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
|
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UPGRADE_DETECTOR_INSTALLED_VERSION_MONITOR_H_
#define CHROME_BROWSER_UPGRADE_DETECTOR_INSTALLED_VERSION_MONITOR_H_
#include <memory>
#include "base/functional/callback_forward.h"
// An abstract base for an object that monitors the browser's installation for
// updates.
class InstalledVersionMonitor {
public:
// A callback run to indicate either a monitored change or an error. The
// single boolean argument is true in case of error, or false in case of a
// change.
using Callback = base::RepeatingCallback<void(bool)>;
// Returns a new instance.
static std::unique_ptr<InstalledVersionMonitor> Create();
InstalledVersionMonitor(const InstalledVersionMonitor&) = delete;
InstalledVersionMonitor& operator=(const InstalledVersionMonitor&) = delete;
virtual ~InstalledVersionMonitor() = default;
// Starts the monitor; may only be called once per instance. |callback| will
// be run zero or more times with a false argument to report changes in the
// installation, and at most one time with a true argument to report an error.
// In case of error, no further notifications will be made. There is no
// guarantee that |callback| will not be run after this instance is destroyed.
virtual void Start(Callback callback) = 0;
protected:
InstalledVersionMonitor() = default;
};
#endif // CHROME_BROWSER_UPGRADE_DETECTOR_INSTALLED_VERSION_MONITOR_H_
|
