src/content/browser/indexed_db/indexed_db_active_blob_registry.cc

   1 // Copyright 2014 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 #include "base/bind.h"
   6 #include "base/location.h"
   7 #include "base/stl_util.h"
   8 #include "base/task_runner.h"
   9 #include "content/browser/indexed_db/indexed_db_active_blob_registry.h"
  10 #include "content/browser/indexed_db/indexed_db_backing_store.h"
  11 #include "content/browser/indexed_db/indexed_db_factory.h"
  12 #include "content/browser/indexed_db/indexed_db_leveldb_coding.h"
  13
  14 namespace content {
  15
  16 IndexedDBActiveBlobRegistry::IndexedDBActiveBlobRegistry(
  17     IndexedDBBackingStore* backing_store)
  18     : backing_store_(backing_store), weak_factory_(this) {}
  19
  20 IndexedDBActiveBlobRegistry::~IndexedDBActiveBlobRegistry() {
  21 }
  22
  23 void IndexedDBActiveBlobRegistry::AddBlobRef(int64 database_id,
  24                                              int64 blob_key) {
  25   DCHECK(backing_store_);
  26   DCHECK(backing_store_->task_runner()->RunsTasksOnCurrentThread());
  27   DCHECK(KeyPrefix::IsValidDatabaseId(database_id));
  28   DCHECK(DatabaseMetaDataKey::IsValidBlobKey(blob_key));
  29   DCHECK(!ContainsKey(deleted_dbs_, database_id));
  30   bool need_ref = use_tracker_.empty();
  31   SingleDBMap& single_db_map = use_tracker_[database_id];
  32   SingleDBMap::iterator iter = single_db_map.find(blob_key);
  33   if (iter == single_db_map.end()) {
  34     single_db_map[blob_key] = false;
  35     if (need_ref) {
  36       backing_store_->factory()->ReportOutstandingBlobs(
  37           backing_store_->origin_url(), true);
  38     }
  39   } else {
  40     DCHECK(!need_ref);
  41     DCHECK(!iter->second);  // You can't add a reference once it's been deleted.
  42   }
  43 }
  44
  45 void IndexedDBActiveBlobRegistry::ReleaseBlobRef(int64 database_id,
  46                                                  int64 blob_key) {
  47   DCHECK(backing_store_);
  48   DCHECK(backing_store_->task_runner()->RunsTasksOnCurrentThread());
  49   DCHECK(KeyPrefix::IsValidDatabaseId(database_id));
  50   DCHECK(DatabaseMetaDataKey::IsValidBlobKey(blob_key));
  51   AllDBsMap::iterator db_pair = use_tracker_.find(database_id);
  52   if (db_pair == use_tracker_.end()) {
  53     NOTREACHED();
  54     return;
  55   }
  56   SingleDBMap& single_db = db_pair->second;
  57   SingleDBMap::iterator blob_pair = single_db.find(blob_key);
  58   if (blob_pair == single_db.end()) {
  59     NOTREACHED();
  60     return;
  61   }
  62   bool delete_in_backend = false;
  63   DeletedDBSet::iterator db_to_delete = deleted_dbs_.find(database_id);
  64   bool db_marked_for_deletion = db_to_delete != deleted_dbs_.end();
  65   // Don't bother deleting the file if we're going to delete its whole
  66   // database directory soon.
  67   delete_in_backend = blob_pair->second && !db_marked_for_deletion;
  68   single_db.erase(blob_pair);
  69   if (single_db.empty()) {
  70     use_tracker_.erase(db_pair);
  71     if (db_marked_for_deletion) {
  72       delete_in_backend = true;
  73       blob_key = DatabaseMetaDataKey::kAllBlobsKey;
  74       deleted_dbs_.erase(db_to_delete);
  75     }
  76   }
  77   if (delete_in_backend)
  78     backing_store_->ReportBlobUnused(database_id, blob_key);
  79   if (use_tracker_.empty()) {
  80     backing_store_->factory()->ReportOutstandingBlobs(
  81         backing_store_->origin_url(), false);
  82   }
  83 }
  84
  85 bool IndexedDBActiveBlobRegistry::MarkDeletedCheckIfUsed(int64 database_id,
  86                                                          int64 blob_key) {
  87   DCHECK(backing_store_);
  88   DCHECK(backing_store_->task_runner()->RunsTasksOnCurrentThread());
  89   DCHECK(KeyPrefix::IsValidDatabaseId(database_id));
  90   AllDBsMap::iterator db_pair = use_tracker_.find(database_id);
  91   if (db_pair == use_tracker_.end())
  92     return false;
  93
  94   if (blob_key == DatabaseMetaDataKey::kAllBlobsKey) {
  95     deleted_dbs_.insert(database_id);
  96     return true;
  97   }
  98
  99   SingleDBMap& single_db = db_pair->second;
 100   SingleDBMap::iterator iter = single_db.find(blob_key);
 101   if (iter == single_db.end())
 102     return false;
 103
 104   iter->second = true;
 105   return true;
 106 }
 107
 108 void IndexedDBActiveBlobRegistry::ReleaseBlobRefThreadSafe(
 109     scoped_refptr<base::TaskRunner> task_runner,
 110     base::WeakPtr<IndexedDBActiveBlobRegistry> weak_ptr,
 111     int64 database_id,
 112     int64 blob_key,
 113     const base::FilePath& unused) {
 114   task_runner->PostTask(FROM_HERE,
 115                         base::Bind(&IndexedDBActiveBlobRegistry::ReleaseBlobRef,
 116                                    weak_ptr,
 117                                    database_id,
 118                                    blob_key));
 119 }
 120
 121 storage::ShareableFileReference::FinalReleaseCallback
 122 IndexedDBActiveBlobRegistry::GetFinalReleaseCallback(int64 database_id,
 123                                                      int64 blob_key) {
 124   return base::Bind(
 125       &IndexedDBActiveBlobRegistry::ReleaseBlobRefThreadSafe,
 126       scoped_refptr<base::TaskRunner>(backing_store_->task_runner()),
 127       weak_factory_.GetWeakPtr(),
 128       database_id,
 129       blob_key);
 130 }
 131
 132 base::Closure IndexedDBActiveBlobRegistry::GetAddBlobRefCallback(
 133     int64 database_id,
 134     int64 blob_key) {
 135   return base::Bind(&IndexedDBActiveBlobRegistry::AddBlobRef,
 136                     weak_factory_.GetWeakPtr(),
 137                     database_id,
 138                     blob_key);
 139 }
 140
 141 void IndexedDBActiveBlobRegistry::ForceShutdown() {
 142   weak_factory_.InvalidateWeakPtrs();
 143   use_tracker_.clear();
 144   backing_store_ = NULL;
 145 }
 146
 147 }  // namespace content