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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.sigar
import akka.event.LoggingAdapter
import kamon.metric.GenericEntityRecorder
import kamon.metric.instrument.{ Memory, InstrumentFactory }
import org.hyperic.sigar.{ DiskUsage, FileSystem, Sigar }
import scala.util.Try
/**
* Disk usage metrics, as reported by Sigar:
* - readBytes: Total number of physical disk reads.
* - writesBytes: Total number of physical disk writes.
*/
class FileSystemMetrics(sigar: Sigar, instrumentFactory: InstrumentFactory, logger: LoggingAdapter) extends GenericEntityRecorder(instrumentFactory) with SigarMetric {
import kamon.system.sigar.SigarSafeRunner._
val reads = DiffRecordingHistogram(histogram("file-system-reads", Memory.Bytes))
val writes = DiffRecordingHistogram(histogram("file-system-writes", Memory.Bytes))
val fileSystems = runSafe(sigar.getFileSystemList.filter(_.getType == FileSystem.TYPE_LOCAL_DISK).map(_.getDevName).toSet, Set.empty[String], "file-system", logger)
def sumOfAllFileSystems(sigar: Sigar, thunk: DiskUsage ⇒ Long): Long = Try {
fileSystems.map(i ⇒ thunk(sigar.getDiskUsage(i))).fold(0L)(_ + _)
} getOrElse 0L
def update(): Unit = {
reads.record(sumOfAllFileSystems(sigar, _.getReadBytes))
writes.record(sumOfAllFileSystems(sigar, _.getWriteBytes))
}
}
object FileSystemMetrics extends SigarMetricRecorderCompanion("file-system") {
def apply(sigar: Sigar, instrumentFactory: InstrumentFactory, logger: LoggingAdapter): FileSystemMetrics =
new FileSystemMetrics(sigar, instrumentFactory, logger)
}
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