kafka BlockingMessageQueue 源码
kafka BlockingMessageQueue 代码
文件路径:/raft/src/main/java/org/apache/kafka/raft/internals/BlockingMessageQueue.java
/*
* 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.kafka.raft.internals;
import org.apache.kafka.common.errors.InterruptException;
import org.apache.kafka.common.protocol.ApiMessage;
import org.apache.kafka.raft.RaftMessage;
import org.apache.kafka.raft.RaftMessageQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class BlockingMessageQueue implements RaftMessageQueue {
private static final RaftMessage WAKEUP_MESSAGE = new RaftMessage() {
@Override
public int correlationId() {
return 0;
}
@Override
public ApiMessage data() {
return null;
}
};
private final BlockingQueue<RaftMessage> queue = new LinkedBlockingQueue<>();
private final AtomicInteger size = new AtomicInteger(0);
@Override
public RaftMessage poll(long timeoutMs) {
try {
RaftMessage message = queue.poll(timeoutMs, TimeUnit.MILLISECONDS);
if (message == null || message == WAKEUP_MESSAGE) {
return null;
} else {
size.decrementAndGet();
return message;
}
} catch (InterruptedException e) {
throw new InterruptException(e);
}
}
@Override
public void add(RaftMessage message) {
queue.add(message);
size.incrementAndGet();
}
@Override
public boolean isEmpty() {
return size.get() == 0;
}
@Override
public void wakeup() {
queue.add(WAKEUP_MESSAGE);
}
}
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