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
|
// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_RENDERER_CLIENT_NAVIGATION_THROTTLER_H_
#define CONTENT_RENDERER_CLIENT_NAVIGATION_THROTTLER_H_
#include <vector>
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/weak_ptr.h"
#include "content/common/content_export.h"
namespace content {
// This class manages client-side navigations by either dispatching them
// instantly or deferring for the duration of a handle issued by
// `DeferNavigations()` being alive.
class CONTENT_EXPORT ClientNavigationThrottler {
public:
ClientNavigationThrottler();
~ClientNavigationThrottler();
// Navigations will be deferred until the returned handle goes out of scope.
base::ScopedClosureRunner DeferNavigations();
// The closure will be invoked synchronously by default, or, in case there
// were calls to `DeferNavigations()` before, deferred until there are no
// pending handles left.
void DispatchOrScheduleNavigation(base::OnceClosure navigation);
private:
void UndeferNavigations();
void DispatchPendingCallbacks();
// Not using base::ScopedClosureRunner below, since we need specific
// firing order, which neither std::vector<> destructor
// nor std::vector::clear() can guarantee.
std::vector<base::OnceClosure> deferred_navigations_;
int defer_counter_ = 0;
base::WeakPtrFactory<ClientNavigationThrottler> weak_factory_{this};
};
} // namespace content
#endif // CONTENT_RENDERER_CLIENT_NAVIGATION_THROTTLER_H_
|
