read server time from http resposne header

client/src/main/java/de/pellepelster/jenkins/walldisplay/JenkinsWorker.java

@@ -33,7 +33,6 @@ public class JenkinsWorker extends SwingWorker<Hudson, Void> {
     private final static int READ_TIMEOUT = 5000;
     private final static int JOB_API_EXECUTORS = 5;
     private final static int JOB_API_TIMEOUT = CONNECT_TIMEOUT + READ_TIMEOUT + 1000;
-
     private String jenkinsUrl;
     private Exception exception = null;
     private String viewName;
@@ -71,12 +70,26 @@ public void run() {
         }
     }
 
+    private long getServerResponseTime(String jenkinsUrl) {
+
+        try {
+            URL url = new URL(jenkinsUrl);
+            URLConnection conn = url.openConnection();
+
+            return conn.getHeaderFieldDate("Date", 0);
+
+        } catch (Exception e) {
+            return 0;
+        }
+    }
+
     /** {@inheritDoc} */
     @Override
     protected Hudson doInBackground() throws Exception {
         exception = null;
 
         try {
+
             URL hudsonQueueApiUrl = new URL(String.format("%s/queue/api/xml", jenkinsUrl));
 
             XStream queueXstream = getDefaultXStream();
@@ -97,22 +110,22 @@ protected Hudson doInBackground() throws Exception {
             hudsonXstream.addImplicitCollection(View.class, "jobs", "job", Job.class);
 
             Hudson hudson = (Hudson) hudsonXstream.fromXML(openStream(hudsonApiUrl));
-
-
+            hudson.setServerResponseTimestamp(getServerResponseTime(jenkinsUrl));
+            
             List<Job> jobs = hudson.getJobs();
             for (View view : hudson.getViews()) {
                 if (viewName != null && viewName.equals(view.getName())) {
                     jobs = view.getJobs();
                 }
             }
-            
+
             ExecutorService executor = Executors.newFixedThreadPool(JOB_API_EXECUTORS);
 
             //load detailed jobs infos for all displayed jobs
             for (Job job : jobs) {
                 executor.execute(new JobApiRunnable(job));
             }
-            
+
             executor.shutdown();
             executor.awaitTermination(JOB_API_TIMEOUT, TimeUnit.MILLISECONDS);
 

client/src/main/java/de/pellepelster/jenkins/walldisplay/WallDisplayFrame.java

@@ -86,7 +86,8 @@ public int compare(Job job1, Job job2) {
     private final static String MESSAGE_NO_URL_ENTERED = "No URL given, exiting";
     private final static String MESSAGE_JEKINS_WALL_DISPLAY = "Jenkins Wall Display";
     private final static int MAX_QUEUE_POSITIONS = 3;
-
+    private long currentServerTimestamp = 0;
+
     public WallDisplayFrame() {
 
         initFrame();
@@ -307,6 +308,7 @@ public void actionPerformed(ActionEvent event) {
                             message = hudsonWorker.getException().getMessage();
                         } else {
                             jobs.addAll(JenkinsWorker.getJobsToDisplay(hudsonWorker.get(), viewName));
+                            currentServerTimestamp = hudsonWorker.get().getServerResponseTimestamp();
                             Collections.sort(jobs, new JobComperator());
                         }
 
@@ -467,7 +469,7 @@ private void paintProgress(Graphics2D graphics, int jobX, int jobY, int jobWidth
         Area jobRectangleArea =
                 new Area(new RoundRectangle2D.Double(jobX, jobY, jobWidth, jobHeight, JOB_ARC_WIDTH, JOB_ARC_HEIGHT));
 
-        long currentDuration = System.currentTimeMillis() - job.getLastBuild().getTimestamp();
+        long currentDuration = currentServerTimestamp - job.getLastBuild().getTimestamp();
         long lastDuration = job.getLastSuccessfulBuild().getDuration();
         long percentage = currentDuration / (lastDuration / 100);
 

client/src/main/java/de/pellepelster/jenkins/walldisplay/model/Hudson.java

@@ -15,6 +15,7 @@ public class Hudson {
     private List<Job> jobs = new ArrayList<Job>();
     private List<View> views = new ArrayList<View>();
     private String nodeDescription;
+    private long serverResponseTimestamp;
 
     /**
      * @return the nodeDescription
@@ -57,4 +58,18 @@ public List<Job> getJobs() {
     public void setJobs(List<Job> jobs) {
         this.jobs = jobs;
     }
+
+    /**
+     * @return the serverResponseTimestamp
+     */
+    public long getServerResponseTimestamp() {
+        return serverResponseTimestamp;
+    }
+
+    /**
+     * @param serverResponseTimestamp the serverResponseTimestamp to set
+     */
+    public void setServerResponseTimestamp(long serverResponseTimestamp) {
+        this.serverResponseTimestamp = serverResponseTimestamp;
+    }
 }