/*
* 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 org.jctools.queues.alt;
/**
* A minimal top level queue interface which allows producer/consumers access via separate interfaces.
*
* @author nitsanw
*
* @param <E> element type
*/
public interface ConcurrentQueue<E> {
/**
* @return a consumer instance to be used from a consuming thread.
*/
ConcurrentQueueConsumer<E> consumer();
/**
* @return a producer instance to be used from a producing thread.
*/
ConcurrentQueueProducer<E> producer();
/**
* This method may be O(n) or O(1) and may not be accurate.
*
* @return the number of elements in the queue
*/
int size();
/**
* @return the maximum number of elements that can fit in this queue, or -1 if unbounded.
*/
int capacity();
}