UNPKG

limit-concurrency-decorator

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610 lines (596 loc) 24.7 kB
<!doctype html> <html lang="en"> <head> <title>Code coverage report for index.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1><a href="index.html">All files</a> index.js</h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">88.35% </span> <span class="quiet">Statements</span> <span class='fraction'>91/103</span> </div> <div class='fl pad1y space-right2'> <span class="strong">81.25% </span> <span class="quiet">Branches</span> <span class='fraction'>39/48</span> </div> <div class='fl pad1y space-right2'> <span class="strong">80.95% </span> <span class="quiet">Functions</span> <span class='fraction'>17/21</span> </div> <div class='fl pad1y space-right2'> <span class="strong">89% </span> <span class="quiet">Lines</span> <span class='fraction'>89/100</span> </div> </div> <p class="quiet"> Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block. </p> </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a> <a name='L2'></a><a href='#L2'>2</a> <a name='L3'></a><a href='#L3'>3</a> <a name='L4'></a><a href='#L4'>4</a> <a name='L5'></a><a href='#L5'>5</a> <a name='L6'></a><a href='#L6'>6</a> <a name='L7'></a><a href='#L7'>7</a> <a name='L8'></a><a href='#L8'>8</a> <a name='L9'></a><a href='#L9'>9</a> <a name='L10'></a><a href='#L10'>10</a> <a name='L11'></a><a href='#L11'>11</a> <a name='L12'></a><a href='#L12'>12</a> <a name='L13'></a><a href='#L13'>13</a> <a name='L14'></a><a href='#L14'>14</a> <a name='L15'></a><a href='#L15'>15</a> <a name='L16'></a><a 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class="cline-any cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-yes">3x</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">function Deferred(fn, thisArg, args, resolve, reject) { this.args = args; this.fn = fn; this.reject = reject; this.resolve = resolve; this.thisArg = thisArg; } &nbsp; function next() { const d = this.pop(); if (d === undefined) { ++this.concurrency; } else { try { d.resolve(d.fn.apply(d.thisArg, d.args)); } catch (error) { <span class="cstat-no" title="statement not covered" > d.reject(error);</span> } } } &nbsp; // based on implementation in https://github.com/ForbesLindesay/throat function Queue(concurrency) { // not related to the queue implementation but used in this lib this.concurrency = concurrency; this.next = next.bind(this); &nbsp; this._s1 = []; // stack to push to this._s2 = []; // stack to pop from } &nbsp; Queue.prototype.push = function(value) { this._s1.push(value); }; &nbsp; Queue.prototype.pop = function() { let s2 = this._s2; <span class="missing-if-branch" title="else path not taken" >E</span>if (s2.length === 0) { const s1 = this._s1; if (s1.length === 0) { return; } this._s1 = s2; s2 = this._s2 = s1.reverse(); } return s2.pop(); }; &nbsp; const getSymbol = typeof Symbol === "function" ? key =&gt; Symbol.for("limit-concurrency-decorator/" + key) : <span class="fstat-no" title="function not covered" ><span class="branch-1 cbranch-no" title="branch not covered" >ke</span>y =&gt; <span class="cstat-no" title="statement not covered" >"@@limit-concurrency-decorator/" + key;</span></span> &nbsp; export const FAIL_ON_QUEUE = getSymbol("FAIL_ON_QUEUE"); export const BYPASS_QUEUE = getSymbol("BYPASS_QUEUE"); &nbsp; const defaultTermination = promise =&gt; promise; &nbsp; const { slice } = Array.prototype; &nbsp; function <span class="fstat-no" title="function not covered" >callWrapper(</span>fn) { <span class="cstat-no" title="statement not covered" > if (typeof fn !== "function") {</span> <span class="cstat-no" title="statement not covered" > fn = this[fn];</span> } &nbsp; <span class="cstat-no" title="statement not covered" > return fn.apply(this, slice.call(arguments, 1));</span> } &nbsp; const makeLimiter = (getQueue, termination = defaultTermination) =&gt; { return (fn = <span class="branch-0 cbranch-no" title="branch not covered" >callWrapper)</span> =&gt; function() { const queue = getQueue(this); let canRun = queue.concurrency &gt; 0; let argStart = 0; const { length } = arguments; if (argStart &lt; length) { const maybeFlag = arguments[argStart++]; if (maybeFlag === BYPASS_QUEUE) { canRun = true; } else if (maybeFlag === FAIL_ON_QUEUE) { if (!canRun) { return Promise.reject(new Error("no available place in queue")); } } else { --argStart; } } const args = slice.call(arguments, argStart); let promise; if (canRun) { --queue.concurrency; try { promise = fn.apply(this, args); if (promise == null || typeof promise.then !== "function") { promise = Promise.resolve(promise); } } catch (error) { promise = Promise.reject(error); } } else { promise = new Promise((resolve, reject) =&gt; queue.push(new Deferred(fn, this, args, resolve, reject)) ); } const { next } = queue; termination(promise).then(next, next); return promise; }; }; &nbsp; const identity = <span class="fstat-no" title="function not covered" >fn</span> =&gt; <span class="cstat-no" title="statement not covered" >fn;</span> &nbsp; // create a function limiter where the concurrency is shared between // all functions const limitFunction = (concurrency, opts) =&gt; { <span class="missing-if-branch" title="if path not taken" >I</span>if (concurrency === 0 || concurrency === Infinity) { <span class="cstat-no" title="statement not covered" > return identity;</span> } &nbsp; const queue = new Queue(concurrency); return makeLimiter(() =&gt; queue, opts); }; &nbsp; // create a method limiter where the concurrency is shared between all // methods but locally to the instance export const limitMethod = (concurrency, opts) =&gt; { <span class="missing-if-branch" title="if path not taken" >I</span>if (concurrency === 0 || concurrency === Infinity) { <span class="cstat-no" title="statement not covered" > return identity;</span> } &nbsp; const queues = new WeakMap(); return makeLimiter(obj =&gt; { let queue = queues.get(obj); if (queue === undefined) { queue = new Queue(concurrency); queues.set(obj, queue); } return queue; }, opts); }; &nbsp; export const limitConcurrency = (...args) =&gt; { let method = false; let wrap; return (target, key, descriptor) =&gt; { if (key === undefined) { if (wrap === undefined) { wrap = limitFunction(...args); } else <span class="missing-if-branch" title="if path not taken" >I</span>if (method) { <span class="cstat-no" title="statement not covered" > throw new Error(</span> "the same decorator cannot be used between function and method" ); } return wrap(target); } &nbsp; if (wrap === undefined) { method = true; wrap = limitMethod(...args); } else if (!method) { throw new Error( "the same decorator cannot be used between function and method" ); } &nbsp; <span class="missing-if-branch" title="else path not taken" >E</span>if ("value" in descriptor) { descriptor.value = wrap(descriptor.value); } else { const { get } = <span class="cstat-no" title="statement not covered" >descriptor;</span> <span class="cstat-no" title="statement not covered" > descriptor.get = <span class="fstat-no" title="function not covered" >fu</span>nction() {</span> <span class="cstat-no" title="statement not covered" > return wrap(get.call(this));</span> }; } &nbsp; return descriptor; }; }; &nbsp;</pre></td></tr></table></pre> <div class='push'></div><!-- for sticky footer --> 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