Added ability to use a different cache backend.

README.rst

@@ -39,6 +39,13 @@ they will be silently stripped.
 If COMPRESS is False (defaults to the opposite of DEBUG) the compress tag
 simply returns exactly what it was given, to ease development.
 
+.. note::
+
+    For production sites it is advisable to use a real cache backend such as
+    memcached to speed up the checks of compressed files. Make sure you
+    set the ``CACHE_BACKEND`` setting (or ``COMPRESS_CACHE_BACKEND``)
+    appropriately.
+
 
 CSS Notes:
 **********
@@ -161,6 +168,14 @@ The backends included in ``compressor``:
 
 See `Dependencies`_ for more info about the packages you need for each parser.
 
+``COMPRESS_CACHE_BACKEND``
+--------------------------
+
+:Default: ``CACHE_BACKEND``
+
+The backend to use for caching, in case you want to use a different cache
+backend for compressor. Defaults to the ``CACHE_BACKEND`` setting.
+
 ``COMPRESS_REBUILD_TIMEOUT``
 ----------------------------
 

compressor/cache.py

@@ -0,0 +1,4 @@
+from django.core.cache import get_cache
+from compressor.conf import settings
+
+cache = get_cache(settings.CACHE_BACKEND)

compressor/conf/settings.py

@@ -1,7 +1,5 @@
-from django.core.exceptions import ImproperlyConfigured
 from django.conf import settings
 
-
 MEDIA_URL = getattr(settings, 'COMPRESS_URL', settings.MEDIA_URL)
 MEDIA_ROOT = getattr(settings, 'COMPRESS_ROOT', settings.MEDIA_ROOT)
 OUTPUT_DIR = getattr(settings, 'COMPRESS_OUTPUT_DIR', 'CACHE')
@@ -49,3 +47,6 @@ PARSER = getattr(settings, 'COMPRESS_PARSER', 'compressor.parser.BeautifulSoupPa
 
 # Allows changing verbosity from the settings.
 VERBOSE = getattr(settings, "COMPRESS_VERBOSE", False)
+
+# the cache backend to use
+CACHE_BACKEND = getattr(settings, 'COMPRESS_CACHE_BACKEND', settings.CACHE_BACKEND)

compressor/management/commands/mtime_cache.py

@@ -2,9 +2,9 @@ import fnmatch
 import os
 from optparse import make_option
 
-from django.core.cache import cache
 from django.core.management.base import NoArgsCommand, CommandError
 
+from compressor.cache import cache
 from compressor.conf import settings
 from compressor.utils import get_mtime, get_mtime_cachekey
 

compressor/templatetags/compress.py

@@ -1,8 +1,9 @@
 import time
 
 from django import template
-from django.core.cache import cache
+
 from compressor import CssCompressor, JsCompressor
+from compressor.cache import cache
 from compressor.conf import settings
 
 

compressor/utils.py

@@ -1,5 +1,5 @@
 import os
-from django.core.cache import cache
+from compressor.cache import cache
 from compressor.conf import settings
 from compressor.exceptions import FilterError
 

tests/core/tests.py

@@ -7,6 +7,7 @@ from django.template import Template, Context, TemplateSyntaxError
 from django.test import TestCase
 from django.core.files.storage import get_storage_class
 from django.conf import settings as django_settings
+from django.core.cache.backends import dummy
 
 from compressor import CssCompressor, JsCompressor, storage
 from compressor.conf import settings
@@ -364,3 +365,10 @@ class VerboseTestCase(CompressorTestCase):
     def setUp(self):
         super(VerboseTestCase, self).setUp()
         setattr(settings, "COMPRESS_VERBOSE", True)
+
+
+class CacheBackendTestCase(CompressorTestCase):
+
+    def test_correct_backend(self):
+        from compressor.cache import cache
+        self.assertEqual(cache.__class__, dummy.CacheClass)

tests/settings.py

@@ -22,4 +22,7 @@ TEMPLATE_LOADERS = (
 
 TEMPLATE_DIRS = (
     join(TEST_DIR, 'templates'),
-)
+)
+
+COMPRESS_CACHE_BACKEND = "dummy://"
+