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// Initialize the Spark UI<strong>private</strong>[spark] <strong>val </strong>ui: Option[SparkUI] =  <strong>if </strong>(conf.getBoolean("spark.ui.enabled", <strong>true</strong>)) {    Some(SparkUI.createLiveUI(<strong>this</strong>, conf, listenerBus, jobProgressListener,      env.securityManager,appName))  } <strong>else </strong>{    // For tests, do not enable the UI    None  }// Bind the UI before starting the task scheduler to communicate// the bound port to the cluster manager properlyui.foreach(_.bind())

<strong>def </strong>createLiveUI(    sc: SparkContext,    conf: SparkConf,    listenerBus: SparkListenerBus,    jobProgressListener: JobProgressListener,    securityManager: SecurityManager,    appName: String): SparkUI =  {  create(Some(sc), conf, listenerBus, securityManager, appName,    jobProgressListener = Some(jobProgressListener))}