trait ApplicationLifecycle extends AnyRef
Application lifecycle register.
This is used to hook into Play lifecycle events, specifically, when Play is stopped. The reason Play only provides lifecycle callbacks for stopping is that constructors are considered the application start callback. This has several advantages:
- It simplifies implementation, if you want to start something, just do it in the constructor. - It simplifies state, there's no transitional state where an object has been created but not started yet. Hence, as long as you have a reference to something, it's safe to use it. - It solves startup dependencies in a type safe manner - the order that components must be started is enforced by the order that they must be instantiated due to the component graph.
Stop hooks are executed when the application is shutdown, in reverse from when they were registered. Due to this reverse ordering, a component can know that it is safe to use the components it depends on as long as it hasn't received a shutdown event.
To use this, declare a dependency on ApplicationLifecycle, and then register the stop hook when the component is started. For example:
import play.api.inject.ApplicationLifecycle import javax.inject.Inject class SomeDatabase @Inject() (applicationLifecycle: ApplicationLifecycle) { private val connectionPool = new SomeConnectionPool() applicationLifecycle.addStopHook { () => Future.successful(connectionPool.shutdown()) } ... }
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- abstract def addStopHook(hook: () => Future[_]): Unit
Add a stop hook to be called when the application stops.
Add a stop hook to be called when the application stops.
The stop hook should redeem the returned future when it is finished shutting down. It is acceptable to stop immediately and return a successful future.
- abstract def stop(): Future[_]
Call to shutdown the application and execute the registered hooks.
Call to shutdown the application and execute the registered hooks.
Since 2.7.0, implementations of
stopare expected to be idempotent so invoking the method several times only runs the process once.- returns
A future that will be redeemed once all hooks have executed.
- Annotations
- @deprecated
- Deprecated
(Since version 2.7.0) Do not invoke stop() directly. Instead, use CoordinatedShutdown.run to stop and release your resources.
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- def addStopHook(hook: Callable[_ <: CompletionStage[_]]): Unit
Add a stop hook to be called when the application stops.
Add a stop hook to be called when the application stops.
The stop hook should redeem the returned future when it is finished shutting down. It is acceptable to stop immediately and return a successful future.
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the Java version for this Application Lifecycle.
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(Since version 9)