code: private void firePluginStopped(final Plugin plugin) {
          PluginEvent e = null;
          synchronized (listenerList) {
              for (Iterator iter = listenerList.iterator(); iter.hasNext();) {
                  PluginListener l = (PluginListener) iter.next();
                  if (e == null) {
                      e = new PluginEvent(plugin);
                  }
                  l.pluginStopped(e);
              }
          }
      }
docs: Calls the pluginStopped method for every registered PluginListner.
  
  @param plugin The plugin that has been stopped.