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package kamon
import java.time.Instant
import java.util.concurrent.{ConcurrentLinkedQueue, Executors, ThreadFactory, TimeUnit}
import com.typesafe.config.Config
import kamon.metric._
import org.slf4j.LoggerFactory
import scala.collection.concurrent.TrieMap
import scala.concurrent.{ExecutionContext, Future}
import scala.util.control.NonFatal
trait Reporters {
def loadFromConfig(): Unit
def stop(): Unit
def addReporter(subscriber: MetricsReporter): Cancellable
def addReporter(subscriber: MetricsReporter, name: String): Cancellable
}
class DummyReporter(name: String) extends MetricsReporter {
override def reconfigure(config: Config): Unit = {
println("NAME: " + name + "===> Reconfiguring Dummy")
}
override def start(config: Config): Unit = {
println("NAME: " + name + "===> Starting DUMMY")
}
override def stop(): Unit = {
println("NAME: " + name + "===> Stopping Dummy")
}
override def processTick(snapshot: TickSnapshot): Unit = {
println("NAME: " + name + s"===> [${Thread.currentThread().getName()}] Processing a tick in dummy." + snapshot)
println(s"From: ${snapshot.interval.from}, to: ${snapshot.interval.to}")
snapshot.entities.foreach { e =>
println(e.counters.map(c => s"Counter [${c.name}] => " + c.value).mkString(", "))
}
}
}
class ReportersRegistry(metrics: RecorderRegistryImpl) extends Reporters {
private val scheduler = Executors.newSingleThreadScheduledExecutor(threadFactory("kamon-scheduler"))
private val metricReporters = new ConcurrentLinkedQueue[ReporterEntry]()
private val mReporters = TrieMap.empty[String, MetricsReporter]
metricReporters.add(ReporterEntry(new DummyReporter("statsd"), createExecutionContext("statsd-reporter")))
startMetricsTicker()
override def loadFromConfig(): Unit = ???
override def stop(): Unit = ???
override def addReporter(subscriber: MetricsReporter): Cancellable = ???
override def addReporter(subscriber: MetricsReporter, name: String): Cancellable = {
???
}
private def createExecutionContext(name: String): ExecutionContext = {
val threadFactory = new ThreadFactory {
val defaultFactory = Executors.defaultThreadFactory()
override def newThread(r: Runnable): Thread = {
val thread = defaultFactory.newThread(r)
thread.setName(name)
thread
}
}
ExecutionContext.fromExecutor(Executors.newSingleThreadExecutor(threadFactory))
}
/**
* Creates a thread factory that assigns the specified name to all created Threads.
*/
private def threadFactory(name: String): ThreadFactory =
new ThreadFactory {
val defaultFactory = Executors.defaultThreadFactory()
override def newThread(r: Runnable): Thread = {
val thread = defaultFactory.newThread(r)
thread.setName(name)
thread
}
}
def reconfigure(config: Config): Unit = {}
private case class ReporterEntry(reporter: MetricsReporter, executionContext: ExecutionContext)
def startMetricsTicker(): Unit = {
scheduler.scheduleAtFixedRate(new MetricTicker(metrics, metricReporters), 2, 2, TimeUnit.SECONDS)
}
private class MetricTicker(metricsImpl: RecorderRegistryImpl, reporterEntries: java.util.Queue[ReporterEntry]) extends Runnable {
val logger = LoggerFactory.getLogger(classOf[MetricTicker])
var lastTick = Instant.now()
def run(): Unit = try {
val currentTick = Instant.now()
val tickSnapshot = TickSnapshot(
interval = Interval(lastTick, currentTick),
entities = metricsImpl.snapshot()
)
reporterEntries.forEach { entry =>
Future(entry.reporter.processTick(tickSnapshot))(executor = entry.executionContext)
}
lastTick = currentTick
} catch {
case NonFatal(t) => logger.error("Error while running a tick", t)
}
}
}
trait Cancellable {
def cancel(): Unit
}
trait MetricsReporter {
def reconfigure(config: Config): Unit
def start(config: Config): Unit
def stop(): Unit
def processTick(snapshot: TickSnapshot)
}
object TestingAllExample extends App {
val recorder = Kamon.metrics.getRecorder(Entity("topo", "human-being", Map.empty))
while(true) {
recorder.counter("test-other").increment()
Thread.sleep(100)
}
}
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