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.io.checkpoint;
020
021import org.apache.commons.lang.RandomStringUtils;
022import org.apache.reef.tang.annotations.Name;
023import org.apache.reef.tang.annotations.NamedParameter;
024import org.apache.reef.tang.annotations.Parameter;
025
026import javax.inject.Inject;
027
028/**
029 * Simple naming service that generates a random checkpoint name.
030 */
031public class RandomNameCNS implements CheckpointNamingService {
032
033  private final String prefix;
034
035  @Inject
036  public RandomNameCNS(@Parameter(PREFIX.class) final String prefix) {
037    this.prefix = prefix;
038  }
039
040  @Override
041  public String getNewName() {
042    return this.prefix + RandomStringUtils.randomAlphanumeric(8);
043  }
044
045  /**
046   * The prefix used for the random names returned.
047   */
048  @NamedParameter(doc = "The prefix used for the random names returned.", default_value = "checkpoint_")
049  public static class PREFIX implements Name<String> {
050  }
051
052}