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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 MEDIA_BASE_CDM_PROMISE_H_ | 5 #ifndef MEDIA_BASE_CDM_PROMISE_H_ |
| 6 #define MEDIA_BASE_CDM_PROMISE_H_ | 6 #define MEDIA_BASE_CDM_PROMISE_H_ |
| 7 | 7 |
| 8 #include <stdint.h> | 8 #include <stdint.h> |
| 9 | 9 |
| 10 #include <string> | 10 #include <string> |
| (...skipping 14 matching lines...) Expand all Loading... |
| 25 // a generic class for promises is available, this could be changed to use the | 25 // a generic class for promises is available, this could be changed to use the |
| 26 // generic class as long as the parameters to reject() can be set appropriately. | 26 // generic class as long as the parameters to reject() can be set appropriately. |
| 27 | 27 |
| 28 // The base class only has a reject() method and GetResolveParameterType() that | 28 // The base class only has a reject() method and GetResolveParameterType() that |
| 29 // indicates the type of CdmPromiseTemplate. CdmPromiseTemplate<T> adds the | 29 // indicates the type of CdmPromiseTemplate. CdmPromiseTemplate<T> adds the |
| 30 // resolve(T) method that is dependent on the type of promise. This base class | 30 // resolve(T) method that is dependent on the type of promise. This base class |
| 31 // is specified so that the promises can be easily saved before passing across | 31 // is specified so that the promises can be easily saved before passing across |
| 32 // the pepper interface. | 32 // the pepper interface. |
| 33 class MEDIA_EXPORT CdmPromise { | 33 class MEDIA_EXPORT CdmPromise { |
| 34 public: | 34 public: |
| 35 // TODO(jrummell): Remove deprecated errors. See |
| 36 // http://crbug.com/570216 |
| 37 enum Exception { |
| 38 NOT_SUPPORTED_ERROR, |
| 39 INVALID_STATE_ERROR, |
| 40 INVALID_ACCESS_ERROR, |
| 41 QUOTA_EXCEEDED_ERROR, |
| 42 UNKNOWN_ERROR, |
| 43 CLIENT_ERROR, |
| 44 OUTPUT_ERROR, |
| 45 EXCEPTION_MAX = OUTPUT_ERROR |
| 46 }; |
| 47 |
| 35 enum ResolveParameterType { | 48 enum ResolveParameterType { |
| 36 VOID_TYPE, | 49 VOID_TYPE, |
| 37 INT_TYPE, | 50 INT_TYPE, |
| 38 STRING_TYPE, | 51 STRING_TYPE, |
| 39 KEY_IDS_VECTOR_TYPE | 52 KEY_IDS_VECTOR_TYPE |
| 40 }; | 53 }; |
| 41 | 54 |
| 42 CdmPromise(); | 55 CdmPromise(); |
| 43 virtual ~CdmPromise(); | 56 virtual ~CdmPromise(); |
| 44 | 57 |
| 45 // Used to indicate that the operation failed. |exception_code| must be | 58 // Used to indicate that the operation failed. |exception_code| must be |
| 46 // specified. |system_code| is a Key System-specific value for the error | 59 // specified. |system_code| is a Key System-specific value for the error |
| 47 // that occurred, or 0 if there is no associated status code or such status | 60 // that occurred, or 0 if there is no associated status code or such status |
| 48 // codes are not supported by the Key System. |error_message| is optional. | 61 // codes are not supported by the Key System. |error_message| is optional. |
| 49 virtual void reject(MediaKeys::Exception exception_code, | 62 virtual void reject(Exception exception_code, |
| 50 uint32_t system_code, | 63 uint32_t system_code, |
| 51 const std::string& error_message) = 0; | 64 const std::string& error_message) = 0; |
| 52 | 65 |
| 53 // Used to determine the template type of CdmPromiseTemplate<T> so that | 66 // Used to determine the template type of CdmPromiseTemplate<T> so that |
| 54 // saved CdmPromise objects can be cast to the correct templated version. | 67 // saved CdmPromise objects can be cast to the correct templated version. |
| 55 virtual ResolveParameterType GetResolveParameterType() const = 0; | 68 virtual ResolveParameterType GetResolveParameterType() const = 0; |
