50 lines
1.9 KiB
JavaScript
50 lines
1.9 KiB
JavaScript
/*
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Copyright 2015, 2016 OpenMarket 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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'use strict';
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const flux = require("flux");
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class MatrixDispatcher extends flux.Dispatcher {
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/**
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* @param {Object} payload Required. The payload to dispatch.
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* Must contain at least an 'action' key.
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* @param {boolean=} sync Optional. Pass true to dispatch
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* synchronously. This is useful for anything triggering
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* an operation that the browser requires user interaction
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* for.
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*/
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dispatch(payload, sync) {
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if (sync) {
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super.dispatch(payload);
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} else {
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// Unless the caller explicitly asked for us to dispatch synchronously,
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// we always set a timeout to do this: The flux dispatcher complains
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// if you dispatch from within a dispatch, so rather than action
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// handlers having to worry about not calling anything that might
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// then dispatch, we just do dispatches asynchronously.
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setTimeout(super.dispatch.bind(this, payload), 0);
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}
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}
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}
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// XXX this is a big anti-pattern, and makes testing hard. Because dispatches
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// happen asynchronously, it is possible for actions dispatched in one thread
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// to arrive in another, with *hilarious* consequences.
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if (global.mxDispatcher === undefined) {
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global.mxDispatcher = new MatrixDispatcher();
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}
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module.exports = global.mxDispatcher;
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