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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 <string> | 8 #include <string> |
9 | 9 |
10 #include "base/basictypes.h" | |
11 #include "base/logging.h" | 10 #include "base/logging.h" |
12 #include "media/base/media_export.h" | 11 #include "media/base/media_export.h" |
13 #include "media/base/media_keys.h" | 12 #include "media/base/media_keys.h" |
14 | 13 |
15 namespace media { | 14 namespace media { |
16 | 15 |
17 // Interface for promises being resolved/rejected in response to various | 16 // Interface for promises being resolved/rejected in response to various |
18 // session actions. These may be called synchronously or asynchronously. | 17 // session actions. These may be called synchronously or asynchronously. |
19 // The promise must be resolved or rejected exactly once. It is expected that | 18 // The promise must be resolved or rejected exactly once. It is expected that |
20 // the caller free the promise once it is resolved/rejected. | 19 // the caller free the promise once it is resolved/rejected. |
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38 }; | 37 }; |
39 | 38 |
40 CdmPromise(); | 39 CdmPromise(); |
41 virtual ~CdmPromise(); | 40 virtual ~CdmPromise(); |
42 | 41 |
43 // Used to indicate that the operation failed. |exception_code| must be | 42 // Used to indicate that the operation failed. |exception_code| must be |
44 // specified. |system_code| is a Key System-specific value for the error | 43 // specified. |system_code| is a Key System-specific value for the error |
45 // that occurred, or 0 if there is no associated status code or such status | 44 // that occurred, or 0 if there is no associated status code or such status |
46 // codes are not supported by the Key System. |error_message| is optional. | 45 // codes are not supported by the Key System. |error_message| is optional. |
47 virtual void reject(MediaKeys::Exception exception_code, | 46 virtual void reject(MediaKeys::Exception exception_code, |
48 uint32 system_code, | 47 uint32_t system_code, |
49 const std::string& error_message) = 0; | 48 const std::string& error_message) = 0; |
50 | 49 |
51 // Used to determine the template type of CdmPromiseTemplate<T> so that | 50 // Used to determine the template type of CdmPromiseTemplate<T> so that |
52 // saved CdmPromise objects can be cast to the correct templated version. | 51 // saved CdmPromise objects can be cast to the correct templated version. |
53 virtual ResolveParameterType GetResolveParameterType() const = 0; | 52 virtual ResolveParameterType GetResolveParameterType() const = 0; |
54 | 53 |
55 private: | 54 private: |
56 DISALLOW_COPY_AND_ASSIGN(CdmPromise); | 55 DISALLOW_COPY_AND_ASSIGN(CdmPromise); |
57 }; | 56 }; |
58 | 57 |
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82 class MEDIA_EXPORT CdmPromiseTemplate : public CdmPromise { | 81 class MEDIA_EXPORT CdmPromiseTemplate : public CdmPromise { |
83 public: | 82 public: |
84 CdmPromiseTemplate() : is_settled_(false) {} | 83 CdmPromiseTemplate() : is_settled_(false) {} |
85 | 84 |
86 virtual ~CdmPromiseTemplate() { DCHECK(is_settled_); } | 85 virtual ~CdmPromiseTemplate() { DCHECK(is_settled_); } |
87 | 86 |
88 virtual void resolve(const T&... result) = 0; | 87 virtual void resolve(const T&... result) = 0; |
89 | 88 |
90 // CdmPromise implementation. | 89 // CdmPromise implementation. |
91 virtual void reject(MediaKeys::Exception exception_code, | 90 virtual void reject(MediaKeys::Exception exception_code, |
92 uint32 system_code, | 91 uint32_t system_code, |
93 const std::string& error_message) = 0; | 92 const std::string& error_message) = 0; |
94 | 93 |
95 ResolveParameterType GetResolveParameterType() const override { | 94 ResolveParameterType GetResolveParameterType() const override { |
96 return CdmPromiseTraits<T...>::kType; | 95 return CdmPromiseTraits<T...>::kType; |
97 } | 96 } |
98 | 97 |
99 protected: | 98 protected: |
100 // All implementations must call this method in resolve() and reject() methods | 99 // All implementations must call this method in resolve() and reject() methods |
101 // to indicate that the promise has been settled. | 100 // to indicate that the promise has been settled. |
102 void MarkPromiseSettled() { | 101 void MarkPromiseSettled() { |
103 // Promise can only be settled once. | 102 // Promise can only be settled once. |
104 DCHECK(!is_settled_); | 103 DCHECK(!is_settled_); |
105 is_settled_ = true; | 104 is_settled_ = true; |
106 } | 105 } |
107 | 106 |
108 private: | 107 private: |
109 // Keep track of whether the promise has been resolved or rejected yet. | 108 // Keep track of whether the promise has been resolved or rejected yet. |
110 bool is_settled_; | 109 bool is_settled_; |
111 | 110 |
112 DISALLOW_COPY_AND_ASSIGN(CdmPromiseTemplate); | 111 DISALLOW_COPY_AND_ASSIGN(CdmPromiseTemplate); |
113 }; | 112 }; |
114 | 113 |
115 } // namespace media | 114 } // namespace media |
116 | 115 |
117 #endif // MEDIA_BASE_CDM_PROMISE_H_ | 116 #endif // MEDIA_BASE_CDM_PROMISE_H_ |
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