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/*
* =========================================================================================
* Copyright © 2013-2015 the kamon project <http://kamon.io/>
*
* Licensed 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 kamon.system.jmx
import java.lang.management.{ ManagementFactory, MemoryPoolMXBean }
import kamon.metric.GenericEntityRecorder
import kamon.metric.instrument.{ InstrumentFactory, Memory }
import scala.collection.convert.WrapAsScala
/**
* Generic memory pool stat recorder.
* Records the amount of used, max, and committed memory in bytes for each passed MemoryPoolMXBean.
* @param instrumentFactory Helpers for metric recording.
* @param beansWithNames Data sources with metric name prefixes.
*/
class MemoryPoolMetrics(instrumentFactory: InstrumentFactory,
beansWithNames: Iterable[MemoryBeanWithMetricName]) extends GenericEntityRecorder(instrumentFactory) {
beansWithNames.foreach {
case MemoryBeanWithMetricName(name, bean) ⇒
gauge(name + "-used", Memory.Bytes, () ⇒ {
bean.getUsage.getUsed
})
gauge(name + "-max", Memory.Bytes, () ⇒ {
val max = bean.getUsage.getMax
// .getMax can return -1 if the max is not defined.
if (max >= 0) max
else 0
})
gauge(name + "-committed", Memory.Bytes, () ⇒ {
bean.getUsage.getCommitted
})
}
}
/**
* Objects of this kind may be passed to [[MemoryPoolMetrics]] for data collection.
* @param metricName The sanitized name of a [[MemoryPoolMXBean]].
* @param bean The data source for metrics.
*/
private[jmx] final case class MemoryBeanWithMetricName(metricName: String, bean: MemoryPoolMXBean)
/**
* Memory Pool metrics, as reported by JMX:
* - @see [[http://docs.oracle.com/javase/7/docs/api/java/lang/management/MemoryMXBean.html "MemoryMXBean"]]
* Pools in HotSpot Java 8:
* code-cache, metaspace, compressed-class-space, ps-eden-space, ps-survivor-space, ps-old-gen
*/
object MemoryPoolMetrics extends JmxSystemMetricRecorderCompanion("memory-pool") with WrapAsScala {
private val invalidChars = """[^a-z0-9]""".r
private def sanitizedName(memoryPoolMXBean: MemoryPoolMXBean) =
invalidChars.replaceAllIn(memoryPoolMXBean.getName.toLowerCase, "-")
private val beansWithNames = ManagementFactory.getMemoryPoolMXBeans.toIterable.map { bean ⇒
MemoryBeanWithMetricName(sanitizedName(bean), bean)
}
def apply(instrumentFactory: InstrumentFactory): MemoryPoolMetrics =
new MemoryPoolMetrics(instrumentFactory, beansWithNames)
}
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