a simple pool library for nodejs.

gistfile1.js

var Pool = function (poolSize, taskHandler) {
  this.poolSize = poolSize;
  this.taskHandler = taskHandler;
  this.free = poolSize;
  this.offlineTasks = [];

};

Pool.prototype.check = function () {
  if (this.offlineTasks.length > 0 && this.free > 0) {
    var task = this.offlineTasks.shift();
    var data = task[0];
    var callback = task[1];

    this.free += 1;
    this.taskHandler(data, function (err, result) {
      this.free -= 1;
      this.check();
      if (typeof callback === 'function') {
        callback(err, result);
      }
    });
  }
};

Pool.prototype.push = function (data, callback) {
  this.offlineTasks.push([data, callback]);
  this.check();
  return this;
};