/*
 * Copyright 2017-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.cloud.stream.binder;

import org.springframework.messaging.SubscribableChannel;

/**
 * A channel that can ensure a {@code LastSubscriberMessageHandler} is always the last
 * subscriber.
 *
 * @author Gary Russell
 * @since 1.3
 *
 */
interface LastSubscriberAwareChannel extends SubscribableChannel {

	/**
	 * Return the current subscribers.
	 * @return the subscribers.
	 */
	int subscribers();

}
