storage/browser/quota/usage_tracker.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef STORAGE_BROWSER_QUOTA_USAGE_TRACKER_H_
   6 #define STORAGE_BROWSER_QUOTA_USAGE_TRACKER_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11
  12 #include "base/basictypes.h"
  13 #include "base/callback.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/threading/non_thread_safe.h"
  16 #include "storage/browser/quota/quota_callbacks.h"
  17 #include "storage/browser/quota/quota_client.h"
  18 #include "storage/browser/quota/quota_task.h"
  19 #include "storage/browser/quota/special_storage_policy.h"
  20 #include "storage/browser/storage_browser_export.h"
  21 #include "storage/common/quota/quota_types.h"
  22 #include "url/gurl.h"
  23
  24 namespace storage {
  25
  26 class ClientUsageTracker;
  27 class StorageMonitor;
  28
  29 // A helper class that gathers and tracks the amount of data stored in
  30 // all quota clients.
  31 // An instance of this class is created per storage type.
  32 class STORAGE_EXPORT UsageTracker : public QuotaTaskObserver {
  33  public:
  34   UsageTracker(const QuotaClientList& clients, StorageType type,
  35                SpecialStoragePolicy* special_storage_policy,
  36                StorageMonitor* storage_monitor);
  37   ~UsageTracker() override;
  38
  39   StorageType type() const { return type_; }
  40   ClientUsageTracker* GetClientTracker(QuotaClient::ID client_id);
  41
  42   void GetGlobalLimitedUsage(const UsageCallback& callback);
  43   void GetGlobalUsage(const GlobalUsageCallback& callback);
  44   void GetHostUsage(const std::string& host, const UsageCallback& callback);
  45   void UpdateUsageCache(QuotaClient::ID client_id,
  46                         const GURL& origin,
  47                         int64 delta);
  48   void GetCachedHostsUsage(std::map<std::string, int64>* host_usage) const;
  49   void GetCachedOrigins(std::set<GURL>* origins) const;
  50   bool IsWorking() const {
  51     return global_usage_callbacks_.HasCallbacks() ||
  52            host_usage_callbacks_.HasAnyCallbacks();
  53   }
  54
  55   void SetUsageCacheEnabled(QuotaClient::ID client_id,
  56                             const GURL& origin,
  57                             bool enabled);
  58
  59  private:
  60   struct AccumulateInfo {
  61     AccumulateInfo() : pending_clients(0), usage(0), unlimited_usage(0) {}
  62     int pending_clients;
  63     int64 usage;
  64     int64 unlimited_usage;
  65   };
  66
  67   typedef std::map<QuotaClient::ID, ClientUsageTracker*> ClientTrackerMap;
  68
  69   typedef CallbackQueue<UsageCallback, int64> UsageCallbackQueue;
  70   typedef CallbackQueue<GlobalUsageCallback, int64, int64>
  71       GlobalUsageCallbackQueue;
  72   typedef CallbackQueueMap<UsageCallback, std::string, int64>
  73       HostUsageCallbackMap;
  74
  75   friend class ClientUsageTracker;
  76   void AccumulateClientGlobalLimitedUsage(AccumulateInfo* info,
  77                                           int64 limited_usage);
  78   void AccumulateClientGlobalUsage(AccumulateInfo* info,
  79                                    int64 usage,
  80                                    int64 unlimited_usage);
  81   void AccumulateClientHostUsage(AccumulateInfo* info,
  82                                  const std::string& host,
  83                                  int64 usage);
  84
  85   const StorageType type_;
  86   ClientTrackerMap client_tracker_map_;
  87
  88   UsageCallbackQueue global_limited_usage_callbacks_;
  89   GlobalUsageCallbackQueue global_usage_callbacks_;
  90   HostUsageCallbackMap host_usage_callbacks_;
  91
  92   StorageMonitor* storage_monitor_;
  93
  94   base::WeakPtrFactory<UsageTracker> weak_factory_;
  95   DISALLOW_COPY_AND_ASSIGN(UsageTracker);
  96 };
  97
  98 }  // namespace storage
  99
 100 #endif  // STORAGE_BROWSER_QUOTA_USAGE_TRACKER_H_