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Observer

Introduction

Observers allow you to observe all actions taken on individual entities. There are 2 stages for each action where "*ing" is executed before and "*ed" after the action. Keep in mind that observers are only notified while calling the action methods on single entities, not in queries!

Usage

Writing an observer

An observer needs to implement the Observer interface which comes with default methods you can implement.

class MyModelObserver implements Observer<MyModel> {
    public void created(MyModel entity){
        System.out.println("Created a new entity!");
    }
}

The available methods are:

  • creating(entity)
  • created(entity)
  • updating(entity)
  • updated(entity)
  • saving(entity)
  • saved(entity)
  • deleting(entity)
  • deleted(entity)
  • restoring(entity)
  • restored(entity)

Registering the observer

In order to register your observer you need to call the observe(observer) method of the Repo.

Repo.get(MyModel.class).observe(new MyModelObserver());