1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
// Copyright 2018 The Chromium Authors
// 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/functional/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "base/synchronization/waitable_event.h"
#include "components/bookmarks/browser/bookmark_client.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:
// Invoked when ModelLoader completes loading.
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).
// `local_or_syncable_file_path` must be non-empty and represents the
// main (non-account) bookmarks, whereas `account_file_path` may be empty.
static scoped_refptr<ModelLoader> Create(
const base::FilePath& local_or_syncable_file_path,
const base::FilePath& account_file_path,
LoadManagedNodeCallback load_managed_node_callback,
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();
}
// Test-only factory function that creates a ModelLoader() that is initially
// loaded.
static scoped_refptr<ModelLoader> CreateForTest(
LoadManagedNodeCallback load_managed_node_callback,
BookmarkLoadDetails* details);
private:
friend class base::RefCountedThreadSafe<ModelLoader>;
ModelLoader();
~ModelLoader();
// Performs the load on a background thread.
std::unique_ptr<BookmarkLoadDetails> DoLoadOnBackgroundThread(
const base::FilePath& local_or_syncable_file_path,
const base::FilePath& account_file_path,
LoadManagedNodeCallback load_managed_node_callback);
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_
|
