The ExecutionModel is a specification of how run-loops and producers should behave in regards to executing tasks either synchronously or asynchronously.

Schedules a task to run in the future, after initialDelay.

For example the following schedules a message to be printed to standard output after 5 minutes:

val task = scheduler.scheduleOnce(5, TimeUnit.MINUTES, new Runnable {
  def run() = print("Hello, world!")
})

// later if you change your mind ...
task.cancel()

Returns a Future that will be complete when all tasks have completed execution after a shutdown request, or the timeout occurs, or the thread awaiting the shutdown is interrupted, whichever happens first.

NOTE that this method does not block the current thread, unlike the similarly named method in Java's ExecutionService. This is because Monix has a strict non-blocking policy, due to the fact that other platforms like Javascript cannot block threads.

Because of the non-blocking requirement, this method returns a Future result. And on top of the JVM in order to block on such a result, you can just use Scala's Await.result:

import scala.concurrent.Await
import scala.concurrent.duration._
import monix.execution.Scheduler.global

val wasTerminated =
  Await.result(service.awaitTermination(30.seconds, global), Duration.Inf)

Given the asynchronous execution requirement, the awaitOn parameter is a Scheduler that's going to be used for terminating this service and completing our Future. Obviously we cannot reuse this service for awaiting on termination, but Monix's Scheduler.global can always be used for this.

Returns the current time in milliseconds. Note that while the unit of time of the return value is a millisecond, the granularity of the value depends on the underlying operating system and may be larger. For example, many operating systems measure time in units of tens of milliseconds.

It's the equivalent of System.currentTimeMillis(). When wanting to measure time, do not use System.currentTimeMillis() directly, prefer this method instead, because then it can be mocked for testing purposes (see for example TestScheduler)

Schedules the given command for execution at some time in the future.

The command may execute in a new thread, in a pooled thread, in the calling thread, basically at the discretion of the Scheduler implementation.

Returns true if this scheduler has been shut down.

Returns true if all tasks have completed following shut down. Note that isTerminated is never true unless shutdown was called first.

Reports that an asynchronous computation failed.

Schedules a periodic task that becomes enabled first after the given initial delay, and subsequently with the given period. Executions will commence after initialDelay then initialDelay + period, then initialDelay + 2 * period and so on.

If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via cancellation or termination of the scheduler. If any execution of this task takes longer than its period, then subsequent executions may start late, but will not concurrently execute.

For example the following schedules a message to be printed to standard output approximately every 10 seconds with an initial delay of 5 seconds:

val task = scheduler.scheduleAtFixedRate(5, 10, TimeUnit.SECONDS, new Runnable {
  def run() = print("Repeated message")
})

// later if you change your mind ...
task.cancel()

Schedules for execution a periodic task that is first executed after the given initial delay and subsequently with the given delay between the termination of one execution and the commencement of the next.

For example the following schedules a message to be printed to standard output every 10 seconds with an initial delay of 5 seconds:

val task = s.scheduleWithFixedDelay(5, 10, TimeUnit.SECONDS, new Runnable {
  def run() = print("Repeated message")
})

// later if you change your mind ...
task.cancel()

Initiates an orderly shutdown in which previously submitted tasks are executed, but no new tasks will be accepted.

This method does not wait for previously submitted tasks to complete execution. Use awaitTermination to do that.

Given a function that will receive the underlying ExecutionModel, returns a new Scheduler reference, based on the source, that exposes the transformed ExecutionModel when queried by means of the executionModel property.

This method enables reusing global scheduler references in a local scope, but with a slightly modified execution model to inject.

The contract of this method (things you can rely on):

1. the source Scheduler must not be modified in any way
2. the implementation should wrap the source efficiently, such that the result mirrors the source Scheduler in every way except for the execution model

Sample:

import monix.execution.Scheduler.global

implicit val scheduler = {
  val em = global.executionModel
  global.withExecutionModel(em.withAutoCancelableLoops(true))
}