'use strict';
|
|
Object.defineProperty(exports, "__esModule", {
|
value: true
|
});
|
exports.default = queue;
|
|
var _baseIndexOf = require('lodash/_baseIndexOf');
|
|
var _baseIndexOf2 = _interopRequireDefault(_baseIndexOf);
|
|
var _isArray = require('lodash/isArray');
|
|
var _isArray2 = _interopRequireDefault(_isArray);
|
|
var _noop = require('lodash/noop');
|
|
var _noop2 = _interopRequireDefault(_noop);
|
|
var _onlyOnce = require('./onlyOnce');
|
|
var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
|
|
var _setImmediate = require('./setImmediate');
|
|
var _setImmediate2 = _interopRequireDefault(_setImmediate);
|
|
var _DoublyLinkedList = require('./DoublyLinkedList');
|
|
var _DoublyLinkedList2 = _interopRequireDefault(_DoublyLinkedList);
|
|
var _wrapAsync = require('./wrapAsync');
|
|
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
function queue(worker, concurrency, payload) {
|
if (concurrency == null) {
|
concurrency = 1;
|
} else if (concurrency === 0) {
|
throw new Error('Concurrency must not be zero');
|
}
|
|
var _worker = (0, _wrapAsync2.default)(worker);
|
var numRunning = 0;
|
var workersList = [];
|
|
var processingScheduled = false;
|
function _insert(data, insertAtFront, callback) {
|
if (callback != null && typeof callback !== 'function') {
|
throw new Error('task callback must be a function');
|
}
|
q.started = true;
|
if (!(0, _isArray2.default)(data)) {
|
data = [data];
|
}
|
if (data.length === 0 && q.idle()) {
|
// call drain immediately if there are no tasks
|
return (0, _setImmediate2.default)(function () {
|
q.drain();
|
});
|
}
|
|
for (var i = 0, l = data.length; i < l; i++) {
|
var item = {
|
data: data[i],
|
callback: callback || _noop2.default
|
};
|
|
if (insertAtFront) {
|
q._tasks.unshift(item);
|
} else {
|
q._tasks.push(item);
|
}
|
}
|
|
if (!processingScheduled) {
|
processingScheduled = true;
|
(0, _setImmediate2.default)(function () {
|
processingScheduled = false;
|
q.process();
|
});
|
}
|
}
|
|
function _next(tasks) {
|
return function (err) {
|
numRunning -= 1;
|
|
for (var i = 0, l = tasks.length; i < l; i++) {
|
var task = tasks[i];
|
|
var index = (0, _baseIndexOf2.default)(workersList, task, 0);
|
if (index === 0) {
|
workersList.shift();
|
} else if (index > 0) {
|
workersList.splice(index, 1);
|
}
|
|
task.callback.apply(task, arguments);
|
|
if (err != null) {
|
q.error(err, task.data);
|
}
|
}
|
|
if (numRunning <= q.concurrency - q.buffer) {
|
q.unsaturated();
|
}
|
|
if (q.idle()) {
|
q.drain();
|
}
|
q.process();
|
};
|
}
|
|
var isProcessing = false;
|
var q = {
|
_tasks: new _DoublyLinkedList2.default(),
|
concurrency: concurrency,
|
payload: payload,
|
saturated: _noop2.default,
|
unsaturated: _noop2.default,
|
buffer: concurrency / 4,
|
empty: _noop2.default,
|
drain: _noop2.default,
|
error: _noop2.default,
|
started: false,
|
paused: false,
|
push: function (data, callback) {
|
_insert(data, false, callback);
|
},
|
kill: function () {
|
q.drain = _noop2.default;
|
q._tasks.empty();
|
},
|
unshift: function (data, callback) {
|
_insert(data, true, callback);
|
},
|
remove: function (testFn) {
|
q._tasks.remove(testFn);
|
},
|
process: function () {
|
// Avoid trying to start too many processing operations. This can occur
|
// when callbacks resolve synchronously (#1267).
|
if (isProcessing) {
|
return;
|
}
|
isProcessing = true;
|
while (!q.paused && numRunning < q.concurrency && q._tasks.length) {
|
var tasks = [],
|
data = [];
|
var l = q._tasks.length;
|
if (q.payload) l = Math.min(l, q.payload);
|
for (var i = 0; i < l; i++) {
|
var node = q._tasks.shift();
|
tasks.push(node);
|
workersList.push(node);
|
data.push(node.data);
|
}
|
|
numRunning += 1;
|
|
if (q._tasks.length === 0) {
|
q.empty();
|
}
|
|
if (numRunning === q.concurrency) {
|
q.saturated();
|
}
|
|
var cb = (0, _onlyOnce2.default)(_next(tasks));
|
_worker(data, cb);
|
}
|
isProcessing = false;
|
},
|
length: function () {
|
return q._tasks.length;
|
},
|
running: function () {
|
return numRunning;
|
},
|
workersList: function () {
|
return workersList;
|
},
|
idle: function () {
|
return q._tasks.length + numRunning === 0;
|
},
|
pause: function () {
|
q.paused = true;
|
},
|
resume: function () {
|
if (q.paused === false) {
|
return;
|
}
|
q.paused = false;
|
(0, _setImmediate2.default)(q.process);
|
}
|
};
|
return q;
|
}
|
module.exports = exports['default'];
|
