last request timestamp is available in session data

frontend-js/src/main/js/ConfigurationType.js

@@ -15,6 +15,7 @@ var ConfigurationType = {
   REQUEST_ACCOUNT_EMAIL: "REQUEST_ACCOUNT_EMAIL",
   REQUEST_ACCOUNT_DEFAULT_CONTENT: "REQUEST_ACCOUNT_DEFAULT_CONTENT",
   SIMPLE_COLOR_VAL: "SIMPLE_COLOR_VAL",
+  SESSION_LENGTH: "SESSION_LENGTH",
   SHOW_ELEMENT_ABBREVIATION: "SHOW_ELEMENT_ABBREVIATION",
   SHOW_ELEMENT_ANNOTATIONS: "SHOW_ELEMENT_ANNOTATIONS",
   SHOW_ELEMENT_CHARGE: "SHOW_ELEMENT_CHARGE",

frontend-js/src/main/js/SessionData.js

@@ -15,12 +15,33 @@ var logger = require('./logger');
  * @constructor
  */
 function SessionData(project) {
+  var self = this;
   if (project === undefined) {
     throw new Error("Project must be passed as an argument");
   }
-  this.setProject(project);
+  self.setProject(project);
+
+  ServerConnector.addListener("onDataLoadStart", function () {
+    self.setLastRequestTimeStamp(Math.floor(Date.now() / 1000));
+  });
 }
 
+/**
+ *
+ * @param {number} timestamp time stamp in seconds
+ */
+SessionData.prototype.setLastRequestTimeStamp = function (timestamp) {
+  this._lastRequestTimeStamp = timestamp;
+};
+
+/**
+ *
+ * @returns {number} time stamp in seconds
+ */
+SessionData.prototype.getLastRequestTimeStamp = function () {
+  return this._lastRequestTimeStamp;
+};
+
 /**
  *
  * @param {Project} project