| /** |
| * 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.yarn.server.resourcemanager.recovery.records; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.yarn.proto.YarnServerResourceManagerRecoveryProtos.EpochProto; |
| import org.apache.hadoop.yarn.util.Records; |
| |
| /** |
| * The epoch information of RM for work-preserving restart. |
| * Epoch is incremented each time RM restart. It's used for assuring |
| * uniqueness of <code>ContainerId</code>. |
| */ |
| @Private |
| @Unstable |
| public abstract class Epoch { |
| |
| public static Epoch newInstance(long sequenceNumber) { |
| Epoch epoch = Records.newRecord(Epoch.class); |
| epoch.setEpoch(sequenceNumber); |
| return epoch; |
| } |
| |
| public abstract long getEpoch(); |
| |
| public abstract void setEpoch(long sequenceNumber); |
| |
| public abstract EpochProto getProto(); |
| |
| public String toString() { |
| return String.valueOf(getEpoch()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return (int) (getEpoch() ^ (getEpoch() >>> 32)); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| Epoch other = (Epoch) obj; |
| if (this.getEpoch() == other.getEpoch()) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |