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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.concurrent
import java.util.concurrent.{ Executor, ExecutorService }
import scala.annotation.implicitNotFound
/**
* An `ExecutionContext` is an abstraction over an entity that can execute program logic.
*/
@implicitNotFound("Cannot find an implicit ExecutionContext, either require one yourself or import ExecutionContext.Implicits.global")
trait ExecutionContext {
/** Runs a block of code on this execution context.
*/
def execute(runnable: Runnable): Unit
/** Reports that an asynchronous computation failed.
*/
def reportFailure(t: Throwable): Unit
/** Prepares for the execution of a task. Returns the prepared
* execution context. A valid implementation of `prepare` is one
* that simply returns `this`.
*/
def prepare(): ExecutionContext = this
}
/**
* Union interface since Java does not support union types
*/
trait ExecutionContextExecutor extends ExecutionContext with Executor
/**
* Union interface since Java does not support union types
*/
trait ExecutionContextExecutorService extends ExecutionContextExecutor with ExecutorService
/** Contains factory methods for creating execution contexts.
*/
object ExecutionContext {
/**
* This is the explicit global ExecutionContext,
* call this when you want to provide the global ExecutionContext explicitly
*/
def global: ExecutionContextExecutor = Implicits.global
object Implicits {
/**
* This is the implicit global ExecutionContext,
* import this when you want to provide the global ExecutionContext implicitly
*/
implicit lazy val global: ExecutionContextExecutor = impl.ExecutionContextImpl.fromExecutor(null: Executor)
}
/** Creates an `ExecutionContext` from the given `ExecutorService`.
*/
def fromExecutorService(e: ExecutorService, reporter: Throwable => Unit): ExecutionContextExecutorService =
impl.ExecutionContextImpl.fromExecutorService(e, reporter)
/** Creates an `ExecutionContext` from the given `ExecutorService` with the default Reporter.
*/
def fromExecutorService(e: ExecutorService): ExecutionContextExecutorService = fromExecutorService(e, defaultReporter)
/** Creates an `ExecutionContext` from the given `Executor`.
*/
def fromExecutor(e: Executor, reporter: Throwable => Unit): ExecutionContextExecutor =
impl.ExecutionContextImpl.fromExecutor(e, reporter)
/** Creates an `ExecutionContext` from the given `Executor` with the default Reporter.
*/
def fromExecutor(e: Executor): ExecutionContextExecutor = fromExecutor(e, defaultReporter)
/** The default reporter simply prints the stack trace of the `Throwable` to System.err.
*/
def defaultReporter: Throwable => Unit = (t: Throwable) => t.printStackTrace()
}
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