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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/macros.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& profile_path,
std::unique_ptr<BookmarkLoadDetails> details,
LoadCallback callback);
// 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& profile_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_;
DISALLOW_COPY_AND_ASSIGN(ModelLoader);
};
} // namespace bookmarks
#endif // COMPONENTS_BOOKMARKS_BROWSER_MODEL_LOADER_H_
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