diff --git a/src/reference/docbook/events.xml b/src/reference/docbook/events.xml new file mode 100644 index 000000000..6478a7afd --- /dev/null +++ b/src/reference/docbook/events.xml @@ -0,0 +1,137 @@ + + + + Events + + There are six different events that the REST exporter emits throughout the process of working with an entity. + Those are: + + + + BeforeCreateEvent + + + AfterCreateEvent + + + BeforeSaveEvent + + + AfterSaveEvent + + + BeforeLinkSaveEvent + + + AfterLinkSaveEvent + + + BeforeDeleteEvent + + + AfterDeleteEvent + + + + +
+ Writing an + <classname>ApplicationListener</classname> + + + There is an abstract class you can subclass which listens for these kinds of events and calls + the appropriate method based on the event type. You just override the methods for + the events you're interested in. + + + + + One thing to note with this approach, however, is that it makes no distinction based on + the type of the entity. You'll have to inspect that yourself. + + +
+ +
+ Writing an annotated handler + + Another approach is to use an annotated handler, which does filter events based on domain type. + + To declare a handler, create a POJO and put the + @RepositoryEventHandler + annotation on it. This tells the + BeanPostProcessor + that this class needs to be inspected for handler methods. + + + Once it finds a bean with this annotation, it iterates over the exposed methods and looks for + annotations that correspond to the event you're interested in. For example, to handle BeforeSaveEvents + in an annotated POJO for different kinds of domain types, you'd define your class like this: + + + + + You can also declare the domain type at the class level: + + + + + Just declare an instance of your annotated bean in your + ApplicationContext + and the + BeanPostProcessor + that is by default created in + RepositoryRestMvcConfiguration + will inspect the bean for handlers and wire them to the correct events. + + + +
+ + \ No newline at end of file diff --git a/src/reference/docbook/index.xml b/src/reference/docbook/index.xml index 189e86074..b0522efce 100644 --- a/src/reference/docbook/index.xml +++ b/src/reference/docbook/index.xml @@ -47,6 +47,7 @@ + \ No newline at end of file diff --git a/src/reference/docbook/validation.xml b/src/reference/docbook/validation.xml index d7fdf9f01..3d1f9490b 100644 --- a/src/reference/docbook/validation.xml +++ b/src/reference/docbook/validation.xml @@ -6,23 +6,44 @@ Validation - Integrating validation into Spring Data REST is as easy as registering your + There are two ways to register a Validator - implementation with the - ValidatingRepositoryEventListener, whose job it is to trigger - validators whenever certain events happen inside Spring Data REST. + instance in Spring Data REST: wire it by bean name or register the validator manually. For the majority of cases, + the simple bean name prefix style will be sufficient. - To add your validators, override the - configureValidatingRepositoryEventListener - method and call the - addValidator - method: + In order to tell Spring Data REST you want a particular + Validator + assigned to a particular event, you simply prefix the bean name with the event you're interested in. For example, to + validate instances of the + Person + class before new ones are saved into the repository, you would declare an instance of a + Validator<Person> + in your + ApplicationContext + with the bean name "beforeCreatePersonValidator". Since the prefix "beforeCreate" matches a known Spring Data REST + event, that validator will be wired to the correct event. + - + Assigning Validators manually + + If you would rather not use the bean name prefix approach, then you simply need to register an instance of + your validator with the bean who's job it is to invoke validators after the correct event. In your configuration + that subclasses Spring Data REST's + RepositoryRestMvcConfiguration, override the + configureValidatingRepositoryEventListener + method and call the + addValidator + method on the + ValidatingRepositoryEventListener, passing the event you want this validator + to be triggered on, and an instance of the validator. + + - + + \ No newline at end of file