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Side by Side Diff: content/browser/indexed_db/indexed_db_active_blob_registry.h

Issue 18023022: Blob support for IDB [Chromium] (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Handle the rest of Josh's feedback. Created 7 years ago
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1 // Copyright (c) 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_ACTIVE_BLOB_REGISTRY_H_
6 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_ACTIVE_BLOB_REGISTRY_H_
7
8 #include <map>
9 #include <set>
10 #include <utility>
11 #include "base/basictypes.h"
12 #include "base/files/file_path.h"
13 #include "base/memory/weak_ptr.h"
14 #include "webkit/common/blob/shareable_file_reference.h"
15
16 namespace content {
17
18 class IndexedDBBackingStore;
19
20 class IndexedDBActiveBlobRegistry {
21 public:
22 IndexedDBActiveBlobRegistry(IndexedDBBackingStore* backing_store);
23 ~IndexedDBActiveBlobRegistry();
24
25 // Most methods of this class, and the closure returned by
26 // GetAddBlobRefCallback, should only be called on the backing_store's task
27 // runner. The exception is the closure returned by GetFinalReleaseCallback,
28 // which just calls ReleaseBlobRefThreadSafe.
29
30 // Use DatabaseMetaDataKey::AllBlobsKey for "the whole database".
31 bool MarkDeletedCheckIfUsed(int64 database_id, int64 blob_key);
32
33 webkit_blob::ShareableFileReference::FinalReleaseCallback
34 GetFinalReleaseCallback(int64 database_id, int64 blob_key);
35 // This closure holds a raw pointer to the IndexedDBActiveBlobRegistry,
36 // and may not be called after it is deleted.
37 base::Closure GetAddBlobRefCallback(int64 database_id, int64 blob_key);
38 // Call this to force the registry to drop its reference to the backing store.
39 // This will also turn any outstanding callbacks into no-ops.
40 void ForceShutdown();
41
42 private:
43 void AddBlobRef(int64 database_id, int64 blob_key);
44 void ReleaseBlobRef(int64 database_id, int64 blob_key);
45 static void ReleaseBlobRefThreadSafe(
46 scoped_refptr<base::TaskRunner> task_runner,
47 base::WeakPtr<IndexedDBActiveBlobRegistry> weak_ptr,
48 int64 database_id,
49 int64 blob_key,
50 const base::FilePath& unused);
51
52 // Maps blob_key -> IsDeleted; if the record's absent, it's not in active use
53 // and we don't care if it's deleted.
54 typedef std::map<int64, bool> SingleDBMap;
55 // Maps DB ID -> SingleDBMap
56 typedef std::map<int64, SingleDBMap> AllDBsMap;
57 typedef std::set<int64> DeletedDBSet;
58
59 AllDBsMap use_tracker_;
60 DeletedDBSet deleted_dbs_;
61 // As long as we've got blobs registered in use_tracker_,
62 // backing_store_->factory() will keep backing_store_ alive for us. And
63 // backing_store_ owns us, so we'll stay alive as long as we're needed.
64 IndexedDBBackingStore* backing_store_;
65 base::WeakPtrFactory<IndexedDBActiveBlobRegistry> weak_factory_;
66
67 DISALLOW_COPY_AND_ASSIGN(IndexedDBActiveBlobRegistry);
68 };
69
70 } // namespace content
71
72 #endif // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_ACTIVE_BLOB_REGISTRY_H_
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