Move auto-expiring cache to /examples.

README.rdoc

@@ -401,41 +401,10 @@ If you need to expire cached content:
 
 Do *not* include the prefix when passing a URL to be expired. Expiring <tt>:all</tt> will only expire keys with the configured prefix (won't kill every entry in your key/value store).
 
-<i>Before you implement caching in your app please be sure that doing so does not violate the Terms of Service for your geocoding service.</i>
-
-If you want to use Redis as a cache store, with values that expire automatically every 24 hours (or any other TTL), you can do this in the initialize :
+For an example of a cache store with URL expiry please see examples/autoexpire_cache.rb
 
-  class GeocoderAutoexpireCache
-    def initialize(store)
-      @store = store
-      @ttl = 86400
-    end
-
-    def [](url)
-      @store.[](url)
-    end
-
-    def []=(url, value)
-      @store.[]=(url, value)
-      @store.expire(url, @ttl)
-    end
-
-    def keys
-      @store.keys
-    end
-
-    def del(url)
-      @store.del(url)
-    end
-  end
-
-  Geocoder.configure do |config|
-    config.cache = GeocoderAutoexpireCache.new(Redis.new)
-  end
-
-It's a simple delegation to the Redis store, but when it creates a key/value pair, it is also sending an `EXPIRE` command with a `TTL`
+<i>Before you implement caching in your app please be sure that doing so does not violate the Terms of Service for your geocoding service.</i>
 
-It should be fairly simple to do the same thing with `Memcached`.
 
 == Forward and Reverse Geocoding in the Same Model
 

examples/autoexpire_cache.rb

+# This class implements a cache with simple delegation to the Redis store, but
+# when it creates a key/value pair, it also sends an EXPIRE command with a TTL.
+# It should be fairly simple to do the same thing with Memcached.
+class AutoexpireCache
+  def initialize(store)
+    @store = store
+    @ttl = 86400
+  end
+
+  def [](url)
+    @store.[](url)
+  end
+
+  def []=(url, value)
+    @store.[]=(url, value)
+    @store.expire(url, @ttl)
+  end
+
+  def keys
+    @store.keys
+  end
+
+  def del(url)
+    @store.del(url)
+  end
+end
+
+Geocoder.configure do |config|
+  config.cache = AutoexpireCache.new(Redis.new)
+end