PostDelete (Google App Engine API for Java)
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@Target(value=METHOD)
@Retention(value=RUNTIME)
public @interface PostDelete
Identifies a callback method to be invoked after an
Entity
of any of the specified kinds
is deleted from 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
DeleteContext
, 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
not have any impact on the result of
the datastore operation. Methods with this annotation will not be invoked if the datastore
operation fails.
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Optional Element Summary
Optional Elements
Modifier and Type |
Optional Element and Description |
java.lang.String[] |
kinds
The kinds to which this callback applies.
|
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Last updated 2025-06-16 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-06-16 UTC."],[[["The `@PostDelete` annotation identifies a method to be called after an `Entity` is deleted from the datastore."],["Callback methods annotated with `@PostDelete` must return `void`, accept a `DeleteContext` argument, and belong to a class with a no-arg constructor."],["The `kinds()` element in `@PostDelete` specifies the entity kinds for which the callback should be triggered, defaulting to all kinds if not specified."],["Throwing an unchecked exception within a `@PostDelete` annotated method will stop subsequent callbacks, but not impact the original datastore operation."]]],[]]