If your application needs finer-grained control over JSON deserialization than you can achieve via
formatting annotations like @JsonbDateFormat, you may plug in your own custom instances of the Jsonb class
for each input type that your GraphQL application exposes.
To do this, you'll need to create an implementation of io.smallrye.graphql.spi.EventingService
and implement its overrideJsonbConfig method.
An example that plugs in a custom date format for a particular class that is used as input:
public class CustomJsonbService implements EventingService {
@Override
public String getConfigKey() {
return null; // activate this service always regardless of the configuration
}
@Override
public Map<String, Jsonb> overrideJsonbConfig() {
JsonbConfig config = new JsonbConfig().withDateFormat("MM dd yyyy HH:mm Z", null);
return Collections.singletonMap("org.example.model.MyModelClass", JsonbBuilder.create(config));
}
}
As the discovery of eventing services uses the ServiceLoader mechanism, don't forget to add a
META-INF/services/io.smallrye.graphql.spi.EventingService file that contains the fully qualified
name of your implementation.