Ember-weak-ref

THIS PROJECT IS CURRENTLY EXPERIMENTAL. PLEASE SUBMIT FEEDBACK.

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WeakRef implementation for ember objects. Allowing a mixture of long-running and short running tasks to exist, without strongly retaining all parties.

Installation

• ember install ember-weak-ref

Examples

note: with real ES6 proxies, the api becomes nicer

basic example

import WeakMixin from 'ember-weak-ref/mixin';
 
const Foo = Ember.Object.extend(WeakMixin);
 
let foo = Foo.create();
 
const weak = foo.weakRef();
 
someAsync(function() {
  weak.invoke('toString')
  // => undefined, or the value of foo.toString(), depending on if foo is gone
  or not.
});

more advanced example

It is common, to want to create a weak reference to this, unfortunately this requires a second scope. To make this easier, obj.weak(fn) yields the WeakReference as its argument.

note: be sure not to close over anything you don't want to retain (other weak refs are ok)

export default Component.extend({
  actions: {
    save() {
      this.set('saving', true);
 
      this.weak(async (component) => {
        try {
          let model = await component.invoke('saveModel');
        } finally {
          // ignore these operations, if
          // * the this.weak('save') is invoked again, resulting in a new operation id
          // * the component is destroyed
          // * if the compnoent has been released
          component.set('saving',  false);
        }
      });
    }
  }
})