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.common.evaluator.context.defaults;
020
021import org.apache.reef.annotations.Provided;
022import org.apache.reef.annotations.audience.EvaluatorSide;
023import org.apache.reef.evaluator.context.ContextMessage;
024import org.apache.reef.evaluator.context.ContextMessageSource;
025import org.apache.reef.util.Optional;
026
027import javax.inject.Inject;
028
029/**
030 * Default ContextMessageSource: return nothing.
031 */
032@EvaluatorSide
033@Provided
034public final class DefaultContextMessageSource implements ContextMessageSource {
035
036  @Inject
037  public DefaultContextMessageSource() {
038  }
039
040  @Override
041  public Optional<ContextMessage> getMessage() {
042    return Optional.empty();
043  }
044}