/usr/lib/nodejs/batch/index.js is in node-batch 0.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | /**
* Module dependencies.
*/
try {
var EventEmitter = require('events').EventEmitter;
} catch (err) {
var Emitter = require('emitter');
}
/**
* Noop.
*/
function noop(){}
/**
* Expose `Batch`.
*/
module.exports = Batch;
/**
* Create a new Batch.
*/
function Batch() {
if (!(this instanceof Batch)) return new Batch;
this.fns = [];
this.concurrency(Infinity);
this.throws(true);
for (var i = 0, len = arguments.length; i < len; ++i) {
this.push(arguments[i]);
}
}
/**
* Inherit from `EventEmitter.prototype`.
*/
if (EventEmitter) {
Batch.prototype.__proto__ = EventEmitter.prototype;
} else {
Emitter(Batch.prototype);
}
/**
* Set concurrency to `n`.
*
* @param {Number} n
* @return {Batch}
* @api public
*/
Batch.prototype.concurrency = function(n){
this.n = n;
return this;
};
/**
* Queue a function.
*
* @param {Function} fn
* @return {Batch}
* @api public
*/
Batch.prototype.push = function(fn){
this.fns.push(fn);
return this;
};
/**
* Set wether Batch will or will not throw up.
*
* @param {Boolean} throws
* @return {Batch}
* @api public
*/
Batch.prototype.throws = function(throws) {
this.e = !!throws;
return this;
};
/**
* Execute all queued functions in parallel,
* executing `cb(err, results)`.
*
* @param {Function} cb
* @return {Batch}
* @api public
*/
Batch.prototype.end = function(cb){
var self = this
, total = this.fns.length
, pending = total
, results = []
, errors = []
, cb = cb || noop
, fns = this.fns
, max = this.n
, throws = this.e
, index = 0
, done;
// empty
if (!fns.length) return cb(null, results);
// process
function next() {
var i = index++;
var fn = fns[i];
if (!fn) return;
var start = new Date;
try {
fn(callback);
} catch (err) {
callback(err);
}
function callback(err, res){
if (done) return;
if (err && throws) return done = true, cb(err);
var complete = total - pending + 1;
var end = new Date;
results[i] = res;
errors[i] = err;
self.emit('progress', {
index: i,
value: res,
error: err,
pending: pending,
total: total,
complete: complete,
percent: complete / total * 100 | 0,
start: start,
end: end,
duration: end - start
});
if (--pending) next();
else if(!throws) cb(errors, results);
else cb(null, results);
}
}
// concurrency
for (var i = 0; i < fns.length; i++) {
if (i == max) break;
next();
}
return this;
};
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