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.wake.remote.address;
020
021import org.apache.reef.tang.Tang;
022import org.apache.reef.tang.exceptions.InjectionException;
023
024import java.util.logging.Level;
025import java.util.logging.Logger;
026
027/**
028 * Uses Tang to create the default LocalAddressProvider.
029 *
030 * @deprecated Have an instance of LocalAddressProvider injected instead.
031 */
032@Deprecated
033public final class LocalAddressProviderFactory {
034  private static final Logger LOGGER = Logger.getLogger(LocalAddressProviderFactory.class.getName());
035  private static LocalAddressProvider instance = null;
036
037  /**
038   * This class shall never be instantiated.
039   */
040  private LocalAddressProviderFactory() {
041    // Intentionally left blank.
042  }
043
044  /**
045   * @return the default LocalAddressProvider
046   * @deprecated Have an instance of LocalAddressProvider injected instead.
047   */
048  public static LocalAddressProvider getInstance() {
049    if (null == instance) {
050      makeInstance();
051    }
052    return instance;
053  }
054
055  /**
056   * Makes the instance.
057   */
058  private static void makeInstance() {
059    assert (null == instance);
060    try {
061      LOGGER.log(Level.FINER, "Instantiating default LocalAddressProvider for legacy users.");
062      instance = Tang.Factory.getTang().newInjector().getInstance(LocalAddressProvider.class);
063      LOGGER.log(Level.FINER, "Instantiated default LocalAddressProvider for legacy users.");
064    } catch (final InjectionException e) {
065      throw new RuntimeException("Unable to instantiate default LocalAddressProvider for legacy users.", e);
066    }
067    assert (null != instance);
068  }
069}