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/**
* 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.metrics
import java.util.concurrent.TimeUnit
import com.yammer.metrics.Metrics
import com.yammer.metrics.core.{Gauge, MetricName}
import kafka.utils.Logging
import org.apache.kafka.common.utils.Sanitizer
trait KafkaMetricsGroup extends Logging {
/**
* Creates a new MetricName object for gauges, meters, etc. created for this
* metrics group.
* @param name Descriptive name of the metric.
* @param tags Additional attributes which mBean will have.
* @return Sanitized metric name object.
*/
def metricName(name: String, tags: scala.collection.Map[String, String]): MetricName = {
val klass = this.getClass
val pkg = if (klass.getPackage == null) "" else klass.getPackage.getName
val simpleName = klass.getSimpleName.replaceAll("\\$$", "")
explicitMetricName(pkg, simpleName, name, tags)
}
protected def explicitMetricName(group: String, typeName: String, name: String,
tags: scala.collection.Map[String, String]): MetricName = {
val nameBuilder: StringBuilder = new StringBuilder
nameBuilder.append(group)
nameBuilder.append(":type=")
nameBuilder.append(typeName)
if (name.length > 0) {
nameBuilder.append(",name=")
nameBuilder.append(name)
}
val scope: String = toScope(tags).getOrElse(null)
val tagsName = toMBeanName(tags)
tagsName.foreach(nameBuilder.append(",").append(_))
new MetricName(group, typeName, name, scope, nameBuilder.toString)
}
def newGauge[T](name: String, metric: Gauge[T], tags: scala.collection.Map[String, String] = Map.empty) =
Metrics.defaultRegistry().newGauge(metricName(name, tags), metric)
def newMeter(name: String, eventType: String, timeUnit: TimeUnit, tags: scala.collection.Map[String, String] = Map.empty) =
Metrics.defaultRegistry().newMeter(metricName(name, tags), eventType, timeUnit)
def newHistogram(name: String, biased: Boolean = true, tags: scala.collection.Map[String, String] = Map.empty) =
Metrics.defaultRegistry().newHistogram(metricName(name, tags), biased)
def newTimer(name: String, durationUnit: TimeUnit, rateUnit: TimeUnit, tags: scala.collection.Map[String, String] = Map.empty) =
Metrics.defaultRegistry().newTimer(metricName(name, tags), durationUnit, rateUnit)
def removeMetric(name: String, tags: scala.collection.Map[String, String] = Map.empty) =
Metrics.defaultRegistry().removeMetric(metricName(name, tags))
private def toMBeanName(tags: collection.Map[String, String]): Option[String] = {
val filteredTags = tags.filter { case (_, tagValue) => tagValue != "" }
if (filteredTags.nonEmpty) {
val tagsString = filteredTags.map { case (key, value) => "%s=%s".format(key, Sanitizer.jmxSanitize(value)) }.mkString(",")
Some(tagsString)
}
else None
}
private def toScope(tags: collection.Map[String, String]): Option[String] = {
val filteredTags = tags.filter { case (_, tagValue) => tagValue != ""}
if (filteredTags.nonEmpty) {
// convert dot to _ since reporters like Graphite typically use dot to represent hierarchy
val tagsString = filteredTags
.toList.sortWith((t1, t2) => t1._1 < t2._1)
.map { case (key, value) => "%s.%s".format(key, value.replaceAll("\\.", "_"))}
.mkString(".")
Some(tagsString)
}
else None
}
}
object KafkaMetricsGroup extends KafkaMetricsGroup
