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href="function/index.html#static-function-onlyOnce">onlyOnce</a></span></span></li> -<li data-ice="doc"><span data-ice="kind" class="kind-function">F</span><span data-ice="name"><span><a href="function/index.html#static-function-queue">queue</a></span></span></li> -<li data-ice="doc"><span data-ice="kind" class="kind-function">F</span><span data-ice="name"><span><a href="function/index.html#static-function-reject">reject</a></span></span></li> -<li data-ice="doc"><span data-ice="kind" class="kind-function">F</span><span data-ice="name"><span><a href="function/index.html#static-function-fallback">fallback</a></span></span></li> -<li data-ice="doc"><span data-ice="kind" class="kind-function">F</span><span data-ice="name"><span><a href="function/index.html#static-function-wrap">wrap</a></span></span></li> -<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-hasNextTick">hasNextTick</a></span></span></li> -<li data-ice="doc"><span data-ice="kind" class="kind-variable">V</span><span data-ice="name"><span><a href="variable/index.html#static-variable-hasSetImmediate">hasSetImmediate</a></span></span></li> -</ul> -</div> -</nav> - -<div class="content" data-ice="content"><h1 data-ice="title">lib/internal/queue.js</h1> -<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import arrayEach from 'lodash/_arrayEach'; -import arrayMap from 'lodash/_arrayMap'; -import isArray from 'lodash/isArray'; -import noop from 'lodash/noop'; -import property from 'lodash/_baseProperty'; - -import onlyOnce from './onlyOnce'; -import setImmediate from './setImmediate'; - -export default function queue(worker, concurrency, payload) { - if (concurrency == null) { - concurrency = 1; - } - else if(concurrency === 0) { - throw new Error('Concurrency must not be zero'); - } - function _insert(q, data, pos, callback) { - if (callback != null && typeof callback !== 'function') { - throw new Error('task callback must be a function'); - } - q.started = true; - if (!isArray(data)) { - data = [data]; - } - if(data.length === 0 && q.idle()) { - // call drain immediately if there are no tasks - return setImmediate(function() { - q.drain(); - }); - } - arrayEach(data, function(task) { - var item = { - data: task, - callback: callback || noop - }; - - if (pos) { - q.tasks.unshift(item); - } else { - q.tasks.push(item); - } - - }); - setImmediate(q.process); - } - function _next(q, tasks) { - return function(){ - workers -= 1; - - - var removed = false; - var args = arguments; - arrayEach(tasks, function (task) { - arrayEach(workersList, function (worker, index) { - if (worker === task && !removed) { - workersList.splice(index, 1); - removed = true; - } - }); - - task.callback.apply(task, args); - - if (args[0] != null) { - q.error(args[0], task.data); - } - }); - - if (workers <= (q.concurrency - q.buffer) ) { - q.unsaturated(); - } - - if (q.tasks.length + workers === 0) { - q.drain(); - } - q.process(); - }; - } - - var workers = 0; - var workersList = []; - var q = { - tasks: [], - concurrency: concurrency, - payload: payload, - saturated: noop, - unsaturated:noop, - buffer: concurrency / 4, - empty: noop, - drain: noop, - error: noop, - started: false, - paused: false, - push: function (data, callback) { - _insert(q, data, false, callback); - }, - kill: function () { - q.drain = noop; - q.tasks = []; - }, - unshift: function (data, callback) { - _insert(q, data, true, callback); - }, - process: function () { - while(!q.paused && workers < q.concurrency && q.tasks.length){ - - var tasks = q.payload ? - q.tasks.splice(0, q.payload) : - q.tasks.splice(0, q.tasks.length); - - var data = arrayMap(tasks, property('data')); - - if (q.tasks.length === 0) { - q.empty(); - } - workers += 1; - workersList.push(tasks[0]); - - if (workers === q.concurrency) { - q.saturated(); - } - - var cb = onlyOnce(_next(q, tasks)); - worker(data, cb); - - - } - }, - length: function () { - return q.tasks.length; - }, - running: function () { - return workers; - }, - workersList: function () { - return workersList; - }, - idle: function() { - return q.tasks.length + workers === 0; - }, - pause: function () { - q.paused = true; - }, - resume: function () { - if (q.paused === false) { return; } - q.paused = false; - var resumeCount = Math.min(q.concurrency, q.tasks.length); - // Need to call q.process once per concurrent - // worker to preserve full concurrency after pause - for (var w = 1; w <= resumeCount; w++) { - setImmediate(q.process); - } - } - }; - return q; -} -</code></pre> - -</div> - -<footer class="footer"> - Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.7)</span></a> -</footer> - -<script src="script/search_index.js"></script> -<script src="script/search.js"></script> -<script 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