Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.runtime.local.driver;
020
021
022/**
023 * Generates unique IDs.
024 */
025public final class IDMaker {
026
027  private final String prefix;
028  private int counter = 0;
029
030  /**
031   * The ids generated by getNextID are of the form "prefixNUMBER", where
032   * number is counted up.
033   *
034   * @param prefix a prefix to be used for the IDs generated.
035   */
036  public IDMaker(final String prefix) {
037    this.prefix = prefix;
038  }
039
040  /**
041   * @return the next ID
042   */
043  public String getNextID() {
044    this.counter += 1;
045    return this.prefix + this.counter;
046  }
047}