ajithme commented on a change in pull request #24088: [SPARK-27122][core] Jetty 
classes must not be return via getters in org.apache.spark.ui.WebUI
URL: https://github.com/apache/spark/pull/24088#discussion_r265820927
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/ui/WebUI.scala
 ##########
 @@ -193,3 +209,30 @@ private[spark] abstract class WebUIPage(var prefix: 
String) {
   def render(request: HttpServletRequest): Seq[Node]
   def renderJson(request: HttpServletRequest): JValue = JNothing
 }
+
+private[spark] class DelegatingServletContextHandler(servletContextHandler: 
ServletContextHandler) {
+
+  def prependFilterMapping(filterName: String,
+                           spec: String,
+                           types: EnumSet[DispatcherType]): Unit = {
+    val mapping = new FilterMapping()
+    mapping.setFilterName(filterName)
+    mapping.setPathSpec(spec)
+    mapping.setDispatcherTypes(EnumSet.allOf(classOf[DispatcherType]))
+    servletContextHandler.getServletHandler.prependFilterMapping(mapping)
+  }
+
+  def addFilter(filterName: String,
+                className: String,
+                filterParams: Map[String, String]): Unit = {
+    val filterHolder = new FilterHolder()
+    filterHolder.setName(filterName)
+    filterHolder.setClassName(className)
+    filterParams.foreach { case (k, v) => filterHolder.setInitParameter(k, v) }
+    servletContextHandler.getServletHandler.addFilter(filterHolder)
+  }
+
+  def filterSize(): Int = {
 
 Review comment:
   Done

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