BlockingBackChannelBroker.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.flink.runtime.iterative.concurrent;

/**
 * Singleton class for the threadsafe handover of {@link BlockingBackChannel}s from iteration heads to iteration tails
 */
public class BlockingBackChannelBroker extends Broker<BlockingBackChannel> {

	/**
	 * Singleton instance
	 */
	private static final BlockingBackChannelBroker INSTANCE = new BlockingBackChannelBroker();

	private BlockingBackChannelBroker() {}

	/**
	 * retrieve singleton instance
	 */
	public static Broker<BlockingBackChannel> instance() {
		return INSTANCE;
	}
}