From e1b500ec96987de595da1541a73a7d5fb9eece9c Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Wed, 7 Sep 2011 15:26:26 -0700
Subject: LRU cache in mysql and sqlite are now per-process caches.

---
 .../connection_adapters/mysql_adapter.rb           | 27 +++++++++++++---------
 .../connection_adapters/sqlite_adapter.rb          | 24 +++++++++++--------
 2 files changed, 30 insertions(+), 21 deletions(-)

(limited to 'activerecord/lib/active_record')

diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index 73e3afe1d5..a1824fe396 100644
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -94,27 +94,32 @@ module ActiveRecord
       class StatementPool < ConnectionAdapters::StatementPool
         def initialize(connection, max = 1000)
           super
-          @cache = {}
+          @cache = Hash.new { |h,pid| h[pid] = {} }
         end
 
-        def each(&block); @cache.each(&block); end
-        def key?(key);    @cache.key?(key); end
-        def [](key);      @cache[key]; end
-        def length;       @cache.length; end
-        def delete(key);  @cache.delete(key); end
+        def each(&block); cache.each(&block); end
+        def key?(key);    cache.key?(key); end
+        def [](key);      cache[key]; end
+        def length;       cache.length; end
+        def delete(key);  cache.delete(key); end
 
         def []=(sql, key)
-          while @max <= @cache.size
-            @cache.shift.last[:stmt].close
+          while @max <= cache.size
+            cache.shift.last[:stmt].close
           end
-          @cache[sql] = key
+          cache[sql] = key
         end
 
         def clear
-          @cache.values.each do |hash|
+          cache.values.each do |hash|
             hash[:stmt].close
           end
-          @cache.clear
+          cache.clear
+        end
+
+        private
+        def cache
+          @cache[$$]
         end
       end
 
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
index 7c7e762c19..1932a849ee 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb
@@ -52,29 +52,33 @@ module ActiveRecord
       class StatementPool < ConnectionAdapters::StatementPool
         def initialize(connection, max)
           super
-          @cache = {}
+          @cache = Hash.new { |h,pid| h[pid] = {} }
         end
 
-        def each(&block); @cache.each(&block); end
-        def key?(key);    @cache.key?(key); end
-        def [](key);      @cache[key]; end
-        def length;       @cache.length; end
+        def each(&block); cache.each(&block); end
+        def key?(key);    cache.key?(key); end
+        def [](key);      cache[key]; end
+        def length;       cache.length; end
 
         def []=(sql, key)
-          while @max <= @cache.size
-            dealloc(@cache.shift.last[:stmt])
+          while @max <= cache.size
+            dealloc(cache.shift.last[:stmt])
           end
-          @cache[sql] = key
+          cache[sql] = key
         end
 
         def clear
-          @cache.values.each do |hash|
+          cache.values.each do |hash|
             dealloc hash[:stmt]
           end
-          @cache.clear
+          cache.clear
         end
 
         private
+        def cache
+          @cache[$$]
+        end
+
         def dealloc(stmt)
           stmt.close unless stmt.closed?
         end
-- 
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