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/*
* =========================================================================================
* Copyright © 2013-2014 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.metrics
import akka.actor.ActorSystem
import com.typesafe.config.Config
import kamon.metric._
import kamon.metric.instrument.Gauge.CurrentValueCollector
import kamon.metric.instrument.{ Gauge, Histogram }
import kamon.system.SigarExtensionProvider
import org.hyperic.sigar.Mem
case class MemoryMetrics(name: String) extends MetricGroupIdentity {
val category = MemoryMetrics
}
object MemoryMetrics extends MetricGroupCategory {
val name = "memory"
case object Used extends MetricIdentity { val name = "used" }
case object Free extends MetricIdentity { val name = "free" }
case object Buffer extends MetricIdentity { val name = "buffer" }
case object Cache extends MetricIdentity { val name = "cache" }
case object SwapUsed extends MetricIdentity { val name = "swap-used" }
case object SwapFree extends MetricIdentity { val name = "swap-free" }
case class MemoryMetricRecorder(used: Gauge, free: Gauge, buffer: Gauge, cache: Gauge, swapUsed: Gauge, swapFree: Gauge)
extends MetricGroupRecorder {
def collect(context: CollectionContext): MetricGroupSnapshot = {
MemoryMetricSnapshot(used.collect(context), free.collect(context), buffer.collect(context), cache.collect(context), swapUsed.collect(context), swapFree.collect(context))
}
def cleanup: Unit = {}
}
case class MemoryMetricSnapshot(used: Histogram.Snapshot, free: Histogram.Snapshot, buffer: Histogram.Snapshot, cache: Histogram.Snapshot, swapUsed: Histogram.Snapshot, swapFree: Histogram.Snapshot)
extends MetricGroupSnapshot {
type GroupSnapshotType = MemoryMetricSnapshot
def merge(that: GroupSnapshotType, context: CollectionContext): GroupSnapshotType = {
MemoryMetricSnapshot(used.merge(that.used, context), free.merge(that.free, context), buffer.merge(that.buffer, context), cache.merge(that.cache, context), swapUsed.merge(that.swapUsed, context), swapFree.merge(that.swapFree, context))
}
lazy val metrics: Map[MetricIdentity, MetricSnapshot] = Map(
Used -> used,
Free -> free,
Buffer -> buffer,
Cache -> cache,
SwapUsed -> swapUsed,
SwapFree -> swapFree)
}
val Factory = new MetricGroupFactory with SigarExtensionProvider {
def mem = sigar.getMem
def swap = sigar.getSwap
type GroupRecorder = MemoryMetricRecorder
def create(config: Config, system: ActorSystem): GroupRecorder = {
val settings = config.getConfig("precision.system.memory")
val usedConfig = settings.getConfig("used")
val freeConfig = settings.getConfig("free")
val bufferConfig = settings.getConfig("buffer")
val cacheConfig = settings.getConfig("cache")
val swapUsedConfig = settings.getConfig("swap-used")
val swapFreeConfig = settings.getConfig("swap-free")
new MemoryMetricRecorder(
Gauge.fromConfig(usedConfig, system)(() ⇒ mem.getUsed),
Gauge.fromConfig(freeConfig, system)(() ⇒ mem.getFree),
Gauge.fromConfig(bufferConfig, system)(() ⇒ swap.getUsed),
Gauge.fromConfig(cacheConfig, system)(() ⇒ swap.getFree),
Gauge.fromConfig(swapUsedConfig, system)(collectBuffer(mem)),
Gauge.fromConfig(swapFreeConfig, system)(collectCache(mem)))
}
private def collectBuffer(mem: Mem) = () ⇒ if (mem.getUsed() != mem.getActualUsed()) mem.getActualUsed() else 0L
private def collectCache(mem: Mem) = () ⇒ if (mem.getFree() != mem.getActualFree()) mem.getActualFree() else 0L
}
}
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