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Describe how to handle application events from descendant contexts

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Closes gh-8899
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Andy Wilkinson 2017-10-20 10:29:06 +01:00
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spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc
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@ -242,6 +242,17 @@ Application events are sent in the following order, as your application runs:
TIP: You often won't need to use application events, but it can be handy to know that they
exist. Internally, Spring Boot uses events to handle a variety of tasks.
Application events are sent using Spring Framework's event publishing mechanism. Part of
this mechanism ensures that an event published to the listeners in a child context
is also published to the listeners in any ancestors contexts. As a result of this, if
your application uses a hierarchy of `SpringApplication` instances, a listener may
receive multiple instances of the same type of application event.
To allow your listener to distinguish between an event for its context and an event for
a descendant context, it should request that its application context is injected and
then compare the injected context with context of the event. The context can be injected
by implementing `ApplicationContextAware` or, if the listener is a bean, using `@Autowired`.
[[boot-features-web-environment]]