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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = function (worker, concurrency) {
function _compareTasks(a, b) {
return a.priority - b.priority;
}
function _binarySearch(sequence, item, compare) {
var beg = -1,
end = sequence.length - 1;
while (beg < end) {
var mid = beg + (end - beg + 1 >>> 1);
if (compare(item, sequence[mid]) >= 0) {
beg = mid;
} else {
end = mid - 1;
}
}
return beg;
}
function _insert(q, data, priority, 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) {
// call drain immediately if there are no tasks
return (0, _setImmediate2.default)(function () {
q.drain();
});
}
(0, _arrayEach2.default)(data, function (task) {
var item = {
data: task,
priority: priority,
callback: typeof callback === 'function' ? callback : _noop2.default
};
q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
if (q.tasks.length === q.concurrency) {
q.saturated();
}
(0, _setImmediate2.default)(q.process);
});
}
// Start with a normal queue
var q = (0, _queue2.default)(worker, concurrency);
// Override push to accept second parameter representing priority
q.push = function (data, priority, callback) {
_insert(q, data, priority, callback);
};
// Remove unshift function
delete q.unshift;
return q;
};
var _arrayEach = require('lodash/_arrayEach');
var _arrayEach2 = _interopRequireDefault(_arrayEach);
var _isArray = require('lodash/isArray');
var _isArray2 = _interopRequireDefault(_isArray);
var _noop = require('lodash/noop');
var _noop2 = _interopRequireDefault(_noop);
var _setImmediate = require('./setImmediate');
var _setImmediate2 = _interopRequireDefault(_setImmediate);
var _queue = require('./queue');
var _queue2 = _interopRequireDefault(_queue);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
module.exports = exports['default'];
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