code: function PoolNamespace(cluster, pattern, selector) {
    this._cluster = cluster;
    this._pattern = pattern;
    this._selector = new PoolSelector[selector]();
  }
docs: PoolNamespace
  @constructor
  @param {PoolCluster} cluster The parent cluster for the namespace
  @param {string} pattern The selection pattern to use
  @param {string} selector The selector name to use
  @public