| /** |
| * 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.hdfs.protocol.FSConstants; |
| import org.apache.hadoop.hdfs.server.common.Storage; |
| import org.apache.hadoop.hdfs.server.common.StorageInfo; |
| import org.apache.hadoop.io.UTF8; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableFactories; |
| import org.apache.hadoop.io.WritableFactory; |
| |
| /** |
| * NamespaceInfo is returned by the name-node in reply |
| * to a data-node handshake. |
| * |
| */ |
| public class NamespaceInfo extends StorageInfo implements Writable { |
| String buildVersion; |
| int distributedUpgradeVersion; |
| |
| public NamespaceInfo() { |
| super(); |
| buildVersion = null; |
| } |
| |
| public NamespaceInfo(int nsID, long cT, int duVersion) { |
| super(FSConstants.LAYOUT_VERSION, nsID, cT); |
| buildVersion = Storage.getBuildVersion(); |
| this.distributedUpgradeVersion = duVersion; |
| } |
| |
| public String getBuildVersion() { |
| return buildVersion; |
| } |
| |
| public int getDistributedUpgradeVersion() { |
| return distributedUpgradeVersion; |
| } |
| |
| ///////////////////////////////////////////////// |
| // Writable |
| ///////////////////////////////////////////////// |
| static { // register a ctor |
| WritableFactories.setFactory |
| (NamespaceInfo.class, |
| new WritableFactory() { |
| public Writable newInstance() { return new NamespaceInfo(); } |
| }); |
| } |
| |
| public void write(DataOutput out) throws IOException { |
| UTF8.writeString(out, getBuildVersion()); |
| out.writeInt(getLayoutVersion()); |
| out.writeInt(getNamespaceID()); |
| out.writeLong(getCTime()); |
| out.writeInt(getDistributedUpgradeVersion()); |
| } |
| |
| public void readFields(DataInput in) throws IOException { |
| buildVersion = UTF8.readString(in); |
| layoutVersion = in.readInt(); |
| namespaceID = in.readInt(); |
| cTime = in.readLong(); |
| distributedUpgradeVersion = in.readInt(); |
| } |
| } |