kafka Server 源码
kafka Server 代码
文件路径：/core/src/main/scala/kafka/server/Server.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.clients.CommonClientConfigs
import org.apache.kafka.common.metrics.{KafkaMetricsContext, MetricConfig, Metrics, MetricsReporter, Sensor}
import org.apache.kafka.common.utils.Time
import java.util
import java.util.concurrent.TimeUnit
trait Server {
def startup(): Unit
def shutdown(): Unit
def awaitShutdown(): Unit
}
object Server {
val MetricsPrefix: String = "kafka.server"
val ClusterIdLabel: String = "kafka.cluster.id"
val BrokerIdLabel: String = "kafka.broker.id"
val NodeIdLabel: String = "kafka.node.id"
def initializeMetrics(
config: KafkaConfig,
time: Time,
clusterId: String
): Metrics = {
val metricsContext = createKafkaMetricsContext(config, clusterId)
buildMetrics(config, time, metricsContext)
}
private def buildMetrics(
config: KafkaConfig,
time: Time,
metricsContext: KafkaMetricsContext
): Metrics = {
val metricConfig = buildMetricsConfig(config)
new Metrics(metricConfig, new util.ArrayList[MetricsReporter](), time, true, metricsContext)
}
def buildMetricsConfig(
kafkaConfig: KafkaConfig
): MetricConfig = {
new MetricConfig()
.samples(kafkaConfig.metricNumSamples)
.recordLevel(Sensor.RecordingLevel.forName(kafkaConfig.metricRecordingLevel))
.timeWindow(kafkaConfig.metricSampleWindowMs, TimeUnit.MILLISECONDS)
}
private[server] def createKafkaMetricsContext(
config: KafkaConfig,
clusterId: String
): KafkaMetricsContext = {
val contextLabels = new java.util.HashMap[String, Object]
contextLabels.put(ClusterIdLabel, clusterId)
if (config.usesSelfManagedQuorum) {
contextLabels.put(NodeIdLabel, config.nodeId.toString)
} else {
contextLabels.put(BrokerIdLabel, config.brokerId.toString)
}
contextLabels.putAll(config.originalsWithPrefix(CommonClientConfigs.METRICS_CONTEXT_PREFIX))
new KafkaMetricsContext(MetricsPrefix, contextLabels)
}
sealed trait ProcessStatus
case object SHUTDOWN extends ProcessStatus
case object STARTING extends ProcessStatus
case object STARTED extends ProcessStatus
case object SHUTTING_DOWN extends ProcessStatus
}
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