| /** |
| * 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.api.records; |
| |
| import java.text.NumberFormat; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Stable; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| |
| /** |
| * <p><code>ApplicationId</code> represents the <em>globally unique</em> |
| * identifier for an application.</p> |
| * |
| * <p>The globally unique nature of the identifier is achieved by using the |
| * <em>cluster timestamp</em> i.e. start-time of the |
| * <code>ResourceManager</code> along with a monotonically increasing counter |
| * for the application.</p> |
| */ |
| @Public |
| @Stable |
| public abstract class ApplicationId implements Comparable<ApplicationId> { |
| |
| public static final String appIdStrPrefix = "application_"; |
| |
| /** |
| * Get the short integer identifier of the <code>ApplicationId</code> |
| * which is unique for all applications started by a particular instance |
| * of the <code>ResourceManager</code>. |
| * @return short integer identifier of the <code>ApplicationId</code> |
| */ |
| @Public |
| @Stable |
| public abstract int getId(); |
| |
| @Private |
| @Unstable |
| public abstract void setId(int id); |
| |
| /** |
| * Get the <em>start time</em> of the <code>ResourceManager</code> which is |
| * used to generate globally unique <code>ApplicationId</code>. |
| * @return <em>start time</em> of the <code>ResourceManager</code> |
| */ |
| public abstract long getClusterTimestamp(); |
| |
| @Private |
| @Unstable |
| public abstract void setClusterTimestamp(long clusterTimestamp); |
| |
| |
| |
| static final ThreadLocal<NumberFormat> appIdFormat = |
| new ThreadLocal<NumberFormat>() { |
| @Override |
| public NumberFormat initialValue() { |
| NumberFormat fmt = NumberFormat.getInstance(); |
| fmt.setGroupingUsed(false); |
| fmt.setMinimumIntegerDigits(4); |
| return fmt; |
| } |
| }; |
| |
| @Override |
| public int compareTo(ApplicationId other) { |
| if (this.getClusterTimestamp() - other.getClusterTimestamp() == 0) { |
| return this.getId() - other.getId(); |
| } else { |
| return this.getClusterTimestamp() > other.getClusterTimestamp() ? 1 : |
| this.getClusterTimestamp() < other.getClusterTimestamp() ? -1 : 0; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return appIdStrPrefix + this.getClusterTimestamp() + "_" |
| + appIdFormat.get().format(getId()); |
| } |
| |
| @Override |
| public int hashCode() { |
| // Generated by eclipse. |
| final int prime = 31; |
| int result = 1; |
| long clusterTimestamp = getClusterTimestamp(); |
| result = prime * result |
| + (int) (clusterTimestamp ^ (clusterTimestamp >>> 32)); |
| result = prime * result + getId(); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| ApplicationId other = (ApplicationId) obj; |
| if (this.getClusterTimestamp() != other.getClusterTimestamp()) |
| return false; |
| if (this.getId() != other.getId()) |
| return false; |
| return true; |
| } |
| } |