kafka StateChangeLogger 源码
kafka StateChangeLogger 代码
文件路径：/core/src/main/scala/kafka/controller/StateChangeLogger.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.controller
import com.typesafe.scalalogging.Logger
import kafka.utils.Logging
object StateChangeLogger {
private val logger = Logger("state.change.logger")
}
/**
* Simple class that sets `logIdent` appropriately depending on whether the state change logger is being used in the
* context of the KafkaController or not (e.g. ReplicaManager and MetadataCache log to the state change logger
* irrespective of whether the broker is the Controller).
*/
class StateChangeLogger(brokerId: Int, inControllerContext: Boolean, controllerEpoch: Option[Int]) extends Logging {
if (controllerEpoch.isDefined && !inControllerContext)
throw new IllegalArgumentException("Controller epoch should only be defined if inControllerContext is true")
override lazy val logger = StateChangeLogger.logger
locally {
val prefix = if (inControllerContext) "Controller" else "Broker"
val epochEntry = controllerEpoch.fold("")(epoch => s" epoch=$epoch")
logIdent = s"[$prefix id=$brokerId$epochEntry] "
}
def withControllerEpoch(controllerEpoch: Int): StateChangeLogger =
new StateChangeLogger(brokerId, inControllerContext, Some(controllerEpoch))
def messageWithPrefix(message: String): String = msgWithLogIdent(message)
}
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