src/main/java/com/googlesource/gerrit/plugins/rabbitmq/message/DefaultChangeListener.java

// Copyright (C) 2015 The Android Open Source Project
//
// Licensed 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 com.googlesource.gerrit.plugins.rabbitmq.message;

import com.google.gerrit.common.ChangeListener;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.server.events.ChangeEvent;
import com.google.inject.Singleton;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

@Singleton
public class DefaultChangeListener implements ChangeListener, LifecycleListener {

  private static final Logger LOGGER = LoggerFactory.getLogger(DefaultChangeListener.class);

  private final Set<Publisher> publishers = new CopyOnWriteArraySet<>();

  public void addPublisher(Publisher publisher) {
    publishers.add(publisher);
  }

  public void removePublisher(Publisher publisher) {
    publishers.remove(publisher);
  }

  public void clear() {
    publishers.clear();
  }

  @Override
  public void start() {
    LOGGER.info("Start default listener.");
    for (Publisher publisher : publishers) {
      publisher.start();
    }
  }

  @Override
  public void stop() {
    LOGGER.info("Stop default listener.");
    for (Publisher publisher : publishers) {
      publisher.stop();
    }
  }

  @Override
  public void onChangeEvent(ChangeEvent event) {
    for (Publisher publisher : publishers) {
      publisher.onChangeEvent(event);
    }
  }
}