kafka ActionQueue 源码
kafka ActionQueue 代码
文件路径：/core/src/main/scala/kafka/server/ActionQueue.scala
/**
* 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 kafka.server
import java.util.concurrent.ConcurrentLinkedQueue
import kafka.utils.Logging
/**
* This queue is used to collect actions which need to be executed later. One use case is that ReplicaManager#appendRecords
* produces record changes so we need to check and complete delayed requests. In order to avoid conflicting locking,
* we add those actions to this queue and then complete them at the end of KafkaApis.handle() or DelayedJoin.onExpiration.
*/
class ActionQueue extends Logging {
private val queue = new ConcurrentLinkedQueue[() => Unit]()
/**
* add action to this queue.
* @param action action
*/
def add(action: () => Unit): Unit = queue.add(action)
/**
* try to complete all delayed actions
*/
def tryCompleteActions(): Unit = {
val maxToComplete = queue.size()
var count = 0
var done = false
while (!done && count < maxToComplete) {
try {
val action = queue.poll()
if (action == null) done = true
else action()
} catch {
case e: Throwable =>
error("failed to complete delayed actions", e)
} finally count += 1
}
}
}
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