[2136] Updated the 'show' command handler

The stats module decides if polling should be done by the the last time of
polling. If more than one seconds past since the last request to each module,
the stats module requests each module statistics data and then shows the latest
result. Otherwise, the stats module just shows statistics data which it has.

src/bin/stats/stats.py.in

@@ -164,6 +164,8 @@ class Stats:
              'last_update_time': get_datetime()}):
             logger.warn(STATS_RECEIVED_INVALID_STATISTICS_DATA,
                         self.module_name)
+        # define the variable of the last time of polling
+        self._lasttime_poll = 0.0
         # try to do polling firstly
         self.do_polling()
 
@@ -238,6 +240,8 @@ class Stats:
                     logger.warn(
                         STATS_RECEIVED_INVALID_STATISTICS_DATA,
                         self.module_name)
+        # if successfully done, set the last time of polling
+        self._lasttime_poll = get_timestamp()
 
     def start(self):
         """
@@ -487,6 +491,14 @@ class Stats:
         """
         handle show command
         """
+        # decide if polling should be done by the the last time of
+        # polling. If more than one seconds past since the last
+        # request to each module, the stats module requests each
+        # module statistics data and then shows the latest
+        # result. Otherwise, the stats module just shows statistics
+        # data which it has.
+        if get_timestamp() - self._lasttime_poll > 1.0:
+            self.do_polling()
         if owner or name:
             logger.debug(DBG_STATS_MESSAGING,
                          STATS_RECEIVED_SHOW_NAME_COMMAND,