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@Target(value=METHOD) @Retention(value=RUNTIME) public @interface PreGet
Identifies 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.
Optional Element Summary | |
---|---|
java.lang.String[] |
kinds
The kinds to which this callback applies. |
public abstract java.lang.String[] kinds
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SUMMARY: REQUIRED | OPTIONAL | DETAIL: ELEMENT |