| /** |
| * 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.server.protocol; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableFactories; |
| import org.apache.hadoop.io.WritableFactory; |
| |
| /** |
| * This as a generic distributed upgrade command. |
| * |
| * During the upgrade cluster components send upgrade commands to each other |
| * in order to obtain or share information with them. |
| * It is supposed that each upgrade defines specific upgrade command by |
| * deriving them from this class. |
| * The upgrade command contains version of the upgrade, which is verified |
| * on the receiving side and current status of the upgrade. |
| */ |
| public class UpgradeCommand extends DatanodeCommand { |
| final static int UC_ACTION_UNKNOWN = DatanodeProtocol.DNA_UNKNOWN; |
| public final static int UC_ACTION_REPORT_STATUS = 100; // report upgrade status |
| public final static int UC_ACTION_START_UPGRADE = 101; // start upgrade |
| |
| private int version; |
| private short upgradeStatus; |
| |
| public UpgradeCommand() { |
| super(UC_ACTION_UNKNOWN); |
| this.version = 0; |
| this.upgradeStatus = 0; |
| } |
| |
| public UpgradeCommand(int action, int version, short status) { |
| super(action); |
| this.version = version; |
| this.upgradeStatus = status; |
| } |
| |
| public int getVersion() { |
| return this.version; |
| } |
| |
| public short getCurrentStatus() { |
| return this.upgradeStatus; |
| } |
| |
| ///////////////////////////////////////////////// |
| // Writable |
| ///////////////////////////////////////////////// |
| static { // register a ctor |
| WritableFactories.setFactory |
| (UpgradeCommand.class, |
| new WritableFactory() { |
| public Writable newInstance() { return new UpgradeCommand(); } |
| }); |
| } |
| |
| /** |
| */ |
| public void write(DataOutput out) throws IOException { |
| super.write(out); |
| out.writeInt(this.version); |
| out.writeShort(this.upgradeStatus); |
| } |
| |
| /** |
| */ |
| public void readFields(DataInput in) throws IOException { |
| super.readFields(in); |
| this.version = in.readInt(); |
| this.upgradeStatus = in.readShort(); |
| } |
| } |