@Target(value=METHOD)
@Retention(value=RUNTIME)
public @interface PreQuery
Query
for any
of the specified kinds is executed against the datastore. If
kinds()
is not provided the callback will execute for queries against all kinds,
including kind-less queries. Methods with this annotation must return
void
, must accept a single argument of type
PreQueryContext
,
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.
Modifier and Type | Optional Element and Description |
---|---|
java.lang.String[]
|
kinds
The kinds to which this callback applies.
|