| 56 | 69 |
| 57 private: | 70 private: |
| 58 DISALLOW_COPY_AND_ASSIGN(CdmPromise); | 71 DISALLOW_COPY_AND_ASSIGN(CdmPromise); |
| 59 }; | 72 }; |
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| 83 template <typename... T> | 96 template <typename... T> |
| 84 class MEDIA_EXPORT CdmPromiseTemplate : public CdmPromise { | 97 class MEDIA_EXPORT CdmPromiseTemplate : public CdmPromise { |
| 85 public: | 98 public: |
| 86 CdmPromiseTemplate() : is_settled_(false) {} | 99 CdmPromiseTemplate() : is_settled_(false) {} |
| 87 | 100 |
| 88 virtual ~CdmPromiseTemplate() { DCHECK(is_settled_); } | 101 virtual ~CdmPromiseTemplate() { DCHECK(is_settled_); } |
| 89 | 102 |
| 90 virtual void resolve(const T&... result) = 0; | 103 virtual void resolve(const T&... result) = 0; |
| 91 | 104 |
| 92 // CdmPromise implementation. | 105 // CdmPromise implementation. |
| 93 virtual void reject(MediaKeys::Exception exception_code, | 106 virtual void reject(Exception exception_code, |
| 94 uint32_t system_code, | 107 uint32_t system_code, |
| 95 const std::string& error_message) = 0; | 108 const std::string& error_message) = 0; |
| 96 | 109 |
| 97 ResolveParameterType GetResolveParameterType() const override { | 110 ResolveParameterType GetResolveParameterType() const override { |
| 98 return CdmPromiseTraits<T...>::kType; | 111 return CdmPromiseTraits<T...>::kType; |
| 99 } | 112 } |
| 100 | 113 |
| 101 protected: | 114 protected: |
| 102 bool IsPromiseSettled() const { return is_settled_; } | 115 bool IsPromiseSettled() const { return is_settled_; } |
| 103 | 116 |
| 104 // All implementations must call this method in resolve() and reject() methods | 117 // All implementations must call this method in resolve() and reject() methods |
| 105 // to indicate that the promise has been settled. | 118 // to indicate that the promise has been settled. |
| 106 void MarkPromiseSettled() { | 119 void MarkPromiseSettled() { |
| 107 // Promise can only be settled once. | 120 // Promise can only be settled once. |
| 108 DCHECK(!is_settled_); | 121 DCHECK(!is_settled_); |
| 109 is_settled_ = true; | 122 is_settled_ = true; |
| 110 } | 123 } |
| 111 | 124 |
| 112 // Must be called by the concrete destructor if !IsPromiseSettled(). | 125 // Must be called by the concrete destructor if !IsPromiseSettled(). |
| 113 // Note: We can't call reject() in ~CdmPromise() because reject() is virtual. | 126 // Note: We can't call reject() in ~CdmPromise() because reject() is virtual. |
| 114 void RejectPromiseOnDestruction() { | 127 void RejectPromiseOnDestruction() { |
| 115 DCHECK(!is_settled_); | 128 DCHECK(!is_settled_); |
| 116 std::string message = | 129 std::string message = |
| 117 "Unfulfilled promise rejected automatically during destruction."; | 130 "Unfulfilled promise rejected automatically during destruction."; |
| 118 DVLOG(1) << message; | 131 DVLOG(1) << message; |
| 119 reject(MediaKeys::INVALID_STATE_ERROR, 0, message); | 132 reject(INVALID_STATE_ERROR, 0, message); |
| 120 DCHECK(is_settled_); | 133 DCHECK(is_settled_); |
| 121 } | 134 } |
| 122 | 135 |
| 123 private: | 136 private: |
| 124 // Keep track of whether the promise has been resolved or rejected yet. | 137 // Keep track of whether the promise has been resolved or rejected yet. |
| 125 bool is_settled_; | 138 bool is_settled_; |
| 126 | 139 |
| 127 DISALLOW_COPY_AND_ASSIGN(CdmPromiseTemplate); | 140 DISALLOW_COPY_AND_ASSIGN(CdmPromiseTemplate); |
| 128 }; | 141 }; |
| 129 | 142 |
| 130 } // namespace media | 143 } // namespace media |
| 131 | 144 |
| 132 #endif // MEDIA_BASE_CDM_PROMISE_H_ | 145 #endif // MEDIA_BASE_CDM_PROMISE_H_ |
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