| /** |
| * 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.vintPrefixed; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Arrays; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.PipelineAckProto; |
| import org.apache.hadoop.hdfs.protocol.proto.DataTransferProtos.Status; |
| |
| /** Pipeline Acknowledgment **/ |
| @InterfaceAudience.Private |
| @InterfaceStability.Evolving |
| public class PipelineAck { |
| PipelineAckProto proto; |
| public final static long UNKOWN_SEQNO = -2; |
| |
| /** default constructor **/ |
| public PipelineAck() { |
| } |
| |
| /** |
| * Constructor |
| * @param seqno sequence number |
| * @param replies an array of replies |
| */ |
| public PipelineAck(long seqno, Status[] replies) { |
| proto = PipelineAckProto.newBuilder() |
| .setSeqno(seqno) |
| .addAllStatus(Arrays.asList(replies)) |
| .build(); |
| } |
| |
| /** |
| * Get the sequence number |
| * @return the sequence number |
| */ |
| public long getSeqno() { |
| return proto.getSeqno(); |
| } |
| |
| /** |
| * Get the number of replies |
| * @return the number of replies |
| */ |
| public short getNumOfReplies() { |
| return (short)proto.getStatusCount(); |
| } |
| |
| /** |
| * get the ith reply |
| * @return the the ith reply |
| */ |
| public Status getReply(int i) { |
| return proto.getStatus(i); |
| } |
| |
| /** |
| * Check if this ack contains error status |
| * @return true if all statuses are SUCCESS |
| */ |
| public boolean isSuccess() { |
| for (DataTransferProtos.Status reply : proto.getStatusList()) { |
| if (reply != DataTransferProtos.Status.SUCCESS) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /**** Writable interface ****/ |
| public void readFields(InputStream in) throws IOException { |
| proto = PipelineAckProto.parseFrom(vintPrefixed(in)); |
| } |
| |
| public void write(OutputStream out) throws IOException { |
| proto.writeDelimitedTo(out); |
| } |
| |
| @Override //Object |
| public String toString() { |
| return proto.toString(); |
| } |
| } |