From 7f6017c4a8f167fc3221de33f995727d1ee6147a Mon Sep 17 00:00:00 2001
From: Joey Butler <Joey.butler@livingsocial.com>
Date: Sun, 9 Sep 2012 13:04:35 -0400
Subject: Refactor ActiveSupport::Cache::Store#fetch.

---
 activesupport/lib/active_support/cache.rb | 66 +++++++++++++++++++------------
 1 file changed, 41 insertions(+), 25 deletions(-)

(limited to 'activesupport/lib/active_support')

diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index 5a5548d567..6a1f1fefb8 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -275,34 +275,14 @@ module ActiveSupport
         if block_given?
           options = merged_options(options)
           key = namespaced_key(name, options)
-          unless options[:force]
-            entry = instrument(:read, name, options) do |payload|
-              payload[:super_operation] = :fetch if payload
-              read_entry(key, options)
-            end
-          end
-          if entry && entry.expired?
-            race_ttl = options[:race_condition_ttl].to_i
-            if race_ttl && (Time.now - entry.expires_at <= race_ttl)
-              # When an entry has :race_condition_ttl defined, put the stale entry back into the cache
-              # for a brief period while the entry is begin recalculated.
-              entry.expires_at = Time.now + race_ttl
-              write_entry(key, entry, :expires_in => race_ttl * 2)
-            else
-              delete_entry(key, options)
-            end
-            entry = nil
-          end
+
+          cached_entry = find_cached_entry(key, name, options) unless options[:force]
+          entry = handle_expired_entry(cached_entry, key, options)
 
           if entry
-            instrument(:fetch_hit, name, options) { |payload| }
-            entry.value
+            get_entry_value(entry, name, options)
           else
-            result = instrument(:generate, name, options) do |payload|
-              yield(name)
-            end
-            write(name, result, options)
-            result
+            save_block_result_to_cache(name, options) { |name| yield name }
           end
         else
           read(name, options)
@@ -531,6 +511,42 @@ module ActiveSupport
           return unless logger && logger.debug? && !silence?
           logger.debug("Cache #{operation}: #{key}#{options.blank? ? "" : " (#{options.inspect})"}")
         end
+
+        def find_cached_entry(key, name, options)
+          instrument(:read, name, options) do |payload|
+            payload[:super_operation] = :fetch if payload
+            read_entry(key, options)
+          end
+        end
+
+        def handle_expired_entry(entry, key, options)
+          if entry && entry.expired?
+            race_ttl = options[:race_condition_ttl].to_i
+            if race_ttl && (Time.now - entry.expires_at <= race_ttl)
+              # When an entry has :race_condition_ttl defined, put the stale entry back into the cache
+              # for a brief period while the entry is begin recalculated.
+              entry.expires_at = Time.now + race_ttl
+              write_entry(key, entry, :expires_in => race_ttl * 2)
+            else
+              delete_entry(key, options)
+            end
+            entry = nil
+          end
+          entry
+        end
+
+        def get_entry_value(entry, name, options)
+          instrument(:fetch_hit, name, options) { |payload| }
+          entry.value
+        end
+
+        def save_block_result_to_cache(name, options)
+          result = instrument(:generate, name, options) do |payload|
+            yield(name)
+          end
+          write(name, result, options)
+          result
+        end
     end
 
     # This class is used to represent cache entries. Cache entries have a value and an optional
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