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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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