Java API: Add an actor termination task to a phase. It doesn't remove previously added tasks. Tasks added to the same phase are executed in parallel without any ordering assumptions. Next phase will not start until all tasks of previous phase have been completed.

When executed, this task will first send the given stop message, if defined, to the actor, then it will watch the actor, and complete when the actor terminates.

Tasks should typically be registered as early as possible after system startup. When running the coordinated shutdown tasks that have been registered will be performed but tasks that are added too late will not be run. It is possible to add a task to a later phase by a task in an earlier phase and it will be performed.

Scala API: Add an actor termination task to a phase. It doesn't remove previously added tasks. Tasks added to the same phase are executed in parallel without any ordering assumptions. Next phase will not start until all tasks of previous phase have been completed.

When executed, this task will first send the given stop message, if defined, to the actor, then it will watch the actor, and complete when the actor terminates.

Tasks should typically be registered as early as possible after system startup. When running the coordinated shutdown tasks that have been registered will be performed but tasks that are added too late will not be run. It is possible to add a task to a later phase by a task in an earlier phase and it will be performed.

Java API: Add a JVM shutdown hook that will be run when the JVM process begins its shutdown sequence. Added hooks may run in an order concurrently, but they are running before Akka internal shutdown hooks, e.g. those shutting down Artery.

The returned Cancellable makes it possible to de-register the hook. For example on actor system shutdown to avoid leaking references to the actor system in tests.

For shutdown hooks that does not have any requirements on running before the Akka shutdown hooks the standard library JVM shutdown hooks APIs are better suited.

Scala API: Add a JVM shutdown hook that will be run when the JVM process begins its shutdown sequence. Added hooks may run in any order concurrently, but they are running before Akka internal shutdown hooks, e.g. those shutting down Artery.

The returned Cancellable makes it possible to de-register the hook. For example on actor system shutdown to avoid leaking references to the actor system in tests.

For shutdown hooks that does not have any requirements on running before the Akka shutdown hooks the standard library JVM shutdown hooks APIs are better suited.

Java API: Add a task to a phase, returning an object which will cancel it on demand and remove it from the task pool (so long as the same task has not been added elsewhere). Tasks in a phase are run concurrently, with no ordering assumed.

Adding a task to a phase does not remove any other tasks from the phase.

If the same task is added multiple times, each addition will be run unless cancelled.

Tasks should typically be registered as early as possible -- once coordinated shutdown begins, tasks may be added without ever being run. A task may add tasks to a later stage with confidence that they will be run.

Scala API: Add a task to a phase, returning an object which will cancel it on demand and remove it from the task pool (so long as the same task has not been added elsewhere). Tasks in a phase are run concurrently, with no ordering assumed.

Adding a task to a phase does not remove any other tasks from the phase.

If the same task is added multiple times, each addition will be run unless cancelled.

Tasks should typically be registered as early as possible -- once coordinated shutdown begins, tasks may be added without ever being run. A task may add tasks to a later stage with confidence that they will be run.

Java API: Add a JVM shutdown hook that will be run when the JVM process begins its shutdown sequence. Added hooks may run in any order concurrently, but they are running before Akka internal shutdown hooks, e.g. those shutting down Artery.

Scala API: Add a JVM shutdown hook that will be run when the JVM process begins its shutdown sequence. Added hooks may run in any order concurrently, but they are running before Akka internal shutdown hooks, e.g. those shutting down Artery.

Java API: Add a task to a phase. It doesn't remove previously added tasks. Tasks added to the same phase are executed in parallel without any ordering assumptions. Next phase will not start until all tasks of previous phase have been completed.

Tasks should typically be registered as early as possible after system startup. When running the coordinated shutdown tasks that have been registered will be performed but tasks that are added too late will not be run. It is possible to add a task to a later phase by a task in an earlier phase and it will be performed.

Scala API: Add a task to a phase. It doesn't remove previously added tasks. Tasks added to the same phase are executed in parallel without any ordering assumptions. Next phase will not start until all tasks of previous phase have been completed.

Tasks should typically be registered as early as possible after system startup. When running the coordinated shutdown tasks that have been registered will be performed but tasks that are added too late will not be run. It is possible to add a task to a later phase by a task in an earlier phase and it will be performed.

The Reason for the shutdown as passed to the run method. Optional.empty if the shutdown has not been started.

Java API: Run tasks of all phases including and after the given phase. The returned CompletionStage is completed when all such tasks have been completed, or there is a failure when recovery is disabled.

It's safe to call this method multiple times. It will only run the shutdown sequence once.

Scala API: Run tasks of all phases including and after the given phase. The returned Future is completed when all such tasks have been completed, or there is a failure when recovery is disabled.

It's safe to call this method multiple times. It will only run shutdown sequence once.

Scala API: Run tasks of all phases. The returned Future is completed when all tasks have been completed, or there is a failure when recovery is disabled.

It's safe to call this method multiple times. It will only run the shutdown sequence once.

Java API: Run tasks of all phases. The returned CompletionStage is completed when all tasks have been completed, or there is a failure when recovery is disabled.

It's safe to call this method multiple times. It will only run the shutdown sequence once.

The Reason for the shutdown as passed to the run method. None if the shutdown has not been started.

The configured timeout for a given phase. For example useful as timeout when actor ask requests is used as a task.