| /** |
| * 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.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceAudience.Public; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.util.FastNumberFormat; |
| import org.apache.hadoop.yarn.util.Records; |
| |
| /** |
| * <p> |
| * {@link ReservationId} represents the <em>globally unique</em> identifier for |
| * a reservation. |
| * </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} |
| * along with a monotonically increasing counter for the reservation. |
| * </p> |
| */ |
| @Public |
| @Unstable |
| public abstract class ReservationId implements Comparable<ReservationId> { |
| |
| @Private |
| @Unstable |
| public static final String reserveIdStrPrefix = "reservation_"; |
| protected long clusterTimestamp; |
| protected long id; |
| |
| @Private |
| @Unstable |
| public static ReservationId newInstance(long clusterTimestamp, long id) { |
| ReservationId reservationId = Records.newRecord(ReservationId.class); |
| reservationId.setClusterTimestamp(clusterTimestamp); |
| reservationId.setId(id); |
| reservationId.build(); |
| return reservationId; |
| } |
| |
| /** |
| * Get the long identifier of the {@link ReservationId} which is unique for |
| * all Reservations started by a particular instance of the |
| * {@code ResourceManager}. |
| * |
| * @return long identifier of the {@link ReservationId} |
| */ |
| @Public |
| @Unstable |
| public abstract long getId(); |
| |
| @Private |
| @Unstable |
| protected abstract void setId(long id); |
| |
| /** |
| * Get the <em>start time</em> of the {@code ResourceManager} which is used to |
| * generate globally unique {@link ReservationId}. |
| * |
| * @return <em>start time</em> of the {@code ResourceManager} |
| */ |
| @Public |
| @Unstable |
| public abstract long getClusterTimestamp(); |
| |
| @Private |
| @Unstable |
| protected abstract void setClusterTimestamp(long clusterTimestamp); |
| |
| protected abstract void build(); |
| |
| private static final int RESERVATION_ID_MIN_DIGITS = 4; |
| |
| @Override |
| public int compareTo(ReservationId other) { |
| if (this.getClusterTimestamp() - other.getClusterTimestamp() == 0) { |
| return Long.compare(getId(), other.getId()); |
| } else { |
| return Long.compare(getClusterTimestamp(), other.getClusterTimestamp()); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(64); |
| sb.append(reserveIdStrPrefix); |
| sb.append(getClusterTimestamp()); |
| sb.append('_'); |
| FastNumberFormat.format(sb, getId(), RESERVATION_ID_MIN_DIGITS); |
| return sb.toString(); |
| } |
| |
| /** |
| * Parse the string argument as a {@link ReservationId} |
| * |
| * @param reservationId the string representation of the {@link ReservationId} |
| * @return the {@link ReservationId} corresponding to the input string if |
| * valid, null if input is null |
| * @throws IOException if unable to parse the input string |
| */ |
| @Public |
| @Unstable |
| public static ReservationId parseReservationId(String reservationId) |
| throws IOException { |
| if (reservationId == null) { |
| return null; |
| } |
| if (!reservationId.startsWith(reserveIdStrPrefix)) { |
| throw new IOException("The specified reservation id is invalid: " |
| + reservationId); |
| } |
| String[] resFields = reservationId.split("_"); |
| if (resFields.length != 3) { |
| throw new IOException("The specified reservation id is not parseable: " |
| + reservationId); |
| } |
| return newInstance(Long.parseLong(resFields[1]), |
| Long.parseLong(resFields[2])); |
| } |
| |
| @Override |
| public int hashCode() { |
| // generated by eclipse |
| final int prime = 31; |
| int result = 1; |
| result = |
| prime * result |
| + (int) (getClusterTimestamp() ^ (getClusterTimestamp() >>> 32)); |
| result = prime * result + (int) (getId() ^ (getId() >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| // generated by eclipse |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| ReservationId other = (ReservationId) obj; |
| if (getClusterTimestamp() != other.getClusterTimestamp()) |
| return false; |
| if (getId() != other.getId()) |
| return false; |
| return true; |
| } |
| |
| } |