Version 0.00
# -*- coding: utf-8 -*-
# counter_demo.py V0.00
# TODOS:
# 1) Combine format with the counter information
# 2) Define global counter for consistent recording
# 3) Make use of session mechanism to prevent refreshing pages
from django.http import HttpResponse
# use self-defined counter
from counter import Counter
def counter_demo(request):
record = Counter()
record.open()
record.incre()
record.update()
output = '''
网站访问计数器Demo
您是第 %s 位访问者
''' % record.get()
record.close()
return HttpResponse(output)
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# counter.py V0.00
# 1) create a record and store it somewhere (in file or database)
# 2) increment the record if there are new visitors
# 3) update the backup-stored recored
# TODOS:
# 1) Improve for concurrent environment by using whatever locking mechanism
# 2) Testing for file existed is consuming, so should refine the code
# to make use of the test result to reduce file open/close operation
LOG_FILE = 'counter.log'
class Counter(object):
def __init__(self, logfile = LOG_FILE):
self.log = logfile
# ensure the log file exists before being accessed
try:
open(self.log, 'r').close()
except:
open(self.log, 'w').close()
def open(self):
'Get the recorded counter'
logfile = open(self.log, 'r')
record = logfile.read().strip()
if record:
self.record = int(record)
else:
self.record = 0
logfile.close()
def incre(self):
self.record += 1
def update(self):
'store the backup counter'
logfile = open(self.log, 'w')
logfile.write(str(self.record))
logfile.close()
def get(self):
'give the numeric counter'
return self.record
def close(self):
self.update()
self.log = ''
self.record = -1
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@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Version 0.01
# -*- coding: utf-8 -*-
# counter_demo.py V0.01
# TODOs:
# 1) Combine format with the counter information
# 2) Define global counter for consistent recording
# DOs:
# 1) request.session needs support form database, so settings.py
# should be modified to support database
from django.http import HttpResponse
# use self-defined counter
from counter import Counter
def counter_demo(request):
record = Counter()
record.open()
record.incre()
record.update()
if not request.session.get('counter', None):
count = record.get()
request.session['counter'] = count
record.close()
count = request.session.get('counter', None)
output = '''
网站访问计数器Demo
您是第 %s 位访问者
''' % count
return HttpResponse(output)
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--- counter_demo.bak 2009-12-10 21:51:31.000000000 +0800
+++ counter_demo.py 2009-12-18 19:00:54.000000000 +0800
@@ -12,13 +12,19 @@
record.incre()
record.update()
+ if not request.session.get('counter', None):
+ count = record.get()
+ request.session['counter'] = count
+
+ record.close()
+
+ count = request.session.get('counter', None)
+
output = '''
网站访问计数器Demo
您是第 %s 位访问者
- ''' % record.get()
-
- record.close()
+ ''
|
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