/*
* 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.channels;
/**
* A minimal top level queue interface which allows producer/consumers access via separate interfaces.
*
* Channels may determine their capacity themselves with additional slack or resize themselves as powers of two etc.
* Consequently instead of having a definite concept of a "capacity" channels have a requested capacity and a maximum
* capacity. The requested capacity is the capacity requested when you create the channel and the maximum capacity is the
* size that the channel has resized itself up to.
*
* @param <E> element type
*/
public interface Channel<E> {
/**
* @param callback the accept function for this consumer
* @return a consumer instance to be used for this particular thread.
*/
ChannelConsumer consumer(ChannelReceiver<E> callback);
/**
* @return a producer instance to be used for this particular thread.
*/
ChannelProducer<E> producer();
/**
* Get the number of elements in the queue.
*
* @return the number of elements in the queue.
*/
int size();
/**
* @return the maximum number of elements that can fit in this channel.
*/
int maximumCapacity();
/**
* @return The requested maximum number of elements that can fit in this channel.
*/
int requestedCapacity();
boolean isEmpty();
}