public interface PreGet implements AnnotationIdentifies a callback method to be invoked before an Entity of any of the specified kinds
is fetched from the datastore via a get() rpc. 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 PreGetContext, 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. |