| OLD | NEW | 
|---|
| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. | 
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be | 
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. | 
| 4 | 4 | 
| 5 #ifndef CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 5 #ifndef CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 
| 6 #define CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 6 #define CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 
| 7 | 7 | 
| 8 #include <memory> | 8 #include <memory> | 
| 9 #include <utility> | 9 #include <utility> | 
| 10 | 10 | 
| 11 #include "base/callback.h" | 11 #include "base/callback.h" | 
|  | 12 #include "base/macros.h" | 
| 12 #include "base/memory/ptr_util.h" | 13 #include "base/memory/ptr_util.h" | 
| 13 #include "base/move.h" |  | 
| 14 #include "third_party/WebKit/public/platform/WebCallbacks.h" | 14 #include "third_party/WebKit/public/platform/WebCallbacks.h" | 
| 15 | 15 | 
| 16 // A ScopedWebCallbacks is a move-only scoper which helps manage the lifetime of | 16 // A ScopedWebCallbacks is a move-only scoper which helps manage the lifetime of | 
| 17 // a blink::WebCallbacks object. This is particularly useful when you're | 17 // a blink::WebCallbacks object. This is particularly useful when you're | 
| 18 // simultaneously dealing with the following two conditions: | 18 // simultaneously dealing with the following two conditions: | 
| 19 // | 19 // | 
| 20 //   1. Your WebCallbacks implementation requires either onSuccess or onError to | 20 //   1. Your WebCallbacks implementation requires either onSuccess or onError to | 
| 21 //      be called before it's destroyed. This is the case with | 21 //      be called before it's destroyed. This is the case with | 
| 22 //      CallbackPromiseAdapter for example, because its underlying | 22 //      CallbackPromiseAdapter for example, because its underlying | 
| 23 //      ScriptPromiseResolver must be resolved or rejected before destruction. | 23 //      ScriptPromiseResolver must be resolved or rejected before destruction. | 
| (...skipping 36 matching lines...) Expand 10 before | Expand all | Expand 10 after  Loading... | 
| 60 // | 60 // | 
| 61 // If the bound RespondWithSuccess callback actually runs, PassCallbacks() will | 61 // If the bound RespondWithSuccess callback actually runs, PassCallbacks() will | 
| 62 // reliquish ownership of the WebCallbacks object to a temporary scoped_ptr | 62 // reliquish ownership of the WebCallbacks object to a temporary scoped_ptr | 
| 63 // which will be destroyed immediately after onSuccess is called. | 63 // which will be destroyed immediately after onSuccess is called. | 
| 64 // | 64 // | 
| 65 // If the bound RespondWithSuccess callback is instead destroyed first, | 65 // If the bound RespondWithSuccess callback is instead destroyed first, | 
| 66 // the ScopedWebCallbacks destructor will invoke OnCallbacksDropped, executing | 66 // the ScopedWebCallbacks destructor will invoke OnCallbacksDropped, executing | 
| 67 // our desired default behavior before deleting the WebCallbacks. | 67 // our desired default behavior before deleting the WebCallbacks. | 
| 68 template <typename CallbacksType> | 68 template <typename CallbacksType> | 
| 69 class ScopedWebCallbacks { | 69 class ScopedWebCallbacks { | 
| 70   MOVE_ONLY_TYPE_FOR_CPP_03(ScopedWebCallbacks); |  | 
| 71 |  | 
| 72  public: | 70  public: | 
| 73   using DestructionCallback = | 71   using DestructionCallback = | 
| 74       base::Callback<void(std::unique_ptr<CallbacksType> callbacks)>; | 72       base::Callback<void(std::unique_ptr<CallbacksType> callbacks)>; | 
| 75 | 73 | 
| 76   ScopedWebCallbacks(std::unique_ptr<CallbacksType> callbacks, | 74   ScopedWebCallbacks(std::unique_ptr<CallbacksType> callbacks, | 
| 77                      const DestructionCallback& destruction_callback) | 75                      const DestructionCallback& destruction_callback) | 
| 78       : callbacks_(std::move(callbacks)), | 76       : callbacks_(std::move(callbacks)), | 
| 79         destruction_callback_(destruction_callback) {} | 77         destruction_callback_(destruction_callback) {} | 
| 80 | 78 | 
| 81   ~ScopedWebCallbacks() { | 79   ~ScopedWebCallbacks() { | 
| 82     if (callbacks_) | 80     if (callbacks_) | 
| 83       destruction_callback_.Run(std::move(callbacks_)); | 81       destruction_callback_.Run(std::move(callbacks_)); | 
| 84   } | 82   } | 
| 85 | 83 | 
| 86   ScopedWebCallbacks(ScopedWebCallbacks&& other) { *this = std::move(other); } | 84   ScopedWebCallbacks(ScopedWebCallbacks&& other) { *this = std::move(other); } | 
| 87 | 85 | 
| 88   ScopedWebCallbacks& operator=(ScopedWebCallbacks&& other) { | 86   ScopedWebCallbacks& operator=(ScopedWebCallbacks&& other) { | 
| 89     callbacks_ = std::move(other.callbacks_); | 87     callbacks_ = std::move(other.callbacks_); | 
| 90     destruction_callback_ = other.destruction_callback_; | 88     destruction_callback_ = other.destruction_callback_; | 
| 91     return *this; | 89     return *this; | 
| 92   } | 90   } | 
| 93 | 91 | 
| 94   std::unique_ptr<CallbacksType> PassCallbacks() { | 92   std::unique_ptr<CallbacksType> PassCallbacks() { | 
| 95     return std::move(callbacks_); | 93     return std::move(callbacks_); | 
| 96   } | 94   } | 
| 97 | 95 | 
| 98  private: | 96  private: | 
| 99   std::unique_ptr<CallbacksType> callbacks_; | 97   std::unique_ptr<CallbacksType> callbacks_; | 
| 100   DestructionCallback destruction_callback_; | 98   DestructionCallback destruction_callback_; | 
|  | 99 | 
|  | 100   DISALLOW_COPY_AND_ASSIGN(ScopedWebCallbacks); | 
| 101 }; | 101 }; | 
| 102 | 102 | 
| 103 template <typename CallbacksType> | 103 template <typename CallbacksType> | 
| 104 ScopedWebCallbacks<CallbacksType> make_scoped_web_callbacks( | 104 ScopedWebCallbacks<CallbacksType> make_scoped_web_callbacks( | 
| 105     CallbacksType* callbacks, | 105     CallbacksType* callbacks, | 
| 106     const typename ScopedWebCallbacks<CallbacksType>::DestructionCallback& | 106     const typename ScopedWebCallbacks<CallbacksType>::DestructionCallback& | 
| 107         destruction_callback) { | 107         destruction_callback) { | 
| 108   return ScopedWebCallbacks<CallbacksType>(base::WrapUnique(callbacks), | 108   return ScopedWebCallbacks<CallbacksType>(base::WrapUnique(callbacks), | 
| 109                                            destruction_callback); | 109                                            destruction_callback); | 
| 110 } | 110 } | 
| 111 | 111 | 
| 112 #endif  // CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 112 #endif  // CONTENT_CHILD_SCOPED_WEB_CALLBACKS_H_ | 
| OLD | NEW | 
|---|