Packages

  • package root
    Definition Classes
    root
  • package play

    Play framework.

    Play framework.

    Play

    http://www.playframework.com

    Definition Classes
    root
  • package api

    Contains the public API for Scala developers.

    Contains the public API for Scala developers.

    Access the current Play application 
    import play.api.Play.current
    Read configuration 
    val poolSize = configuration.getInt("engine.pool.size")
    Use the logger 
    Logger.info("Hello!")
    Define a Plugin 
    class MyPlugin(app: Application) extends Plugin
    Create adhoc applications (for testing) 
    val application = Application(new File("."), this.getClass.getClassloader, None, Play.Mode.DEV)
    Definition Classes
    play
  • package inject

    Play's runtime dependency injection abstraction.

    Play's runtime dependency injection abstraction.

    Play's runtime dependency injection support is built on JSR-330, which provides a specification for declaring how dependencies get wired to components. JSR-330 however does not address how components are provided to or located by a DI container. Play's API seeks to address this in a DI container agnostic way.

    The reason for providing this abstraction is so that Play, the modules it provides, and third party modules can all express their bindings in a way that is not specific to any one DI container.

    Components are bound in the DI container. Each binding is identified by a BindingKey, which is typically an interface that the component implements, and may be optionally qualified by a JSR-330 qualifier annotation. A binding key is bound to a BindingTarget, which describes how the implementation of the interface that the binding key represents is constructed or provided. Bindings may also be scoped using JSR-330 scope annotations.

    Bindings are provided by instances of Module.

    Out of the box, Play provides an implementation of this abstraction using Guice.

    Definition Classes
    api
    See also

    The Module class for information on how to provide bindings.

  • package guice
    Definition Classes
    inject
  • ApplicationLifecycle
  • Binding
  • BindingKey
  • BindingKeyTarget
  • BindingTarget
  • BuiltinModule
  • ConfigProvider
  • ConfigurationProvider
  • ConstructionTarget
  • DefaultApplicationLifecycle
  • Injector
  • Module
  • Modules
  • NewInstanceInjector
  • ProviderConstructionTarget
  • ProviderTarget
  • QualifierAnnotation
  • QualifierClass
  • QualifierInstance
  • RoutesProvider
  • SimpleInjector
  • SimpleModule
t

play.api.inject

ApplicationLifecycle

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())
  }

  ...
}
Source
ApplicationLifecycle.scala
Linear Supertypes
AnyRef, Any
Known Subclasses
DefaultApplicationLifecycle
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Abstract Value Members

  1. 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.

  2. 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 stop are 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.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. 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.

  5. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  6. def asJava: inject.ApplicationLifecycle

    returns

    the Java version for this Application Lifecycle.

  7. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  10. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
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    Annotations
    @throws( classOf[java.lang.Throwable] )
  11. final def getClass(): Class[_]
    Definition Classes
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    Annotations
    @native()
  12. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  13. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  14. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  15. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  16. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  17. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  18. def toString(): String
    Definition Classes
    AnyRef → Any
  19. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  20. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    Annotations
    @throws( ... )
  21. final def wait(arg0: Long): Unit
    Definition Classes
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    @throws( ... ) @native()

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