[HUDSON-4590] only send a request up to every once in 10 seconds in order to...

[HUDSON-4590] only send a request up to every once in 10 seconds in order to avoid hitting java.net too hard when it's about to recover from an outage.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@22348 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/DownloadService.java

@@ -64,7 +64,7 @@ public class DownloadService extends PageDecorator {
         if(Hudson.getInstance().hasPermission(Hudson.READ)) {
             long now = System.currentTimeMillis();
             for (Downloadable d : Downloadable.all()) {
-                if(d.getDue()<now) {
+                if(d.getDue()<now && d.lastAttempt+10*1000<now) {
                     buf.append("<script>")
                        .append("Behaviour.addLoadEvent(function() {")
                        .append("  downloadService.download(")
@@ -79,6 +79,7 @@ public class DownloadService extends PageDecorator {
                        .append("null);")
                        .append("});")
                        .append("</script>");
+                    d.lastAttempt = now;
                 }
             }
         }
@@ -110,6 +111,7 @@ public class DownloadService extends PageDecorator {
         private final String url;
         private final long interval;
         private volatile long due=0;
+        private volatile long lastAttempt=Long.MIN_VALUE;
 
         /**
          *