mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 10:28:55 +01:00
109 lines
2.1 KiB
JavaScript
109 lines
2.1 KiB
JavaScript
/*
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// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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*/
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'use strict';
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/**************************************
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*
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*/
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mc.task = class
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{
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constructor(generator, opts = {})
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{
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Object.defaults(opts,
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{
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interval: 0, // The attempt cadence.
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skips: false, // skips cycles when there is no idle time
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fills: true, // invokes generator until idle slice has diminished.
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});
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this.opts = opts;
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this.generator = generator;
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this.rid = null; // request id
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this.cycle = 0; // number of task handler invocations
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this.skips = 0; // number of skipped cycles due to no idle time
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this.generation = 0; // number of generator next invocations
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// Note the initial execution of the generator
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// does NOT take place on an idle slice.
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this.generated = generator();
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this.generation++;
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// Init task cycle
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this.request();
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}
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request()
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{
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if(this.requested())
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this.cancel();
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let handler = (deadline) =>
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{
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this.rid = null;
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this.handler(deadline);
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this.cycle++;
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};
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let opts =
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{
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timeout: this.opts.interval,
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};
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this.rid = window.requestIdleCallback(handler, opts);
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}
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handler(deadline)
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{
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let remain = () => deadline.timeRemaining();
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let timeout = deadline.didTimeout;
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if(timeout && this.opts.skips)
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{
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this.skips++;
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this.request();
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return;
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}
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if(this.generate(remain))
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this.request();
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}
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generate(remain)
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{
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let result; do
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{
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result = this.generated.next();
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this.generation++;
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}
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while(!result.done && remain() > 0)
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return result.done;
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}
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cancel()
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{
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if(!this.requested())
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return false;
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window.cancelIdleCallback(this.rid);
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this.rid = null;
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return true;
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}
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requested()
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{
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return this.rid !== undefined && this.rid !== null;
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}
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};
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