31   protected $active = null;  variable in Swift_Connection_Multi
65     if ($this->active === null)
69     return $this->connections[$this->active]->read();
78     if ($this->active === null)
82     return $this->connections[$this->active]->write($command, $end);
98           $this->active = $id;
122     if ($this->active !== null) $this->connections[$this->active]->stop();
123     $this->active = null;
131     return (($this->active !== null) && $this->connections[$this->active]->isAlive());
138     $this->connections[$this->active]->postConnect($instance);
145     $this->connections[$this->active]->setExtension($extension, $attributes);
152     return $this->connections[$this->active]->hasExtension($name);
159     return $this->connections[$this->active]->getAttributes($name);