1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
package kamon
import java.time.Instant
import java.util.concurrent.atomic.{AtomicLong, AtomicReference}
import java.util.concurrent._
import com.typesafe.config.Config
import kamon.metric._
import org.slf4j.LoggerFactory
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 stopAll(): Future[Unit]
}
class ReporterRegistryImpl(metrics: RecorderRegistryImpl, 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 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 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 def stopReporter(entry: ReporterEntry): Future[Unit] = {
entry.isActive = false
Future(entry.reporter.stop())(entry.executionContext).andThen {
case _ => entry.executionContext.shutdown()
}(ExecutionContext.fromExecutor(registryExecutionContext))
}
/**
* 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
}
}
private case class ReporterEntry(
@volatile var isActive: Boolean = true,
id: Long,
reporter: MetricsReporter,
executionContext: ExecutionContextExecutorService
)
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 {
if(entry.isActive)
entry.reporter.processTick(tickSnapshot)
}(executor = entry.executionContext)
}
lastTick = currentTick
} catch {
case NonFatal(t) => logger.error("Error while running a tick", t)
}
}
}
trait Registration {
def cancel(): Boolean
}
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))
val registration = Kamon.reporters.add(new DummyReporter("test"))
var x = 0
while(true) {
recorder.counter("test-other").increment()
Thread.sleep(100)
x += 1
if(x == 50) {
registration.cancel()
}
if(x == 100) {
println("Stopping all reporters")
Kamon.reporters.stopAll()
}
}
}
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(", "))
}
}
}
|
