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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 java.time.Duration
import java.util.concurrent.{Executors, ScheduledExecutorService, ScheduledThreadPoolExecutor}
import com.typesafe.config.{Config, ConfigFactory}
import kamon.context.{Codecs, Context, Key, Storage}
import kamon.metric._
import kamon.trace._
import kamon.util.{Clock, Filters, Matcher, Registration}
import org.slf4j.LoggerFactory
import scala.concurrent.Future
import scala.util.Try
object Kamon extends MetricLookup with ReporterRegistry with 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 _clock = new Clock.Default()
private val _scheduler = Executors.newScheduledThreadPool(schedulerPoolSize(_config), numberedThreadFactory("kamon-scheduler"))
private val _metrics = new MetricRegistry(_config, _scheduler)
private val _reporterRegistry = new ReporterRegistry.Default(_metrics, _config, _clock)
private val _tracer = Tracer.Default(Kamon, _reporterRegistry, _config, _clock)
private val _contextStorage = Storage.ThreadLocal()
private val _contextCodec = new Codecs(_config)
private var _onReconfigureHooks = Seq.empty[OnReconfigureHook]
sys.addShutdownHook(() => _scheduler.shutdown())
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)
_reporterRegistry.reconfigure(config)
_tracer.reconfigure(config)
_contextCodec.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 rangeSampler(name: String, unit: MeasurementUnit, sampleInterval: Option[Duration],
dynamicRange: Option[DynamicRange]): RangeSamplerMetric =
_metrics.rangeSampler(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): Tracer.SpanBuilder =
_tracer.buildSpan(operationName)
override def identityProvider: IdentityProvider =
_tracer.identityProvider
def contextCodec(): Codecs =
_contextCodec
def currentContext(): Context =
_contextStorage.current()
def currentSpan(): Span =
_contextStorage.current().get(Span.ContextKey)
def storeContext(context: Context): Storage.Scope =
_contextStorage.store(context)
def withContext[T](context: Context)(f: => T): T = {
val scope = _contextStorage.store(context)
try {
f
} finally {
scope.close()
}
}
def withContextKey[T, K](key: Key[K], value: K)(f: => T): T =
withContext(currentContext().withKey(key, value))(f)
def withSpan[T](span: Span)(f: => T): T =
withSpan(span, true)(f)
def withSpan[T](span: Span, finishSpan: Boolean)(f: => T): T = {
try {
withContextKey(Span.ContextKey, span)(f)
} catch {
case t: Throwable =>
span.addError(t.getMessage, t)
throw t
} finally {
if(finishSpan)
span.finish()
}
}
override def loadReportersFromConfig(): Unit =
_reporterRegistry.loadReportersFromConfig()
override def addReporter(reporter: MetricReporter): Registration =
_reporterRegistry.addReporter(reporter)
override def addReporter(reporter: MetricReporter, name: String): Registration =
_reporterRegistry.addReporter(reporter, name)
override def addReporter(reporter: MetricReporter, name: String, filter: String): Registration =
_reporterRegistry.addReporter(reporter, name, filter)
override def addReporter(reporter: SpanReporter): Registration =
_reporterRegistry.addReporter(reporter)
override def addReporter(reporter: SpanReporter, name: String): Registration =
_reporterRegistry.addReporter(reporter, name)
override def stopAllReporters(): Future[Unit] =
_reporterRegistry.stopAllReporters()
def filter(filterName: String, pattern: String): Boolean =
_filters.accept(filterName, pattern)
def filter(filterName: String): Matcher =
_filters.get(filterName)
def clock(): Clock =
_clock
/**
* 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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