David Baker
845c796b96
The previous impl bluntly created a closure for every event type and source emitter we set up a re-emit for. We can do much better than this fairly easily by having one bound handler for each event name and moving it into a class so we have one emitter per target, since 99% of the time the target is the client object.
47 lines
1.3 KiB
JavaScript
47 lines
1.3 KiB
JavaScript
/*
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Copyright 2015, 2016 OpenMarket Ltd
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Copyright 2017 Vector Creations Ltd
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Copyright 2017 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @module
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*/
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export default class Reemitter {
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constructor(target) {
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this.target = target;
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// We keep one bound event handler for each event name so we know
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// what event is arriving
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this.boundHandlers = {};
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}
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_handleEvent(eventName, ...args) {
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this.target.emit(eventName, ...args);
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}
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reEmit(source, eventNames) {
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for (const eventName of eventNames) {
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if (this.boundHandlers[eventName] === undefined) {
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this.boundHandlers[eventName] = this._handleEvent.bind(this, eventName);
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}
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const boundHandler = this.boundHandlers[eventName];
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source.on(eventName, boundHandler);
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}
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}
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}
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