DefaultEventBusRegistryProvider.java

/*
 * Copyright (C) 2013 Sebastian Sdorra
 *
 * 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.github.legman;

import com.google.common.collect.Maps;
import java.util.concurrent.ConcurrentMap;

/**
 *
 * @author Sebastian Sdorra
 * @since 1.1.0
 */
public class DefaultEventBusRegistryProvider implements EventBusRegistryProvider
{

  private final ConcurrentMap<String,EventBus> registry = Maps.newConcurrentMap();
  
  @Override
  public EventBus getEventBus(String name)
  {
    EventBus eventBus = registry.get(name);
    if ( eventBus == null ){
        eventBus = new EventBus(name);
        registry.putIfAbsent(name, eventBus);
    }
    return eventBus;
  }
  
}