Add jwutils.StopWatch

Add StopWatch class, intended to be useful for benchmarking.

Signed-off-by: Jan Lindemann <jan@janware.com>

tools/python/jwutils/StopWatch.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+
+import datetime
+from .log import *
+
+class StopWatch: # export
+
+    def __init__(self, name=''):
+        self.__start = datetime.now()
+        self.__last = self.__start
+        self.name = name
+
+    def reset(self):
+        self.__start = datetime.now()
+
+    def logDelta(self, prio, *args, **kwargs):
+        now = datetime.now()
+        if args is not None:
+            msg = ' '.join(args)
+        else:
+            msg = '------------------ '
+        caller = kwargs['caller'] if 'caller' in kwargs.keys() else get_caller_pos(1)
+        slog(prio, '{} {} {}'.format(self.name, str(now - self.__last), msg), caller=caller)
+        self.__last = now