runtime/common/src/main/java/org/apache/nemo/runtime/common/message/local/LocalMessageContext.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.nemo.runtime.common.message.local;

import org.apache.nemo.runtime.common.message.MessageContext;

import java.util.Optional;

/**
 * A simple {@link MessageContext} implementation that works on a single node.
 */
final class LocalMessageContext implements MessageContext {

  private final String senderId;
  private Object replyMessage;

  /**
   * TODO #10: Handle Method Javadocs Requirements for Checkstyle Warnings.
   *
   * @param senderId TODO #10: Handle Method Javadocs Requirements for Checkstyle Warnings.
   */
  LocalMessageContext(final String senderId) {
    this.senderId = senderId;
  }

  public String getSenderId() {
    return senderId;
  }

  @Override
  public <T> void reply(final T message) {
    this.replyMessage = message;
  }

  /**
   * TODO #10: Handle Method Javadocs Requirements for Checkstyle Warnings.
   *
   * @return TODO #10: Handle Method Javadocs Requirements for Checkstyle Warnings.
   */
  public Optional<Object> getReplyMessage() {
    return Optional.ofNullable(replyMessage);
  }
}