# HG changeset patch
# User neko259 <neko259@gmail.com>
# Date 2015-01-27 20:02:27
# Node ID 3848eb1fe2c24b98b740e66c65da941895dd91fb
# Parent  61b1dba099725858cd3e240278a26c70cc173730

Started work on the method caching decorator (BB-57)

diff --git a/boards/models/post.py b/boards/models/post.py
--- a/boards/models/post.py
+++ b/boards/models/post.py
@@ -4,7 +4,6 @@ import logging
 import re
 
 from adjacent import Client
-from django.core.cache import cache
 from django.core.urlresolvers import reverse
 from django.db import models, transaction
 from django.db.models import TextField
@@ -16,7 +15,7 @@ from boards.mdx_neboard import bbcode_ex
 from boards.models import PostImage
 from boards.models.base import Viewable
 from boards.models.thread import Thread
-from boards.utils import datetime_to_epoch
+from boards.utils import datetime_to_epoch, cached_result
 
 
 WS_NOTIFICATION_TYPE_NEW_POST = 'new_post'
@@ -26,9 +25,6 @@ WS_CHANNEL_THREAD = "thread:"
 
 APP_LABEL_BOARDS = 'boards'
 
-CACHE_KEY_PPD = 'ppd'
-CACHE_KEY_POST_URL = 'post_url'
-
 POSTS_PER_DAY_RANGE = 7
 
 BAN_REASON_AUTO = 'Auto'
@@ -157,6 +153,7 @@ class PostManager(models.Manager):
                 referenced_thread.last_edit_time = post.pub_time
                 referenced_thread.save(update_fields=['last_edit_time'])
 
+    @cached_result
     def get_posts_per_day(self):
         """
         Gets average count of posts per day for the last 7 days
@@ -165,11 +162,6 @@ class PostManager(models.Manager):
         day_end = date.today()
         day_start = day_end - timedelta(POSTS_PER_DAY_RANGE)
 
-        cache_key = CACHE_KEY_PPD + str(day_end)
-        ppd = cache.get(cache_key)
-        if ppd:
-            return ppd
-
         day_time_start = timezone.make_aware(datetime.combine(
             day_start, dtime()), timezone.get_current_timezone())
         day_time_end = timezone.make_aware(datetime.combine(
@@ -181,7 +173,6 @@ class PostManager(models.Manager):
 
         ppd = posts_per_period / POSTS_PER_DAY_RANGE
 
-        cache.set(cache_key, ppd)
         return ppd
 
     def _preparse_text(self, text):
@@ -285,27 +276,22 @@ class Post(models.Model, Viewable):
         thread.last_edit_time = edit_time
         thread.save(update_fields=['last_edit_time'])
 
+    @cached_result
     def get_url(self, thread=None):
         """
         Gets full url to the post.
         """
 
-        cache_key = CACHE_KEY_POST_URL + str(self.id)
-        link = cache.get(cache_key)
+        if not thread:
+            thread = self.get_thread()
 
-        if not link:
-            if not thread:
-                thread = self.get_thread()
+        opening_id = thread.get_opening_post_id()
 
-            opening_id = thread.get_opening_post_id()
-
-            if self.id != opening_id:
-                link = reverse('thread', kwargs={
-                    'post_id': opening_id}) + '#' + str(self.id)
-            else:
-                link = reverse('thread', kwargs={'post_id': self.id})
-
-            cache.set(cache_key, link)
+        if self.id != opening_id:
+            link = reverse('thread', kwargs={
+                'post_id': opening_id}) + '#' + str(self.id)
+        else:
+            link = reverse('thread', kwargs={'post_id': self.id})
 
         return link
 
diff --git a/boards/models/thread.py b/boards/models/thread.py
--- a/boards/models/thread.py
+++ b/boards/models/thread.py
@@ -1,9 +1,12 @@
 import logging
+
 from django.db.models import Count, Sum
 from django.utils import timezone
-from django.core.cache import cache
 from django.db import models
+
 from boards import settings
+from boards.utils import cached_result
+
 
 __author__ = 'neko259'
 
@@ -11,9 +14,6 @@ from boards import settings
 logger = logging.getLogger(__name__)
 
 
-CACHE_KEY_OPENING_POST = 'opening_post_id'
-
-
 class ThreadManager(models.Manager):
     def process_oldest_threads(self):
         """
@@ -153,18 +153,13 @@ class Thread(models.Model):
 
         return opening_post
 
+    @cached_result
     def get_opening_post_id(self):
         """
         Gets ID of the first thread post.
         """
 
-        cache_key = CACHE_KEY_OPENING_POST + str(self.id)
-        opening_post_id = cache.get(cache_key)
-        if not opening_post_id:
-            opening_post_id = self.get_opening_post(only_id=True).id
-            cache.set(cache_key, opening_post_id)
-
-        return opening_post_id
+        return self.get_opening_post(only_id=True).id
 
     def __unicode__(self):
         return str(self.id)
diff --git a/boards/utils.py b/boards/utils.py
--- a/boards/utils.py
+++ b/boards/utils.py
@@ -3,6 +3,8 @@ This module contains helper functions an
 """
 import time
 import hmac
+from django.core.cache import cache
+from django.db.models import Model
 
 from django.utils import timezone
 
@@ -40,4 +42,27 @@ def get_websocket_token(user_id='', time
     sign.update(timestamp.encode())
     token = sign.hexdigest()
 
-    return token
\ No newline at end of file
+    return token
+
+
+def cached_result(function):
+    """
+    Caches method result in the Django's cache system, persisted by object name,
+    object name and model id if object is a Django model.
+    """
+    def inner_func(obj, *args, **kwargs):
+        # TODO Include method arguments to the cache key
+        cache_key = obj.__class__.__name__ + '_' + function.__name__
+        if isinstance(obj, Model):
+            cache_key += '_' + str(obj.id)
+
+        persisted_result = cache.get(cache_key)
+        if persisted_result:
+            result = persisted_result
+        else:
+            result = function(obj, *args, **kwargs)
+            cache.set(cache_key, result)
+
+        return result
+
+    return inner_func
\ No newline at end of file