60 lines
1.6 KiB
JavaScript
60 lines
1.6 KiB
JavaScript
|
/**
|
||
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
||
|
|
*
|
||
|
|
* This source code is licensed under the MIT license found in the
|
||
|
|
* LICENSE file in the root directory of this source tree.
|
||
|
|
*
|
||
|
|
* @format
|
||
|
|
* @flow
|
||
|
|
*/
|
||
|
|
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
const EventSubscription = require('./EventSubscription');
|
||
|
|
|
||
|
|
import type EventEmitter from './EventEmitter';
|
||
|
|
import type EventSubscriptionVendor from './EventSubscriptionVendor';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* EmitterSubscription represents a subscription with listener and context data.
|
||
|
|
*/
|
||
|
|
class EmitterSubscription extends EventSubscription {
|
||
|
|
emitter: EventEmitter;
|
||
|
|
listener: Function;
|
||
|
|
context: ?Object;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @param {EventEmitter} emitter - The event emitter that registered this
|
||
|
|
* subscription
|
||
|
|
* @param {EventSubscriptionVendor} subscriber - The subscriber that controls
|
||
|
|
* this subscription
|
||
|
|
* @param {function} listener - Function to invoke when the specified event is
|
||
|
|
* emitted
|
||
|
|
* @param {*} context - Optional context object to use when invoking the
|
||
|
|
* listener
|
||
|
|
*/
|
||
|
|
constructor(
|
||
|
|
emitter: EventEmitter,
|
||
|
|
subscriber: EventSubscriptionVendor,
|
||
|
|
listener: Function,
|
||
|
|
context: ?Object,
|
||
|
|
) {
|
||
|
|
super(subscriber);
|
||
|
|
this.emitter = emitter;
|
||
|
|
this.listener = listener;
|
||
|
|
this.context = context;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Removes this subscription from the emitter that registered it.
|
||
|
|
* Note: we're overriding the `remove()` method of EventSubscription here
|
||
|
|
* but deliberately not calling `super.remove()` as the responsibility
|
||
|
|
* for removing the subscription lies with the EventEmitter.
|
||
|
|
*/
|
||
|
|
remove() {
|
||
|
|
this.emitter.removeSubscription(this);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = EmitterSubscription;
|