viewpoint/dist/http/http-request-pool.js

the exchange email API for nodejs module

var HttpRequest, HttpRequestPool, Q;

Q = require('q');

HttpRequest = require('http-ext').HttpRequest;

module.exports = HttpRequestPool = (function() {
  var request;

  function HttpRequestPool(maxSize) {
    this.maxSize = maxSize != null ? maxSize : 10;
    this.activeSize = 0;
    this.waitQueue = [];
    this.inProcessQueue = new Set;
  }

  HttpRequestPool.prototype.getActiveSize = function() {
    return this.activeSize;
  };

  HttpRequestPool.prototype.schedule = function() {
    var results, task;
    results = [];
    while (this.waitQueue.length > 0 && this.activeSize < this.maxSize) {
      task = this.waitQueue.pop();
      results.push(task());
    }
    return results;
  };

  HttpRequestPool.prototype.close = function() {
    var client, i, len, ref, results;
    this.waitQueue = [];
    ref = this.inProcessQueue;
    results = [];
    for (i = 0, len = ref.length; i < len; i++) {
      client = ref[i];
      results.push(client.abort());
    }
    return results;
  };

  HttpRequestPool.prototype.newRequest = function(options, defer) {
    var client;
    ++this.activeSize;
    client = new HttpRequest(options, (function(_this) {
      return function(err, res) {
        if (err) {
          defer.reject(err);
        } else {
          defer.resolve(res);
        }
        _this.inProcessQueue["delete"](client);
        --_this.activeSize;
        return _this.schedule();
      };
    })(this));
    return this.inProcessQueue.add(client);
  };

  request = function(method, url, options) {
    var callback, defer;
    if (options == null) {
      options = {};
    }
    if (typeof options === 'function') {
      callback = options;
      options = {};
    }
    options.url = url;
    options.method = method;
    defer = Q.defer();
    if (this.activeSize + 1 > this.maxSize) {
      this.waitQueue.push(this.newRequest.bind(this, options, defer));
    } else {
      this.newRequest(options, defer);
    }
    return defer.promise;
  };

  HttpRequestPool.prototype.get = function(url, options) {
    return request.call(this, 'GET', url, options);
  };

  HttpRequestPool.prototype.post = function(url, options) {
    return request.call(this, 'POST', url, options);
  };

  return HttpRequestPool;

})();