/*
* Copyright 1999-2015 dangdang.com.
* <p>
* 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.
* </p>
*/
package com.dangdang.ddframe.rdb.sharding.executor.event;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import java.util.concurrent.ConcurrentHashMap;
/**
* 事件总线工厂.
*
* @author gaohongtao
*/
@NoArgsConstructor(access = AccessLevel.PRIVATE)
final class ExecutionEventBusFactory {
private static final ConcurrentHashMap<String, ExecutionEventBus> CONTAINER = new ConcurrentHashMap<>();
/**
* 获取事件总线实例.
*
* @param name 事件总线名称
* @return 事件总线实例
*/
public static ExecutionEventBus getInstance(final String name) {
if (CONTAINER.containsKey(name)) {
return CONTAINER.get(name);
}
CONTAINER.putIfAbsent(name, new ExecutionEventBus());
return CONTAINER.get(name);
}
}