public Observable<PluginInfo> loadPlugin(@NonNull final String pluginName) {
    return fetchPluginInfo(pluginName).flatMap(
        new Function<PluginInfo, ObservableSource<HomePluginConfigInfo>>() {
          @Override public ObservableSource<HomePluginConfigInfo> apply(PluginInfo info) {
            return info == null ? getDownloadPluginInfo(pluginName)
                : getUpdatePluginInfo(pluginName, info);
          }
        }).flatMap(new Function<HomePluginConfigInfo, ObservableSource<File>>() {
      @Override public ObservableSource<File> apply(HomePluginConfigInfo homePluginConfigInfo) {
        //下载插件
        return downloadPlugin(homePluginConfigInfo.mPluginUrl, homePluginConfigInfo.mLocalPath);
      }
    }).observeOn(Schedulers.io()).flatMap(new Function<File, ObservableSource<PluginInfo>>() {
      @Override public ObservableSource<PluginInfo> apply(File file) {
        //插件的安装
        return installPlugin(file.getAbsolutePath());
      }
    }).doOnNext(new Consumer<PluginInfo>() {
      @Override public void accept(PluginInfo pluginInfo) {
        //插件预加载
        if (pluginInfo != null) preLoadPlugin(pluginInfo);
      }
    });
  }