Introduce a notification to trigger memory purging on the IO thread and use it in ChromeAppCacheService.

TEST=manual
BUG=none

Review URL: http://codereview.chromium.org/547016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@36181 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 21 insertions, 1 deletions

diff --git a/chrome/common/appcache/chrome_appcache_service.cc b/chrome/common/appcache/chrome_appcache_service.cc
index c1016cb..cb1f7a3 100644
--- a/chrome/common/appcache/chrome_appcache_service.cc
+++ b/chrome/common/appcache/chrome_appcache_service.cc
@@ -7,6 +7,7 @@
 #include "base/file_path.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/common/chrome_constants.h"
+#include "chrome/common/notification_service.h"
 #include "webkit/appcache/appcache_thread.h"
 
 static bool has_initialized_thread_ids;
@@ -20,12 +21,22 @@ ChromeAppCacheService::ChromeAppCacheService(const FilePath& data_directory,
   }
   Initialize(is_incognito ? FilePath()
                           : data_directory.Append(chrome::kAppCacheDirname));
+
+  registrar_.Add(
+      this, NotificationType::PURGE_MEMORY, NotificationService::AllSources());
 }
 
 ChromeAppCacheService::~ChromeAppCacheService() {
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::IO));
 }
 
+void ChromeAppCacheService::Observe(NotificationType type,
+                                    const NotificationSource& source,
+                                    const NotificationDetails& details) {
+  DCHECK(type == NotificationType::PURGE_MEMORY);
+  PurgeMemory();
+}
+
 static ChromeThread::ID ToChromeThreadID(int id) {
   DCHECK(has_initialized_thread_ids);
   DCHECK(id == ChromeThread::DB || id == ChromeThread::IO);
diff --git a/chrome/common/appcache/chrome_appcache_service.h b/chrome/common/appcache/chrome_appcache_service.h
index 509afd2..a202601 100644
--- a/chrome/common/appcache/chrome_appcache_service.h
+++ b/chrome/common/appcache/chrome_appcache_service.h
@@ -6,6 +6,7 @@
 #define CHROME_COMMON_APPCACHE_CHROME_APPCACHE_SERVICE_H_
 
 #include "base/ref_counted.h"
+#include "chrome/common/notification_registrar.h"
 #include "webkit/appcache/appcache_service.h"
 
 class FilePath;
@@ -20,13 +21,21 @@ class FilePath;
 // the IO thread.
 class ChromeAppCacheService
     : public base::RefCounted<ChromeAppCacheService>,
-      public appcache::AppCacheService {
+      public appcache::AppCacheService,
+      public NotificationObserver {
  public:
   ChromeAppCacheService(const FilePath& data_directory,
                         bool is_incognito);
  private:
   friend class base::RefCounted<ChromeAppCacheService>;
   virtual ~ChromeAppCacheService();
+
+  // NotificationObserver override
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_COMMON_APPCACHE_CHROME_APPCACHE_SERVICE_H_