/*
* Copyright 2015 Ben Manes. All Rights Reserved.
*
* 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 com.github.benmanes.caffeine.cache.buffer;
import java.util.function.Consumer;
import org.jctools.queues.MpscCompoundQueue;
import com.github.benmanes.caffeine.cache.ReadBuffer;
/**
* @author ben.manes@gmail.com (Ben Manes)
*/
final class MpscCompoundBuffer<E> extends ReadBuffer<E> {
final MpscCompoundQueue<E> queue;
long drained;
MpscCompoundBuffer() {
queue = new MpscCompoundQueue<>(BUFFER_SIZE);
}
@Override
public int offer(E e) {
return queue.offer(e) ? SUCCESS : FULL;
}
@Override
public void drainTo(Consumer<E> consumer) {
E e = null;
while ((e = queue.poll()) != null) {
consumer.accept(e);
drained++;
}
}
@Override
public int reads() {
return (int) drained;
}
@Override
public int writes() {
return drained() + queue.size();
}
}