Send notifications on the IO thread when changes are made to the special storage policy. Listen f...

webkit/quota/usage_tracker.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_QUOTA_USAGE_TRACKER_H_
 #define WEBKIT_QUOTA_USAGE_TRACKER_H_
 #pragma once
 
 #include <list>
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_callback_factory.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/threading/non_thread_safe.h"
 #include "googleurl/src/gurl.h"
 #include "webkit/quota/quota_client.h"
 #include "webkit/quota/quota_task.h"
 #include "webkit/quota/quota_types.h"
+#include "webkit/quota/special_storage_policy.h"
 
 namespace quota {
 
 class ClientUsageTracker;
-class SpecialStoragePolicy;
 
 // A helper class that gathers and tracks the amount of data stored in
 // all quota clients.
 // An instance of this class is created per storage type.
 class UsageTracker : public QuotaTaskObserver {
  public:
   UsageTracker(const QuotaClientList& clients, StorageType type,
                SpecialStoragePolicy* special_storage_policy);
   virtual ~UsageTracker();
 
@@ skipping 35 matching lines @@
 
   GlobalUsageCallbackQueue global_usage_callbacks_;
   HostUsageCallbackMap host_usage_callbacks_;
 
   base::ScopedCallbackFactory<UsageTracker> callback_factory_;
   DISALLOW_COPY_AND_ASSIGN(UsageTracker);
 };
 
 // This class holds per-client usage tracking information and caches per-host
 // usage data.  An instance of this class is created per client.
-class ClientUsageTracker {
+class ClientUsageTracker : public SpecialStoragePolicy::Observer,
+                           public base::NonThreadSafe {
  public:
   ClientUsageTracker(UsageTracker* tracker,
                      QuotaClient* client,
                      StorageType type,
                      SpecialStoragePolicy* special_storage_policy);
-  ~ClientUsageTracker();
+  virtual ~ClientUsageTracker();
 
   void GetGlobalUsage(GlobalUsageCallback* callback);
   void GetHostUsage(const std::string& host, HostUsageCallback* callback);
   void UpdateUsageCache(const GURL& origin, int64 delta);
   void GetCachedOrigins(std::set<GURL>* origins) const;
 
  private:
   typedef std::set<std::string> HostSet;
   typedef std::map<GURL, int64> UsageMap;
   typedef std::map<std::string, UsageMap> HostUsageMap;
 
   class GatherUsageTaskBase;
   class GatherGlobalUsageTask;
   class GatherHostUsageTask;
 
   // Methods used by our GatherUsage tasks, as a task makes progress
   // origins and hosts are added incrementally to the cache.
   void AddCachedOrigin(const GURL& origin, int64 usage);
   void AddCachedHost(const std::string& host);
   void GatherGlobalUsageComplete();
   void GatherHostUsageComplete(const std::string& host);
 
   int64 GetCachedHostUsage(const std::string& host);
-
+  int64 GetCachedGlobalUnlimitedUsage();
+  virtual void OnSpecialStoragePolicyChanged() OVERRIDE;
   void NoopHostUsageCallback(
     const std::string& host,  StorageType type, int64 usage);
-
   bool IsStorageUnlimited(const GURL& origin) const;
 
   UsageTracker* tracker_;
   QuotaClient* client_;
   const StorageType type_;
 
   int64 global_usage_;
   int64 global_unlimited_usage_;
   bool global_usage_retrieved_;
+  bool global_unlimited_usage_is_valid_;
   HostSet cached_hosts_;
   HostUsageMap cached_usage_;
 
   GatherGlobalUsageTask* global_usage_task_;
   GlobalUsageCallbackQueue global_usage_callback_;
   std::map<std::string, GatherHostUsageTask*> host_usage_tasks_;
   HostUsageCallbackMap host_usage_callbacks_;
 
   scoped_refptr<SpecialStoragePolicy> special_storage_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientUsageTracker);
 };
 
 }  // namespace quota
 
 #endif  // WEBKIT_QUOTA_USAGE_TRACKER_H_