kafka DelayedDeleteTopics 源码
kafka DelayedDeleteTopics 代码
文件路径：/core/src/main/scala/kafka/server/DelayedDeleteTopics.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 org.apache.kafka.common.protocol.Errors
import scala.collection._
/**
* The delete metadata maintained by the delayed delete operation
*/
case class DeleteTopicMetadata(topic: String, error: Errors)
object DeleteTopicMetadata {
def apply(topic: String, throwable: Throwable): DeleteTopicMetadata = {
DeleteTopicMetadata(topic, Errors.forException(throwable))
}
}
/**
* A delayed delete topics operation that can be created by the admin manager and watched
* in the topic purgatory
*/
class DelayedDeleteTopics(delayMs: Long,
deleteMetadata: Seq[DeleteTopicMetadata],
adminManager: ZkAdminManager,
responseCallback: Map[String, Errors] => Unit)
extends DelayedOperation(delayMs) {
/**
* The operation can be completed if all of the topics not in error have been removed
*/
override def tryComplete() : Boolean = {
trace(s"Trying to complete operation for $deleteMetadata")
// Ignore topics that already have errors
val existingTopics = deleteMetadata.count { metadata => metadata.error == Errors.NONE && topicExists(metadata.topic) }
if (existingTopics == 0) {
trace("All topics have been deleted or have errors, completing the delayed operation")
forceComplete()
} else {
trace(s"$existingTopics topics still exist, not completing the delayed operation")
false
}
}
/**
* Check for partitions that still exist, update their error code and call the responseCallback
*/
override def onComplete(): Unit = {
trace(s"Completing operation for $deleteMetadata")
val results = deleteMetadata.map { metadata =>
// ignore topics that already have errors
if (metadata.error == Errors.NONE && topicExists(metadata.topic))
(metadata.topic, Errors.REQUEST_TIMED_OUT)
else
(metadata.topic, metadata.error)
}.toMap
responseCallback(results)
}
override def onExpiration(): Unit = { }
private def topicExists(topic: String): Boolean = {
adminManager.metadataCache.contains(topic)
}
}
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