| /* |
| * 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.statefun.flink.core.feedback; |
| |
| import java.util.Deque; |
| import org.apache.flink.statefun.flink.core.queue.Locks; |
| import org.apache.flink.statefun.flink.core.queue.MpscQueue; |
| |
| public final class LockFreeBatchFeedbackQueue<ElementT> implements FeedbackQueue<ElementT> { |
| private static final int INITIAL_BUFFER_SIZE = 32 * 1024; // 32k |
| |
| private final MpscQueue<ElementT> queue = new MpscQueue<>(INITIAL_BUFFER_SIZE, Locks.spinLock()); |
| |
| @Override |
| public boolean addAndCheckIfWasEmpty(ElementT element) { |
| final int size = queue.add(element); |
| return size == 1; |
| } |
| |
| @Override |
| public Deque<ElementT> drainAll() { |
| return queue.drainAll(); |
| } |
| } |
