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// Copyright 2014 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_ACTIVE_BLOB_REGISTRY_H_
#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_ACTIVE_BLOB_REGISTRY_H_
#include <map>
#include <set>
#include <utility>
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "content/common/content_export.h"
#include "storage/common/blob/shareable_file_reference.h"
namespace content {
class IndexedDBBackingStore;
class CONTENT_EXPORT IndexedDBActiveBlobRegistry {
public:
explicit IndexedDBActiveBlobRegistry(IndexedDBBackingStore* backing_store);
~IndexedDBActiveBlobRegistry();
// Most methods of this class, and the closure returned by
// GetAddBlobRefCallback, should only be called on the backing_store's task
// runner. The exception is the closure returned by GetFinalReleaseCallback,
// which just calls ReleaseBlobRefThreadSafe.
// Use DatabaseMetaDataKey::AllBlobsKey for "the whole database".
bool MarkDeletedCheckIfUsed(int64 database_id, int64 blob_key);
storage::ShareableFileReference::FinalReleaseCallback GetFinalReleaseCallback(
int64 database_id,
int64 blob_key);
// This closure holds a raw pointer to the IndexedDBActiveBlobRegistry,
// and may not be called after it is deleted.
base::Closure GetAddBlobRefCallback(int64 database_id, int64 blob_key);
// Call this to force the registry to drop its use counts, permitting the
// factory to drop any blob-related refcount for the backing store.
// This will also turn any outstanding callbacks into no-ops.
void ForceShutdown();
private:
// Maps blob_key -> IsDeleted; if the record's absent, it's not in active use
// and we don't care if it's deleted.
typedef std::map<int64, bool> SingleDBMap;
// Maps DB ID -> SingleDBMap
typedef std::map<int64, SingleDBMap> AllDBsMap;
typedef std::set<int64> DeletedDBSet;
void AddBlobRef(int64 database_id, int64 blob_key);
void ReleaseBlobRef(int64 database_id, int64 blob_key);
static void ReleaseBlobRefThreadSafe(
scoped_refptr<base::TaskRunner> task_runner,
base::WeakPtr<IndexedDBActiveBlobRegistry> weak_ptr,
int64 database_id,
int64 blob_key,
const base::FilePath& unused);
AllDBsMap use_tracker_;
DeletedDBSet deleted_dbs_;
// As long as we've got blobs registered in use_tracker_,
// backing_store_->factory() will keep backing_store_ alive for us. And
// backing_store_ owns us, so we'll stay alive as long as we're needed.
IndexedDBBackingStore* backing_store_;
base::WeakPtrFactory<IndexedDBActiveBlobRegistry> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(IndexedDBActiveBlobRegistry);
};
} // namespace content
#endif // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_ACTIVE_BLOB_REGISTRY_H_
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