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package cask.actor
import java.util.concurrent.{Executors, ThreadFactory, TimeUnit}
import scala.concurrent.duration.Duration
import scala.concurrent.{Await, CanAwait, ExecutionContext, Future, Promise}
import scala.util.Try
/**
* An extended `scala.concurrent.ExecutionContext`; provides the ability to
* schedule messages to be sent later, and hooks to track the current number of
* outstanding tasks or log the actor message sends for debugging purporses
*/
trait Context extends ExecutionContext {
def reportSchedule(): Context.Token = new Context.Token.Simple()
def reportSchedule(fileName: sourcecode.FileName,
line: sourcecode.Line): Context.Token = {
new Context.Token.Future(fileName, line)
}
def reportSchedule(a: Actor[_],
msg: Any,
fileName: sourcecode.FileName,
line: sourcecode.Line): Context.Token = {
new Context.Token.Send(a, msg, fileName, line)
}
def reportRun(a: Actor[_],
msg: Any,
token: Context.Token): Unit = ()
def reportComplete(token: Context.Token): Unit = ()
def scheduleMsg[T](a: Actor[T], msg: T, time: java.time.Duration)
(implicit fileName: sourcecode.FileName,
line: sourcecode.Line): Unit
def future[T](t: => T)
(implicit fileName: sourcecode.FileName,
line: sourcecode.Line): Future[T]
def execute(runnable: Runnable): Unit
}
object Context{
trait Token
object Token{
class Simple extends Token(){
override def toString = "token@" + Integer.toHexString(hashCode())
}
class Future(val fileName: sourcecode.FileName,
val line: sourcecode.Line) extends Token(){
override def toString =
"token@" + Integer.toHexString(hashCode()) + "@" +
fileName.value + ":" + line.value
}
class Send(val a: Actor[_],
val msg: Any,
val fileName: sourcecode.FileName,
val line: sourcecode.Line) extends Token(){
override def toString =
"token@" + Integer.toHexString(hashCode()) + "@" +
fileName.value + ":" + line.value
}
}
class Simple(ec: ExecutionContext, logEx: Throwable => Unit) extends Context.Impl {
def executionContext = ec
def reportFailure(t: Throwable) = logEx(t)
}
object Simple{
implicit val global: Simple = new Simple(scala.concurrent.ExecutionContext.Implicits.global, _.printStackTrace())
}
class Test(ec: ExecutionContext = scala.concurrent.ExecutionContext.global,
logEx: Throwable => Unit = _.printStackTrace()) extends Context.Impl {
private[this] val active = collection.mutable.Set.empty[Context.Token]
private[this] var promise = concurrent.Promise.successful[Unit](())
def executionContext = ec
def reportFailure(t: Throwable) = logEx(t)
def handleReportSchedule(token: Context.Token) = synchronized{
if (active.isEmpty) {
assert(promise.isCompleted)
promise = concurrent.Promise[Unit]
}
active.add(token)
token
}
override def reportSchedule() = {
handleReportSchedule(super.reportSchedule())
}
override def reportSchedule(fileName: sourcecode.FileName,
line: sourcecode.Line): Context.Token = {
handleReportSchedule(super.reportSchedule(fileName, line))
}
override def reportSchedule(a: Actor[_],
msg: Any,
fileName: sourcecode.FileName,
line: sourcecode.Line): Context.Token = {
handleReportSchedule(super.reportSchedule(a, msg, fileName, line))
}
override def reportComplete(token: Context.Token) = this.synchronized{
assert(active.remove(token))
if (active.isEmpty) promise.success(())
}
def waitForInactivity(timeout: Option[java.time.Duration] = None) = {
Await.result(
this.synchronized(promise).future,
timeout match{
case None => scala.concurrent.duration.Duration.Inf
case Some(t) => scala.concurrent.duration.Duration.fromNanos(t.toNanos)
}
)
}
}
trait Impl extends Context {
def executionContext: ExecutionContext
def execute(runnable: Runnable): Unit = {
val token = reportSchedule()
executionContext.execute(new Runnable {
def run(): Unit = {
try runnable.run()
finally reportComplete(token)
}
})
}
def future[T](t: => T)
(implicit fileName: sourcecode.FileName,
line: sourcecode.Line): Future[T] = {
val token = reportSchedule(fileName, line)
val p = Promise[T]
executionContext.execute(new Runnable {
def run(): Unit = {
p.complete(scala.util.Try(t))
reportComplete(token)
}
})
p.future
}
lazy val scheduler = Executors.newSingleThreadScheduledExecutor(
new ThreadFactory {
def newThread(r: Runnable): Thread = {
val t = new Thread(r, "ActorContext-Scheduler-Thread")
t.setDaemon(true)
t
}
}
)
def scheduleMsg[T](a: Actor[T],
msg: T, delay: java.time.Duration)
(implicit fileName: sourcecode.FileName,
line: sourcecode.Line) = {
val token = reportSchedule(a, msg, fileName, line)
scheduler.schedule[Unit](
() => {
a.send(msg)(fileName, line)
reportComplete(token)
},
delay.toMillis,
TimeUnit.MILLISECONDS
)
}
}
}
trait Actor[T]{
def send(t: T)
(implicit fileName: sourcecode.FileName,
line: sourcecode.Line): Unit
def sendAsync(f: scala.concurrent.Future[T])
(implicit fileName: sourcecode.FileName,
line: sourcecode.Line): Unit
}
|
