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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROME_BROWSER_CONFLICTS_MODULE_INSPECTOR_WIN_H_ |
| 6 #define CHROME_BROWSER_CONFLICTS_MODULE_INSPECTOR_WIN_H_ |
| 7 |
| 8 #include <memory> |
| 9 #include <queue> |
| 10 |
| 11 #include "base/callback.h" |
| 12 #include "base/macros.h" |
| 13 #include "base/memory/weak_ptr.h" |
| 14 #include "base/task_scheduler/task_traits.h" |
| 15 #include "base/threading/thread_checker.h" |
| 16 #include "chrome/browser/conflicts/module_info_win.h" |
| 17 |
| 18 // This class takes care of inspecting several modules (identified by their |
| 19 // ModuleInfoKey) and returning the result via the OnModuleInspectedCallback on |
| 20 // the SequencedTaskRunner where it was created. |
| 21 // |
| 22 // The inspection of all modules is quite expensive in terms of resources, so it |
| 23 // is done one by one, in a task with a background priority level. If needed, it |
| 24 // is possible to increase the priority level of these tasks by calling |
| 25 // IncreaseInspectionPriority(). |
| 26 // |
| 27 // This class is not thread safe and it enforces safety via a ThreadChecker. |
| 28 class ModuleInspector { |
| 29 public: |
| 30 using OnModuleInspectedCallback = |
| 31 base::Callback<void(const ModuleInfoKey& module_key, |
| 32 std::unique_ptr<ModuleInspectionResult>)>; |
| 33 |
| 34 explicit ModuleInspector( |
| 35 const OnModuleInspectedCallback& on_module_inspected_callback); |
| 36 ~ModuleInspector(); |
| 37 |
| 38 // Adds the module to the queue of modules to inspect. Starts the inspection |
| 39 // process if the |queue_| is empty. |
| 40 void AddModule(const ModuleInfoKey& module_key); |
| 41 |
| 42 // Removes the throttling. |
| 43 void IncreaseInspectionPriority(); |
| 44 |
| 45 private: |
| 46 // Starts inspecting the module at the front of the queue. |
| 47 void StartInspectingModule(); |
| 48 |
| 49 // Called back on the execution context on which the ModuleInspector was |
| 50 // created when a module has finished being inspected. The callback will be |
| 51 // executed and, if the |queue_| is not empty, the next module will be sent |
| 52 // for inspection. |
| 53 void OnInspectionFinished( |
| 54 const ModuleInfoKey& module_key, |
| 55 std::unique_ptr<ModuleInspectionResult> inspection_result); |
| 56 |
| 57 OnModuleInspectedCallback on_module_inspected_callback_; |
| 58 |
| 59 // The modules are put in queue until they are sent for inspection. |
| 60 std::queue<ModuleInfoKey> queue_; |
| 61 |
| 62 // The traits used on the task that inspects the modules. It originally starts |
| 63 // at a BACKGROUND priority, but is changed to USER_VISIBLE when |
| 64 // IncreaseInspectionPriority() is called. |
| 65 base::TaskTraits inspection_task_traits_; |
| 66 |
| 67 // The vector of paths to %env_var%, used to account for differences in |
| 68 // localization and where people keep their files. |
| 69 // e.g. c:\windows vs d:\windows |
| 70 StringMapping path_mapping_; |
| 71 |
| 72 base::ThreadChecker thread_checker_; |
| 73 |
| 74 // Weak pointers are used to safely post the inspection result back to the |
| 75 // ModuleInspector from the task scheduler. |
| 76 base::WeakPtrFactory<ModuleInspector> weak_ptr_factory_; |
| 77 |
| 78 DISALLOW_COPY_AND_ASSIGN(ModuleInspector); |
| 79 }; |
| 80 |
| 81 #endif // CHROME_BROWSER_CONFLICTS_MODULE_INSPECTOR_WIN_H_ |
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