From eb62ad214483022e5332da258f04c6480bce86cb Mon Sep 17 00:00:00 2001
From: Karel Minarik <karmi@karmi.cz>
Date: Thu, 14 Aug 2008 18:46:33 +0200
Subject: [PATCH] Added expire_fragment_by_glob() method to ActionController::Caching::Fragments

---
 .../lib/action_controller/caching/fragments.rb     |   14 ++++++++++++++
 actionpack/test/controller/caching_test.rb         |   19 +++++++++++++++++++
 2 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/actionpack/lib/action_controller/caching/fragments.rb b/actionpack/lib/action_controller/caching/fragments.rb
index e9b434d..6fb4601 100644
--- a/actionpack/lib/action_controller/caching/fragments.rb
+++ b/actionpack/lib/action_controller/caching/fragments.rb
@@ -133,6 +133,20 @@ module ActionController #:nodoc:
           end
         end
       end
+
+      # Expire fragment in <tt>ActiveSupport::Cache::FileStore</tt> by 'glob' value as argument, eg. 'some/deep/**/*/path'
+      # === Examples:
+      #   expire_fragment_by_glob('events/{theatre,movie}')
+      #   expire_fragment_by_glob('program/**/*')
+      # Motivation was to expire fragment for every hostname you are running your application on (application.com, application.org)
+      def expire_fragment_by_glob(pattern)
+        raise NoMethodError, "Not supported by #{cache_store.class}" unless cache_store.is_a?(ActiveSupport::Cache::FileStore)
+        # TODO: Would be nice to log here, but I keep getting 'uninitialized constant RAILS_DEFAULT_LOGGER' in tests
+        self.class.benchmark "Expired fragments by pattern: #{pattern}" do
+          Dir[ File.join(cache_store.cache_path, '**', "#{pattern}.cache") ].each { |path| FileUtils.rm_rf(path) }
+        end
+      end
+
     end
   end
 end
diff --git a/actionpack/test/controller/caching_test.rb b/actionpack/test/controller/caching_test.rb
index b6cdd11..f062093 100644
--- a/actionpack/test/controller/caching_test.rb
+++ b/actionpack/test/controller/caching_test.rb
@@ -572,6 +572,25 @@ class FragmentCachingTest < Test::Unit::TestCase
   end
 end
 
+class FileStoreFragmentCachingTest < FragmentCachingTest                                         # Inherit setup method, but...
+  self.public_instance_methods.select { |m| m =~ /^test_/ }.each { |m| undef_method(m.to_sym)  } # ... undefine test methods from parent
+  def setup
+    super
+    @store = ActiveSupport::Cache::FileStore.new(Dir.pwd)
+    ActionController::Base.cache_store = @store
+  end
+
+  def test_expire_fragment_with_glob
+    @store.write('views/name/other/name', 'value')
+
+    @controller.expire_fragment_by_glob 'views/name/*'                   # Do not expire with this glob...
+    assert_equal 'value', @store.read('views/name/other/name')
+
+    @controller.expire_fragment_by_glob 'views/name/**/*'                # ...but do expire with this one.
+    assert_nil @store.read('views/name/other/name')
+  end
+end
+
 class FunctionalCachingController < ActionController::Base
   def fragment_cached
   end
-- 
1.5.5