63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule EmitterSubscription
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* @noflow
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* @typechecks
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*/
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'use strict';
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const EventSubscription = require('EventSubscription');
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import type EventEmitter from 'EventEmitter';
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import type EventSubscriptionVendor from 'EventSubscriptionVendor';
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/**
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* EmitterSubscription represents a subscription with listener and context data.
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*/
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class EmitterSubscription extends EventSubscription {
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emitter: EventEmitter;
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listener: Function;
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context: ?Object;
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/**
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* @param {EventEmitter} emitter - The event emitter that registered this
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* subscription
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* @param {EventSubscriptionVendor} subscriber - The subscriber that controls
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* this subscription
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* @param {function} listener - Function to invoke when the specified event is
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* emitted
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* @param {*} context - Optional context object to use when invoking the
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* listener
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*/
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constructor(
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emitter: EventEmitter,
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subscriber: EventSubscriptionVendor,
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listener: Function,
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context: ?Object
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) {
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super(subscriber);
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this.emitter = emitter;
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this.listener = listener;
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this.context = context;
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}
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/**
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* Removes this subscription from the emitter that registered it.
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* Note: we're overriding the `remove()` method of EventSubscription here
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* but deliberately not calling `super.remove()` as the responsibility
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* for removing the subscription lies with the EventEmitter.
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*/
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remove() {
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this.emitter.removeSubscription(this);
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}
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}
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module.exports = EmitterSubscription;
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