From 49ab556cfe14de363a74ce771931832304a1a038 Mon Sep 17 00:00:00 2001
From: "satish@chromium.org"
 <satish@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98>
Date: Sat, 11 Dec 2010 09:13:54 +0000
Subject: Make members of Singleton<T> private and only visible to the
 singleton type. This enforces that the Singleton<T> pattern can only be used
 within classes which want singleton-ness.

As part of this CL I have also fixed up files which got missed in my previous CLs to use a GetInstance() method and use Singleton<T> from the source file.

There are a small number of places where I have also switched to LazyInstance as that was more appropriate for types used in a single source file.

BUG=65298
TEST=all existing tests should continue to pass.

Review URL: http://codereview.chromium.org/5682008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@68932 0039d316-1c4b-4281-b951-d872f2087c98
---
 webkit/blob/deletable_file_reference.cc | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

(limited to 'webkit/blob')

diff --git a/webkit/blob/deletable_file_reference.cc b/webkit/blob/deletable_file_reference.cc
index 87ef4cc..7a5cfac 100644
--- a/webkit/blob/deletable_file_reference.cc
+++ b/webkit/blob/deletable_file_reference.cc
@@ -7,27 +7,25 @@
 #include <map>
 #include "base/file_util.h"
 #include "base/file_util_proxy.h"
+#include "base/lazy_instance.h"
 #include "base/message_loop_proxy.h"
-#include "base/singleton.h"
 
 namespace webkit_blob {
 
 namespace {
 
 typedef std::map<FilePath, DeletableFileReference*> DeleteableFileMap;
-
-DeleteableFileMap* map() {
-  return Singleton<DeleteableFileMap>::get();
-}
+static base::LazyInstance<DeleteableFileMap> g_deletable_file_map(
+    base::LINKER_INITIALIZED);
 
 }  // namespace
 
 // static
 scoped_refptr<DeletableFileReference> DeletableFileReference::Get(
     const FilePath& path) {
-  DeleteableFileMap::iterator found = map()->find(path);
+  DeleteableFileMap::iterator found = g_deletable_file_map.Get().find(path);
   DeletableFileReference* reference =
-      (found == map()->end()) ? NULL : found->second;
+      (found == g_deletable_file_map.Get().end()) ? NULL : found->second;
   return scoped_refptr<DeletableFileReference>(reference);
 }
 
@@ -36,7 +34,7 @@ scoped_refptr<DeletableFileReference> DeletableFileReference::GetOrCreate(
     const FilePath& path, base::MessageLoopProxy* file_thread) {
   DCHECK(file_thread);
   typedef std::pair<DeleteableFileMap::iterator, bool> InsertResult;
-  InsertResult result = map()->insert(
+  InsertResult result = g_deletable_file_map.Get().insert(
       DeleteableFileMap::value_type(path, NULL));
   if (result.second == false)
     return scoped_refptr<DeletableFileReference>(result.first->second);
@@ -51,12 +49,12 @@ scoped_refptr<DeletableFileReference> DeletableFileReference::GetOrCreate(
 DeletableFileReference::DeletableFileReference(
     const FilePath& path, base::MessageLoopProxy* file_thread)
     : path_(path), file_thread_(file_thread) {
-  DCHECK(map()->find(path_)->second == NULL);
+  DCHECK(g_deletable_file_map.Get().find(path_)->second == NULL);
 }
 
 DeletableFileReference::~DeletableFileReference() {
-  DCHECK(map()->find(path_)->second == this);
-  map()->erase(path_);
+  DCHECK(g_deletable_file_map.Get().find(path_)->second == this);
+  g_deletable_file_map.Get().erase(path_);
   base::FileUtilProxy::Delete(file_thread_, path_, false /* recursive */, NULL);
 }
 
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