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- // Copyright 2018 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 COMPONENTS_BOOKMARKS_BROWSER_MODEL_LOADER_H_
- #define COMPONENTS_BOOKMARKS_BROWSER_MODEL_LOADER_H_
- #include <memory>
- #include "base/callback_forward.h"
- #include "base/memory/ref_counted.h"
- #include "base/memory/scoped_refptr.h"
- #include "base/synchronization/waitable_event.h"
- namespace base {
- class FilePath;
- class SequencedTaskRunner;
- } // namespace base
- namespace bookmarks {
- class BookmarkLoadDetails;
- class HistoryBookmarkModel;
- // ModelLoader is created by BookmarkModel to track loading of BookmarkModel.
- // ModelLoader may be used on multiple threads. ModelLoader may outlive
- // BookmarkModel.
- class ModelLoader : public base::RefCountedThreadSafe<ModelLoader> {
- public:
- using LoadCallback =
- base::OnceCallback<void(std::unique_ptr<BookmarkLoadDetails>)>;
- // Creates the ModelLoader, and schedules loading on a backend task runner.
- // |callback| is run once loading completes (on the main thread).
- static scoped_refptr<ModelLoader> Create(
- const base::FilePath& file_path,
- std::unique_ptr<BookmarkLoadDetails> details,
- LoadCallback callback);
- ModelLoader(const ModelLoader&) = delete;
- ModelLoader& operator=(const ModelLoader&) = delete;
- // Blocks until loaded. This is intended for usage on a thread other than
- // the main thread.
- void BlockTillLoaded();
- // Returns null until the model has loaded. Use BlockTillLoaded() to ensure
- // this returns non-null.
- HistoryBookmarkModel* history_bookmark_model() {
- return history_bookmark_model_.get();
- }
- private:
- friend class base::RefCountedThreadSafe<ModelLoader>;
- ModelLoader();
- ~ModelLoader();
- // Performs the load on a background thread.
- std::unique_ptr<BookmarkLoadDetails> DoLoadOnBackgroundThread(
- const base::FilePath& file_path,
- std::unique_ptr<BookmarkLoadDetails> details);
- scoped_refptr<base::SequencedTaskRunner> backend_task_runner_;
- scoped_refptr<HistoryBookmarkModel> history_bookmark_model_;
- // Signaled once loading completes.
- base::WaitableEvent loaded_signal_;
- };
- } // namespace bookmarks
- #endif // COMPONENTS_BOOKMARKS_BROWSER_MODEL_LOADER_H_
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