Provide monitoring of usage for a storage type and origin

webkit/browser/quota/quota_manager.h

 // Copyright 2013 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_BROWSER_QUOTA_QUOTA_MANAGER_H_
 #define WEBKIT_BROWSER_QUOTA_QUOTA_MANAGER_H_
 
 #include <deque>
 #include <list>
 #include <map>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "webkit/browser/quota/quota_callbacks.h"
 #include "webkit/browser/quota/quota_client.h"
 #include "webkit/browser/quota/quota_database.h"
 #include "webkit/browser/quota/quota_task.h"
 #include "webkit/browser/quota/special_storage_policy.h"
+#include "webkit/browser/quota/storage_observer.h"
 #include "webkit/browser/webkit_storage_browser_export.h"
 
 namespace base {
 class FilePath;
 class SequencedTaskRunner;
 class SingleThreadTaskRunner;
 }
 
 namespace quota_internals {
 class QuotaInternalsProxy;
 }
 
 namespace quota {
 
 class MockQuotaManager;
 class QuotaDatabase;
 class QuotaManagerProxy;
 class QuotaTemporaryStorageEvictor;
+class StorageMonitor;
 class UsageTracker;
 
 struct QuotaManagerDeleter;
 
 struct WEBKIT_STORAGE_BROWSER_EXPORT UsageAndQuota {
   int64 usage;
   int64 global_limited_usage;
   int64 quota;
   int64 available_disk_space;
 
@@ skipping 162 matching lines @@
     return special_storage_policy_.get() &&
            special_storage_policy_->CanQueryDiskSize(origin);
   }
 
   virtual void GetOriginsModifiedSince(StorageType type,
                                        base::Time modified_since,
                                        const GetOriginsCallback& callback);
 
   bool ResetUsageTracker(StorageType type);
 
+  // Used to register/deregister observers that wish to monitor storage events.
+  void AddStorageObserver(StorageObserver* observer,
+                          const StorageObserver::MonitorParams& params);
+  void RemoveStorageObserver(StorageObserver* observer);
+  void RemoveStorageObserverForFilter(StorageObserver* observer,
+                                      const StorageObserver::Filter& filter);
+
   // Determines the portion of the temp pool that can be
   // utilized by a single host (ie. 5 for 20%).
   static const int kPerHostTemporaryPortion;
 
   static const int64 kPerHostPersistentQuotaLimit;
 
   static const char kDatabaseName[];
 
   static const int64 kMinimumPreserveForSystem;
 
@@ skipping 12 matching lines @@
  private:
   friend class base::DeleteHelper<QuotaManager>;
   friend class base::RefCountedThreadSafe<QuotaManager, QuotaManagerDeleter>;
   friend class MockQuotaManager;
   friend class MockStorageClient;
   friend class quota_internals::QuotaInternalsProxy;
   friend class QuotaManagerProxy;
   friend class QuotaManagerTest;
   friend class QuotaTemporaryStorageEvictor;
   friend struct QuotaManagerDeleter;
+  friend class StorageMonitorTest;
 
   class GetUsageInfoTask;
 
   class OriginDataDeleter;
   class HostDataDeleter;
 
   class GetModifiedSinceHelper;
   class DumpQuotaTableHelper;
   class DumpOriginInfoTableHelper;
 
@@ skipping 148 matching lines @@
 
   scoped_refptr<SpecialStoragePolicy> special_storage_policy_;
 
   base::RepeatingTimer<QuotaManager> histogram_timer_;
 
   // Pointer to the function used to get the available disk space. This is
   // overwritten by QuotaManagerTest in order to attain a deterministic reported
   // value. The default value points to base::SysInfo::AmountOfFreeDiskSpace.
   GetAvailableDiskSpaceFn get_disk_space_fn_;
 
+  scoped_ptr<StorageMonitor> storage_monitor_;
+
   base::WeakPtrFactory<QuotaManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuotaManager);
 };
 
 struct QuotaManagerDeleter {
   static void Destruct(const QuotaManager* manager) {
     manager->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace quota
 
 #endif  // WEBKIT_BROWSER_QUOTA_QUOTA_MANAGER_H_