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}