Implemented renderJson for EnvironmentPage

Author: sarutak

core/src/main/scala/org/apache/spark/ui/env/EnvironmentPage.scala

@@ -19,13 +19,29 @@ package org.apache.spark.ui.env
 
 import javax.servlet.http.HttpServletRequest
 
+import org.json4s.{JObject, JValue}
+import org.json4s.JsonDSL._
+
 import scala.xml.Node
 
 import org.apache.spark.ui.{UIUtils, WebUIPage}
 
 private[ui] class EnvironmentPage(parent: EnvironmentTab) extends WebUIPage("") {
   private val listener = parent.listener
 
+  override def renderJson(request: HttpServletRequest): JValue = {
+    val jvmInfoJson = ("RUntime Informationf" -> listener.jvmInformation.foldLeft(JObject())(_ ~ _))
+    val sparkPropertiesJson = ("Spark Properties" -> listener.sparkProperties.foldLeft(JObject())(_ ~ _))
+    val systemPropertiesJson = ("System Properties" -> listener.systemProperties.foldLeft(JObject())(_ ~ _))
+    val classPathEntriesJson = ("Classpath Entries" -> listener.classpathEntries.foldLeft(JObject())(_ ~ _))
+
+    val environment = ("Environment" -> jvmInfoJson ~
+                                        sparkPropertiesJson ~
+                                        systemPropertiesJson ~
+                                        classPathEntriesJson)
+    environment
+  }
+
   def render(request: HttpServletRequest): Seq[Node] = {
     val runtimeInformationTable = UIUtils.listingTable(
       propertyHeader, jvmRow, listener.jvmInformation, fixedWidth = true)