public interface PrePut implements AnnotationIdentifies a callback method to be invoked before an Entity of any of the specified kinds
is written to the datastore. If #kinds() is not provided the callback will execute for
all kinds. Methods with this annotation must return void, must accept a single argument
of type PutContext, must not throw any checked exceptions, must not be static, and must
belong to a class with a no-arg constructor. Neither the method nor the no-arg constructor of the
class to which it belongs are required to be public. Methods with this annotation are free to
throw any unchecked exception they like. Throwing an unchecked exception will prevent callbacks
that have not yet been executed from running, and the exception will propagate to the code that
invoked the datastore operation that resulted in the invocation of the callback. Throwing an
unchecked exception from a callback will prevent the datastore operation from executing.
Implements
AnnotationMethods
kinds()
public abstract String[] kinds()The kinds to which this callback applies. The default value is an empty array, which indicates that the callback should run for all kinds.
| Returns | |
|---|---|
| Type | Description |
String[] |
The kinds to which this callback applies. |