helix-core/src/main/java/org/apache/helix/controller/stages/MessageOutput.java

package org.apache.helix.controller.stages;

/*
 * 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.
 */

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.helix.model.Message;
import org.apache.helix.model.Partition;

public class MessageOutput {
  private final Map<String, Map<Partition, List<Message>>> _messagesMap;
  private final List<Message> _statusChangeMessages;

  public MessageOutput() {
    _messagesMap = new HashMap<>();
    _statusChangeMessages = new ArrayList<>();
  }

  public void addMessage(String resourceName, Partition partition, Message message) {
    if (!_messagesMap.containsKey(resourceName)) {
      _messagesMap.put(resourceName, new HashMap<Partition, List<Message>>());
    }
    if (!_messagesMap.get(resourceName).containsKey(partition)) {
      _messagesMap.get(resourceName).put(partition, new ArrayList<Message>());

    }
    _messagesMap.get(resourceName).get(partition).add(message);

  }

  public void addMessages(String resourceName, Partition partition,
      List<Message> messages) {
    if (!_messagesMap.containsKey(resourceName)) {
      _messagesMap.put(resourceName, new HashMap<Partition, List<Message>>());
    }
    _messagesMap.get(resourceName).put(partition, messages);
  }

  public void addStatusChangeMessages(List<Message> messages) {
    _statusChangeMessages.addAll(messages);
  }

  public List<Message> getMessages(String resourceName, Partition resource) {
    Map<Partition, List<Message>> map = _messagesMap.get(resourceName);
    if (map != null && map.get(resource) != null) {
      return map.get(resource);
    }
    return Collections.emptyList();
  }

  public Map<Partition, List<Message>> getResourceMessageMap(String resourceName) {
    return _messagesMap.getOrDefault(resourceName, Collections.emptyMap());
  }

  public List<Message> getStatusChangeMessages() {
    return _statusChangeMessages;
  }

  @Override
  public String toString() {
    return _messagesMap.toString();
  }
}