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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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_CALLBACK_HOLDER_H_ | 5 #ifndef MEDIA_BASE_CALLBACK_HOLDER_H_ |
| 6 #define MEDIA_BASE_CALLBACK_HOLDER_H_ | 6 #define MEDIA_BASE_CALLBACK_HOLDER_H_ |
| 7 | 7 |
| 8 #include "base/bind.h" | 8 #include "base/bind.h" |
| 9 #include "base/bind_to_current_loop.h" |
| 9 #include "base/callback.h" | 10 #include "base/callback.h" |
| 10 #include "base/callback_helpers.h" | 11 #include "base/callback_helpers.h" |
| 11 #include "media/base/bind_to_current_loop.h" | |
| 12 | 12 |
| 13 namespace media { | 13 namespace media { |
| 14 | 14 |
| 15 // A helper class that can hold a callback from being fired. | 15 // A helper class that can hold a callback from being fired. |
| 16 template <typename CB> class CallbackHolder { | 16 template <typename CB> class CallbackHolder { |
| 17 public: | 17 public: |
| 18 CallbackHolder() : hold_(false) {} | 18 CallbackHolder() : hold_(false) {} |
| 19 | 19 |
| 20 ~CallbackHolder() { | 20 ~CallbackHolder() { |
| 21 // Make sure all callbacks are satisfied! | 21 // Make sure all callbacks are satisfied! |
| (...skipping 23 matching lines...) Expand all Loading... |
| 45 if (hold_) | 45 if (hold_) |
| 46 held_cb_ = base::ResetAndReturn(&original_cb_); | 46 held_cb_ = base::ResetAndReturn(&original_cb_); |
| 47 else | 47 else |
| 48 base::ResetAndReturn(&original_cb_).Run(); | 48 base::ResetAndReturn(&original_cb_).Run(); |
| 49 } | 49 } |
| 50 | 50 |
| 51 template <typename A1> void RunOrHold(A1 a1) { | 51 template <typename A1> void RunOrHold(A1 a1) { |
| 52 DCHECK(held_cb_.is_null()); | 52 DCHECK(held_cb_.is_null()); |
| 53 if (hold_) { | 53 if (hold_) { |
| 54 held_cb_ = base::Bind(base::ResetAndReturn(&original_cb_), | 54 held_cb_ = base::Bind(base::ResetAndReturn(&original_cb_), |
| 55 internal::TrampolineForward(a1)); | 55 base::internal::TrampolineForward(a1)); |
| 56 } else { | 56 } else { |
| 57 base::ResetAndReturn(&original_cb_).Run(a1); | 57 base::ResetAndReturn(&original_cb_).Run(a1); |
| 58 } | 58 } |
| 59 } | 59 } |
| 60 | 60 |
| 61 template <typename A1, typename A2> void RunOrHold(A1 a1, A2 a2) { | 61 template <typename A1, typename A2> void RunOrHold(A1 a1, A2 a2) { |
| 62 DCHECK(held_cb_.is_null()); | 62 DCHECK(held_cb_.is_null()); |
| 63 if (hold_) { | 63 if (hold_) { |
| 64 held_cb_ = base::Bind(base::ResetAndReturn(&original_cb_), | 64 held_cb_ = base::Bind(base::ResetAndReturn(&original_cb_), |
| 65 internal::TrampolineForward(a1), | 65 base::internal::TrampolineForward(a1), |
| 66 internal::TrampolineForward(a2)); | 66 base::internal::TrampolineForward(a2)); |
| 67 } else { | 67 } else { |
| 68 base::ResetAndReturn(&original_cb_).Run(a1, a2); | 68 base::ResetAndReturn(&original_cb_).Run(a1, a2); |
| 69 } | 69 } |
| 70 } | 70 } |
| 71 | 71 |
| 72 // Releases and runs the held callback. | 72 // Releases and runs the held callback. |
| 73 void RunHeldCallback() { | 73 void RunHeldCallback() { |
| 74 DCHECK(hold_); | 74 DCHECK(hold_); |
| 75 DCHECK(!held_cb_.is_null()); | 75 DCHECK(!held_cb_.is_null()); |
| 76 hold_ = false; | 76 hold_ = false; |
| 77 base::ResetAndReturn(&held_cb_).Run(); | 77 base::ResetAndReturn(&held_cb_).Run(); |
| 78 } | 78 } |
| 79 | 79 |
| 80 private: | 80 private: |
| 81 bool hold_; | 81 bool hold_; |
| 82 CB original_cb_; | 82 CB original_cb_; |
| 83 base::Closure held_cb_; | 83 base::Closure held_cb_; |
| 84 }; | 84 }; |
| 85 | 85 |
| 86 } // namespace media | 86 } // namespace media |
| 87 | 87 |
| 88 #endif // MEDIA_BASE_CALLBACK_HOLDER_H_ | 88 #endif // MEDIA_BASE_CALLBACK_HOLDER_H_ |
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