import time
class TerseLogger:
def __init__(self, max_silent_time=60, display_time=False):
self.prev_msg = None
self.last_msg_time = 0
self.max_silent_time = max_silent_time
self.display_time = display_time
# yeah - emit is actually a bad name because it doesn't emit every time...
def emit(self, msg):
now = time.time()
# actually print message if either a) or b) applies
# a) it is different from previous message
# b) max_silent_time seconds have passed since last message
if self.prev_msg != msg \
or now - self.last_msg_time >= self.max_silent_time:
if self.display_time:
print "%d %s" % (now, msg)
else:
print msg
self.prev_msg = msg
self.last_msg_time = now
if __name__ == '__main__':
obj = TerseLogger(display_time=True)
messages = ('cat', 'dog', 'cat', 'cat', 'penguin')
print "message is not printed if it was the same as previous message"
for msg in messages:
obj.emit(msg)
obj = TerseLogger(1, display_time=True)
print ("all messages are printed because max_silent_time "
"was set to 1 second and we sleep 2 seconds after each iteration")
for msg in messages:
obj.emit(msg)
time.sleep(2)
