProto(proto.getHeader().getBlock()), |
| fromProto(proto.getHeader().getToken()), |
| proto.getDelHint(), |
| fromProto(proto.getSource())); |
| } |
| |
| /** Receive OP_COPY_BLOCK */ |
| private void opCopyBlock(DataInputStream in) throws IOException { |
| OpCopyBlockProto proto = OpCopyBlockProto.parseFrom(vintPrefixed(in)); |
| copyBlock(fromProto(proto.getHeader().getBlock()), |
| fromProto(proto.getHeader().getToken())); |
| } |
| |
| /** Receive OP_BLOCK_CHECKSUM */ |
| private void opBlockChecksum(DataInputStream in) throws IOException { |
| OpBlockChecksumProto proto = OpBlockChecksumProto.parseFrom(vintPrefixed(in)); |
| |
| blockChecksum(fromProto(proto.getHeader().getBlock()), |
| fromProto(proto.getHeader().getToken())); |
| } |
| } |