Added a new 'reinitialize' method to the backend-logger interface to

support log-rotation. See the new stupid logger and the ZEO server
log-rotation signal handler for examples.

lib/python/zLOG.py

@@ -139,6 +139,10 @@ with a callable object that takes 5 arguments:
                traceback.  If provided, then a summary of the error
                is added to the detail.
 
+The callable object can provide a reinitialize method that may be
+called with no arguments to reopen the log files (if any) as part of a
+log-rotation facility. 
+
 There is a default stupid logging facility that:
 
   - swallows logging information by default,
@@ -228,7 +232,13 @@ def log_time():
 _stupid_dest=None
 _stupid_severity=None
 _no_stupid_log=[]
-def stupid_log_write(subsystem, severity, summary, detail, error):
+class stupid_log_write:
+
+    def reinitialize(self):
+        global _stupid_dest
+        _stupid_dest = None        
+    
+    def __call__(self, subsystem, severity, summary, detail, error):
 
         global _stupid_dest
         if _stupid_dest is None:
@@ -274,7 +284,7 @@ def stupid_log_write(subsystem, severity, summary, detail, error):
         _stupid_dest.flush()
 
 
-log_write=stupid_log_write
+log_write=stupid_log_write()
 
 format_exception_only=None
 def format_exception(etype,value,tb,limit=None, delimiter='\n',