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package kamon
import java.time.Instant
import java.util.concurrent.atomic.{AtomicLong, AtomicReference}
import java.util.concurrent._
import com.typesafe.config.Config
import com.typesafe.scalalogging.Logger
import kamon.metric._
import kamon.trace.Span
import scala.concurrent.{ExecutionContext, ExecutionContextExecutorService, Future}
import scala.util.Try
import scala.util.control.NonFatal
trait ReporterRegistry {
def loadFromConfig(): Unit
def add(reporter: MetricsReporter): Registration
def add(reporter: MetricsReporter, name: String): Registration
def add(reporter: SpansReporter): Registration
def stopAll(): Future[Unit]
}
trait Registration {
def cancel(): Boolean
}
trait MetricsReporter {
def start(): Unit
def stop(): Unit
def reconfigure(config: Config): Unit
def reportTickSnapshot(snapshot: TickSnapshot): Unit
}
trait SpansReporter {
def start(): Unit
def stop(): Unit
def reconfigure(config: Config): Unit
def reportSpan(span: Span.CompletedSpan): Unit
}
class ReporterRegistryImpl(metrics: MetricsSnapshotGenerator, initialConfig: Config) extends ReporterRegistry {
private val registryExecutionContext = Executors.newSingleThreadScheduledExecutor(threadFactory("kamon-reporter-registry"))
private val metricsTickerSchedule = new AtomicReference[ScheduledFuture[_]]()
private val metricReporters = new ConcurrentLinkedQueue[ReporterEntry]()
private val spanReporters = new ConcurrentLinkedQueue[SpansReporter]()
private val reporterCounter = new AtomicLong(0L)
reconfigure(initialConfig)
override def loadFromConfig(): Unit = ???
override def add(reporter: MetricsReporter): Registration =
add(reporter, reporter.getClass.getName())
override def add(reporter: MetricsReporter, name: String): Registration = {
val executor = Executors.newSingleThreadExecutor(threadFactory(name))
val reporterEntry = ReporterEntry(
id = reporterCounter.getAndIncrement(),
reporter = reporter,
executionContext = ExecutionContext.fromExecutorService(executor)
)
metricReporters.add(reporterEntry)
new Registration {
val reporterID = reporterEntry.id
override def cancel(): Boolean = {
metricReporters.removeIf(entry => {
if(entry.id == reporterID) {
stopReporter(entry)
true
} else false
})
}
}
}
override def add(reporter: SpansReporter): Registration = {
spanReporters.add(reporter)
new Registration {
override def cancel(): Boolean = true
}
}
override def stopAll(): Future[Unit] = {
implicit val stopReporterExeContext = ExecutionContext.fromExecutor(registryExecutionContext)
val reporterStopFutures = Vector.newBuilder[Future[Unit]]
while(!metricReporters.isEmpty) {
val entry = metricReporters.poll()
if(entry != null) {
reporterStopFutures += stopReporter(entry)
}
}
Future.sequence(reporterStopFutures.result()).transform(_ => Try((): Unit))
}
private[kamon] def reconfigure(config: Config): Unit = synchronized {
val tickInterval = config.getDuration("kamon.metric.tick-interval")
val currentTicker = metricsTickerSchedule.get()
if(currentTicker != null) {
currentTicker.cancel(true)
}
// Reconfigure all registered reporters
metricReporters.forEach(entry =>
Future(entry.reporter.reconfigure(config))(entry.executionContext)
)
metricsTickerSchedule.set {
registryExecutionContext.scheduleAtFixedRate(
new MetricTicker(metrics, metricReporters), tickInterval.toMillis, tickInterval.toMillis, TimeUnit.MILLISECONDS
)
}
}
private[kamon] def reportSpan(span: Span.CompletedSpan): Unit = {
spanReporters.forEach(_.reportSpan(span))
}
private def stopReporter(entry: ReporterEntry): Future[Unit] = {
entry.isActive = false
Future(entry.reporter.stop())(entry.executionContext).andThen {
case _ => entry.executionContext.shutdown()
}(ExecutionContext.fromExecutor(registryExecutionContext))
}
private case class ReporterEntry(
@volatile var isActive: Boolean = true,
id: Long,
reporter: MetricsReporter,
executionContext: ExecutionContextExecutorService
)
private class MetricTicker(snapshotGenerator: MetricsSnapshotGenerator, reporterEntries: java.util.Queue[ReporterEntry]) extends Runnable {
val logger = Logger(classOf[MetricTicker])
var lastTick = Instant.now()
def run(): Unit = try {
val currentTick = Instant.now()
val tickSnapshot = TickSnapshot(
interval = Interval(lastTick, currentTick),
metrics = snapshotGenerator.snapshot()
)
reporterEntries.forEach { entry =>
Future {
if(entry.isActive)
entry.reporter.reportTickSnapshot(tickSnapshot)
}(executor = entry.executionContext)
}
lastTick = currentTick
} catch {
case NonFatal(t) => logger.error("Error while running a tick", t)
}
}
}
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