code: public synchronized void stop() {
          for (final AttributeCache cache : attributeCacheMap.values()) {
              cache.stopRefresh();
          }
          for (final CommandCache cache : commandCacheMap.values()) {
              cache.stopRefresh();
          }
          if (stateCache != null) {
              stateCache.stopRefresh();
          }
          if (statusCache != null) {
              statusCache.stopRefresh();
          }
          if (POLLING_POOL != null) {
              POLLING_POOL.shutdownNow();
              POLLING_POOL = new ScheduledThreadPoolExecutor(poolSize, new TangoCacheThreadFactory());
          }
      }
docs: Stop all polling