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/* =========================================================================================
* Copyright © 2013-2017 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
import com.typesafe.config.{Config, ConfigFactory}
import io.opentracing.propagation.Format
import io.opentracing.{ActiveSpan, Span, SpanContext}
import kamon.metric._
import kamon.trace.Tracer
import kamon.util.{Filters, MeasurementUnit, Registration}
import scala.concurrent.Future
import java.time.Duration
import java.util.concurrent.{Executors, ScheduledExecutorService, ScheduledThreadPoolExecutor}
import io.opentracing.ActiveSpan.Continuation
import org.slf4j.LoggerFactory
import scala.util.Try
object Kamon extends MetricLookup with ReporterRegistry with io.opentracing.Tracer {
private val logger = LoggerFactory.getLogger("kamon.Kamon")
@volatile private var _config = ConfigFactory.load()
@volatile private var _environment = Environment.fromConfig(_config)
@volatile private var _filters = Filters.fromConfig(_config)
private val _scheduler = Executors.newScheduledThreadPool(schedulerPoolSize(_config), numberedThreadFactory("kamon-scheduler"))
private val _metrics = new MetricRegistry(_config, _scheduler)
private val _reporters = new ReporterRegistryImpl(_metrics, _config)
private val _tracer = new Tracer(Kamon, _reporters, _config)
private var _onReconfigureHooks = Seq.empty[OnReconfigureHook]
def environment: Environment =
_environment
def config(): Config =
_config
def reconfigure(config: Config): Unit = synchronized {
_config = config
_environment = Environment.fromConfig(config)
_filters = Filters.fromConfig(config)
_metrics.reconfigure(config)
_reporters.reconfigure(config)
_onReconfigureHooks.foreach(hook => {
Try(hook.onReconfigure(config)).failed.foreach(error =>
logger.error("Exception occurred while trying to run a OnReconfigureHook", error)
)
})
_scheduler match {
case stpe: ScheduledThreadPoolExecutor => stpe.setCorePoolSize(schedulerPoolSize(config))
case other => logger.error("Unexpected scheduler [{}] found when reconfiguring Kamon.", other)
}
}
override def histogram(name: String, unit: MeasurementUnit, dynamicRange: Option[DynamicRange]): HistogramMetric =
_metrics.histogram(name, unit, dynamicRange)
override def counter(name: String, unit: MeasurementUnit): CounterMetric =
_metrics.counter(name, unit)
override def gauge(name: String, unit: MeasurementUnit): GaugeMetric =
_metrics.gauge(name, unit)
override def minMaxCounter(name: String, unit: MeasurementUnit, sampleInterval: Option[Duration],
dynamicRange: Option[DynamicRange]): MinMaxCounterMetric =
_metrics.minMaxCounter(name, unit, dynamicRange, sampleInterval)
override def timer(name: String, dynamicRange: Option[DynamicRange]): TimerMetric =
_metrics.timer(name, dynamicRange)
def tracer: Tracer =
_tracer
override def buildSpan(operationName: String): io.opentracing.Tracer.SpanBuilder =
_tracer.buildSpan(operationName)
override def extract[C](format: Format[C], carrier: C): SpanContext =
_tracer.extract(format, carrier)
override def inject[C](spanContext: SpanContext, format: Format[C], carrier: C): Unit =
_tracer.inject(spanContext, format, carrier)
override def activeSpan(): ActiveSpan =
_tracer.activeSpan()
override def makeActive(span: Span): ActiveSpan =
_tracer.makeActive(span)
/**
* Makes the provided Span active before code is evaluated and deactivates it afterwards.
*/
def withSpan[T](span: Span)(code: => T): T = {
val activeSpan = makeActive(span)
val evaluatedCode = code
activeSpan.deactivate()
evaluatedCode
}
/**
* Actives the provided Continuation before code is evaluated and deactivates it afterwards.
*/
def withContinuation[T](continuation: Continuation)(code: => T): T = {
if(continuation == null)
code
else {
val activeSpan = continuation.activate()
val evaluatedCode = code
activeSpan.deactivate()
evaluatedCode
}
}
/**
* Captures a continuation from the currently active Span (if any).
*/
def activeSpanContinuation(): Continuation = {
val activeSpan = Kamon.activeSpan()
if(activeSpan == null)
null
else
activeSpan.capture()
}
/**
* Runs the provided closure with the currently active Span (if any).
*/
def onActiveSpan[T](code: ActiveSpan => T): Unit = {
val activeSpan = Kamon.activeSpan()
if(activeSpan != null)
code(activeSpan)
}
/**
* Evaluates the provided closure with the currently active Span (if any) and returns the evaluation result. If there
* was no active Span then the provided fallback value
*/
def fromActiveSpan[T](code: ActiveSpan => T): Option[T] =
Option(activeSpan()).map(code)
override def loadReportersFromConfig(): Unit =
_reporters.loadReportersFromConfig()
override def addReporter(reporter: MetricReporter): Registration =
_reporters.addReporter(reporter)
override def addReporter(reporter: MetricReporter, name: String): Registration =
_reporters.addReporter(reporter, name)
override def addReporter(reporter: SpanReporter): Registration =
_reporters.addReporter(reporter)
override def addReporter(reporter: SpanReporter, name: String): Registration =
_reporters.addReporter(reporter, name)
override def stopAllReporters(): Future[Unit] =
_reporters.stopAllReporters()
def filter(filterName: String, pattern: String): Boolean =
_filters.accept(filterName, pattern)
/**
* Register a reconfigure hook that will be run when the a call to Kamon.reconfigure(config) is performed. All
* registered hooks will run sequentially in the same Thread that calls Kamon.reconfigure(config).
*/
def onReconfigure(hook: OnReconfigureHook): Unit = synchronized {
_onReconfigureHooks = hook +: _onReconfigureHooks
}
def scheduler(): ScheduledExecutorService =
_scheduler
private def schedulerPoolSize(config: Config): Int =
config.getInt("kamon.scheduler-pool-size")
}
trait OnReconfigureHook {
def onReconfigure(newConfig: Config): Unit
}
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