Replace java/scheduler.md with a symlink to scala/scheduler.md

akka-docs/src/main/paradox/java/scheduler.md

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-# Scheduler
-
-Sometimes the need for making things happen in the future arises, and where do
-you go look then?  Look no further than `ActorSystem`! There you find the
-`scheduler` method that returns an instance of
-`akka.actor.Scheduler`, this instance is unique per ActorSystem and is
-used internally for scheduling things to happen at specific points in time.
-
-You can schedule sending of messages to actors and execution of tasks
-(functions or Runnable).  You will get a `Cancellable` back that you can call
-`cancel` on to cancel the execution of the scheduled operation.
-
-The scheduler in Akka is designed for high-throughput of thousands up to millions 
-of triggers. The prime use-case being triggering Actor receive timeouts, Future timeouts,
-circuit breakers and other time dependent events which happen all-the-time and in many 
-instances at the same time. The implementation is based on a Hashed Wheel Timer, which is
-a known datastructure and algorithm for handling such use cases, refer to the [Hashed and Hierarchical Timing Wheels](http://www.cs.columbia.edu/~nahum/w6998/papers/sosp87-timing-wheels.pdf) 
-whitepaper by Varghese and Lauck if you'd like to understand its inner workings. 
-
-The Akka scheduler is **not** designed for long-term scheduling (see [akka-quartz-scheduler](https://github.com/enragedginger/akka-quartz-scheduler) 
-instead for this use case) nor is it to be used for higly precise firing of the events.
-The maximum amount of time into the future you can schedule an event to trigger is around 8 months,
-which in practice is too much to be useful since this would assume the system never went down during that period.
-If you need long-term scheduling we highly recommend looking into alternative schedulers, as this
-is not the use-case the Akka scheduler is implemented for.
-
-@@@ warning
-
-The default implementation of `Scheduler` used by Akka is based on job
-buckets which are emptied according to a fixed schedule.  It does not
-execute tasks at the exact time, but on every tick, it will run everything
-that is (over)due.  The accuracy of the default Scheduler can be modified
-by the `akka.scheduler.tick-duration` configuration property.
-
-@@@
-
-## Some examples
-
-Scala
-:  @@snip [SchedulerDocSpec.scala]($code$/scala/docs/actor/SchedulerDocSpec.scala) { #imports1 }
-
-Java
-:  @@snip [SchedulerDocTest.java]($code$/java/jdocs/actor/SchedulerDocTest.java) { #imports1 }
-
-Schedule to send the "foo"-message to the testActor after 50ms:
-
-Scala
-:  @@snip [SchedulerDocSpec.scala]($code$/scala/docs/actor/SchedulerDocSpec.scala) { #schedule-one-off-message } 
-
-Java
-:  @@snip [SchedulerDocTest.java]($code$/java/jdocs/actor/SchedulerDocTest.java) { #schedule-one-off-message }
-
-Schedule a @scala[function]@java[`Runnable`], that sends the current time to the testActor, to be executed after 50ms:
-
-Scala
-:  @@snip [SchedulerDocSpec.scala]($code$/scala/docs/actor/SchedulerDocSpec.scala) { #schedule-one-off-thunk }
-
-Java
-:  @@snip [SchedulerDocTest.java]($code$/java/jdocs/actor/SchedulerDocTest.java) { #schedule-one-off-thunk }
-
-Schedule to send the "Tick"-message to the `tickActor` after 0ms repeating every 50ms:
-
-Scala
-:  @@snip [SchedulerDocSpec.scala]($code$/scala/docs/actor/SchedulerDocSpec.scala) { #schedule-recurring }
-
-Java
-:  @@snip [SchedulerDocTest.java]($code$/java/jdocs/actor/SchedulerDocTest.java) { #schedule-recurring }
-
-@@@ warning
-
-If you schedule functions or Runnable instances you should be extra careful
-to not close over unstable references. In practice this means not using `this`
-inside the closure in the scope of an Actor instance, not accessing `sender()` directly
-and not calling the methods of the Actor instance directly. If you need to
-schedule an invocation schedule a message to `self` instead (containing the
-necessary parameters) and then call the method when the message is received.
-
-@@@
-
-## From `akka.actor.ActorSystem`
-
-@@snip [ActorSystem.scala]($akka$/akka-actor/src/main/scala/akka/actor/ActorSystem.scala) { #scheduler }
-
-@@@ warning
-
-All scheduled task will be executed when the `ActorSystem` is terminated, i.e.
-the task may execute before its timeout.
-
-@@@
-
-## The Scheduler interface
-
-The actual scheduler implementation is loaded reflectively upon
-`ActorSystem` start-up, which means that it is possible to provide a
-different one using the `akka.scheduler.implementation` configuration
-property. The referenced class must implement the following interface:
-
-Scala
-:  @@snip [Scheduler.scala]($akka$/akka-actor/src/main/scala/akka/actor/Scheduler.scala) { #scheduler }
-
-Java
-:  @@snip [AbstractScheduler.java]($akka$/akka-actor/src/main/java/akka/actor/AbstractScheduler.java) { #scheduler }
-
-## The Cancellable interface
-
-Scheduling a task will result in a `Cancellable` (or throw an
-`IllegalStateException` if attempted after the scheduler’s shutdown).
-This allows you to cancel something that has been scheduled for execution.
-
-@@@ warning
-
-This does not abort the execution of the task, if it had already been
-started.  Check the return value of `cancel` to detect whether the
-scheduled task was canceled or will (eventually) have run.
-
-@@@
-
-@@snip [Scheduler.scala]($akka$/akka-actor/src/main/scala/akka/actor/Scheduler.scala) { #cancellable }

akka-docs/src/main/paradox/java/scheduler.md

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+../scala/scheduler.md