org.springframework.context

接口 SmartLifecycle

所有超级接口:

Lifecycle, Phased

public interface SmartLifecycle
extends Lifecycle, Phased

An extension of the Lifecycle interface for those objects that require to be started upon ApplicationContext refresh and/or shutdown in a particular order. The isAutoStartup() return value indicates whether this object should be started at the time of a context refresh. The callback-accepting stop(Runnable) method is useful for objects that have an asynchronous shutdown process. Any implementation of this interface must invoke the callback's run() method upon shutdown completion to avoid unnecessary delays in the overall ApplicationContext shutdown.

This interface extends Phased, and the Phased.getPhase() method's return value indicates the phase within which this Lifecycle component should be started and stopped. The startup process begins with the lowest phase value and ends with the highest phase value (Integer.MIN_VALUE is the lowest possible, and Integer.MAX_VALUE is the highest possible). The shutdown process will apply the reverse order. Any components with the same value will be arbitrarily ordered within the same phase.

Example: if component B depends on component A having already started, then component A should have a lower phase value than component B. During the shutdown process, component B would be stopped before component A.

Any explicit "depends-on" relationship will take precedence over the phase order such that the dependent bean always starts after its dependency and always stops before its dependency.

Any Lifecycle components within the context that do not also implement SmartLifecycle will be treated as if they have a phase value of 0. That way a SmartLifecycle implementation may start before those Lifecycle components if it has a negative phase value, or it may start after those components if it has a positive phase value.

Note that, due to the auto-startup support in SmartLifecycle, a SmartLifecycle bean instance will usually get initialized on startup of the application context in any case. As a consequence, the bean definition lazy-init flag has very limited actual effect on SmartLifecycle beans.

从以下版本开始:

3.0

作者:

Mark Fisher

另请参阅:

LifecycleProcessor, ConfigurableApplicationContext

方法概要

限定符和类型	方法和说明
boolean	isAutoStartup() Returns true if this Lifecycle component should get started automatically by the container at the time that the containing ApplicationContext gets refreshed.
void	stop(Runnable callback) Indicates that a Lifecycle component must stop if it is currently running.

从接口继承的方法 org.springframework.context.Lifecycle

isRunning, start, stop

从接口继承的方法 org.springframework.context.Phased

getPhase

方法详细资料

isAutoStartup

boolean isAutoStartup()

Returns true if this Lifecycle component should get started automatically by the container at the time that the containing ApplicationContext gets refreshed.

A value of false indicates that the component is intended to be started through an explicit Lifecycle.start() call instead, analogous to a plain Lifecycle implementation.

另请参阅:

Lifecycle.start(), Phased.getPhase(), LifecycleProcessor.onRefresh(), ConfigurableApplicationContext.refresh()

stop

void stop(Runnable callback)

Indicates that a Lifecycle component must stop if it is currently running.

The provided callback is used by the LifecycleProcessor to support an ordered, and potentially concurrent, shutdown of all components having a common shutdown order value. The callback must be executed after the SmartLifecycle component does indeed stop.

The LifecycleProcessor will call only this variant of the stop method; i.e. Lifecycle.stop() will not be called for SmartLifecycle implementations unless explicitly delegated to within the implementation of this method.

另请参阅:

Lifecycle.stop(), Phased.getPhase()