net.java.html.json

Annotation Type ModelOperation

@Target(value=METHOD)
 @Retention(value=SOURCE)
public @interface ModelOperation

The threading model of classes generated by @Model requires that all operations are perform from the originating thread - unless they are invoked as @ModelOperation methods.

A method in a class annotated by @Model annotation may be annotated by @ModelOperation. The method has to be static, non-private and return void. The first parameter of the method must be the model class followed by any number of additional arguments.

As a result method of the same name and the same list of additional arguments (e.g. without the first model class one) will be generated into the model class. This method can be invoked on any thread, any time and it is the responsibility of model manipulating technology to ensure the model is available and only then call back to the original method annotated by @ModelOperation. The call may happen synchronously (if possible), or be delayed and invoked later (on appropriate dispatch thread), without blocking the caller.

 
 @Model(className="Names", properties={
   @Property(name = "names", type=String.class, array = true)
 })
 static class NamesModel {
   @ModelOperation static void updateNames(Names model, List<String;gt; arr) {
     // can safely access the model
     model.getNames().addAll(arr);
   }
 
   static void initialize() {
     final Names pageModel = new Names();
     pageModel.applyBindings();
 
     // spawn to different thread
     Executors.newSingleThreadExecutor().execute({
       List<String> arr = // ... obtain the names somewhere from network
       pageModel.updateNames(arr);
       // returns immediately, later it invokes the model operation
     });
 
   }
 }
 

Author:

Jaroslav Tulach