# Code coverage report for queue/index.js

## Statements: 98.8% (82 / 83) Branches: 97.5% (39 / 40) Functions: 100% (13 / 13) Lines: 98.77% (80 / 81) Ignored: none

All files » queue/ » index.js

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     var inherits = require('inherits');
    var EventEmitter = require('events').EventEmitter;

    module.exports = Queue;

    function Queue(options) {
      if (!(this instanceof Queue))
        return new Queue(options);

      EventEmitter.call(this);
      options = options || {};
      this.concurrency = options.concurrency || Infinity;
      this.timeout = options.timeout || 0;
      this.pending = 0;
      this.session = 0;
      this.running = false;
      this.jobs = [];
    }
    inherits(Queue, EventEmitter);

    var arrayMethods = [
      'push',
      'unshift',
      'splice',
      'pop',
      'shift',
      'slice',
      'reverse',
      'indexOf',
      'lastIndexOf'
    ];

    for (var method in arrayMethods) (function(method) {
      Queue.prototype[method] = function() {
        return Array.prototype[method].apply(this.jobs, arguments);
      };
    })(arrayMethods[method]);

    Object.defineProperty(Queue.prototype, 'length', { get: function() {
      return this.pending + this.jobs.length;
    }});

    Queue.prototype.start = function(cb) {
      if (cb) {
        callOnErrorOrEnd.call(this, cb);
      }

      if (this.pending === this.concurrency) {
        return;
      }

      if (this.jobs.length === 0) {
        Iif (this.pending === 0) {
          done.call(this);
        }
        return;
      }

      var self = this;
      var job = this.jobs.shift();
      var once = true;
      var session = this.session;
      var timeoutId = null;
      var didTimeout = false;

      function next(err, result) {
        if (once && self.session === session) {
          once = false;
          self.pending--;
          if (timeoutId !== null) {
            clearTimeout(timeoutId);
          }

          if (err) {
            self.emit('error', err, job);
          } else if (didTimeout === false) {
            self.emit('success', result, job);
          }

          if (self.session === session) {
            if (self.pending === 0 && self.jobs.length === 0) {
              done.call(self);
            } else if (self.running) {
              self.start();
            }
          }
        }
      }

      if (this.timeout) {
        timeoutId = setTimeout(function() {
          didTimeout = true;
          if (self.listeners('timeout').length > 0) {
            self.emit('timeout', next, job);
          } else {
            next();
          }
        }, this.timeout);
      }

      this.pending++;
      this.running = true;
      job(next);

      if (this.jobs.length > 0) {
        this.start();
      }
    };

    Queue.prototype.stop = function() {
      this.running = false;
    };

    Queue.prototype.end = function(err) {
      this.jobs.length = 0;
      this.pending = 0;
      done.call(this, err);
    };

    function callOnErrorOrEnd(cb) {
      var self = this;
      this.on('error', onerror);
      this.on('end', onend);

      function onerror(err) { self.end(err); }
      function onend(err) {
        self.removeListener('error', onerror);
        self.removeListener('end', onend);
        cb(err);
      }
    }

    function done(err) {
      this.session++;
      this.running = false;
      this.emit('end', err);
    }