packages/oo7/src/readyBond.js
// (C) Copyright 2016-2017 Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
const Bond = require('./bond');
/**
* Derivative {@link Bond} representing the readiness of another {@link Bond}.
*/
class ReadyBond extends Bond {
constructor (targetBond) {
super(false);
this._poll = () => this.changed(targetBond._ready);
this._targetBond = targetBond;
}
initialise () {
this._notifyId = this._targetBond.notify(this._poll);
this._poll();
}
finalise () {
this._targetBond.unnotify(this._notifyId);
}
}
module.exports = ReadyBond;