src/webkit/browser/quota/quota_temporary_storage_evictor.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 WEBKIT_BROWSER_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_
   6 #define WEBKIT_BROWSER_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/threading/non_thread_safe.h"
  13 #include "base/timer/timer.h"
  14 #include "webkit/browser/webkit_storage_browser_export.h"
  15 #include "webkit/common/quota/quota_types.h"
  16
  17 class GURL;
  18
  19 namespace content {
  20 class QuotaTemporaryStorageEvictorTest;
  21 }
  22
  23 namespace quota {
  24
  25 class QuotaEvictionHandler;
  26 struct UsageAndQuota;
  27
  28 class WEBKIT_STORAGE_BROWSER_EXPORT_PRIVATE QuotaTemporaryStorageEvictor
  29     : public base::NonThreadSafe {
  30  public:
  31   struct Statistics {
  32     Statistics()
  33         : num_errors_on_evicting_origin(0),
  34           num_errors_on_getting_usage_and_quota(0),
  35           num_evicted_origins(0),
  36           num_eviction_rounds(0),
  37           num_skipped_eviction_rounds(0) {}
  38     int64 num_errors_on_evicting_origin;
  39     int64 num_errors_on_getting_usage_and_quota;
  40     int64 num_evicted_origins;
  41     int64 num_eviction_rounds;
  42     int64 num_skipped_eviction_rounds;
  43
  44     void subtract_assign(const Statistics& rhs) {
  45       num_errors_on_evicting_origin -= rhs.num_errors_on_evicting_origin;
  46       num_errors_on_getting_usage_and_quota -=
  47           rhs.num_errors_on_getting_usage_and_quota;
  48       num_evicted_origins -= rhs.num_evicted_origins;
  49       num_eviction_rounds -= rhs.num_eviction_rounds;
  50       num_skipped_eviction_rounds -= rhs.num_skipped_eviction_rounds;
  51     }
  52   };
  53
  54   struct EvictionRoundStatistics {
  55     EvictionRoundStatistics();
  56
  57     bool in_round;
  58     bool is_initialized;
  59
  60     base::Time start_time;
  61     int64 usage_overage_at_round;
  62     int64 diskspace_shortage_at_round;
  63
  64     int64 usage_on_beginning_of_round;
  65     int64 usage_on_end_of_round;
  66     int64 num_evicted_origins_in_round;
  67   };
  68
  69   QuotaTemporaryStorageEvictor(
  70       QuotaEvictionHandler* quota_eviction_handler,
  71       int64 interval_ms);
  72   virtual ~QuotaTemporaryStorageEvictor();
  73
  74   void GetStatistics(std::map<std::string, int64>* statistics);
  75   void ReportPerRoundHistogram();
  76   void ReportPerHourHistogram();
  77   void Start();
  78
  79   int64 min_available_disk_space_to_start_eviction() {
  80     return min_available_disk_space_to_start_eviction_;
  81   }
  82   void reset_min_available_disk_space_to_start_eviction() {
  83     min_available_disk_space_to_start_eviction_ =
  84         kMinAvailableDiskSpaceToStartEvictionNotSpecified;
  85   }
  86   void set_min_available_disk_space_to_start_eviction(int64 value) {
  87     min_available_disk_space_to_start_eviction_ = value;
  88   }
  89
  90  private:
  91   friend class content::QuotaTemporaryStorageEvictorTest;
  92
  93   void StartEvictionTimerWithDelay(int delay_ms);
  94   void ConsiderEviction();
  95   void OnGotUsageAndQuotaForEviction(
  96       QuotaStatusCode status,
  97       const UsageAndQuota& quota_and_usage);
  98   void OnGotLRUOrigin(const GURL& origin);
  99   void OnEvictionComplete(QuotaStatusCode status);
 100
 101   void OnEvictionRoundStarted();
 102   void OnEvictionRoundFinished();
 103
 104   // This is only used for tests.
 105   void set_repeated_eviction(bool repeated_eviction) {
 106     repeated_eviction_ = repeated_eviction;
 107   }
 108
 109   static const int kMinAvailableDiskSpaceToStartEvictionNotSpecified;
 110
 111   int64 min_available_disk_space_to_start_eviction_;
 112
 113   // Not owned; quota_eviction_handler owns us.
 114   QuotaEvictionHandler* quota_eviction_handler_;
 115
 116   Statistics statistics_;
 117   Statistics previous_statistics_;
 118   EvictionRoundStatistics round_statistics_;
 119   base::Time time_of_end_of_last_nonskipped_round_;
 120   base::Time time_of_end_of_last_round_;
 121
 122   int64 interval_ms_;
 123   bool repeated_eviction_;
 124
 125   base::OneShotTimer<QuotaTemporaryStorageEvictor> eviction_timer_;
 126   base::RepeatingTimer<QuotaTemporaryStorageEvictor> histogram_timer_;
 127   base::WeakPtrFactory<QuotaTemporaryStorageEvictor> weak_factory_;
 128
 129   DISALLOW_COPY_AND_ASSIGN(QuotaTemporaryStorageEvictor);
 130 };
 131
 132 }  // namespace quota
 133
 134 #endif  // WEBKIT_BROWSER_QUOTA_QUOTA_TEMPORARY_STORAGE_EVICTOR_H_