| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CC_BASE_UNIQUE_NOTIFIER_H_ |
| #define CC_BASE_UNIQUE_NOTIFIER_H_ |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "base/memory/weak_ptr.h" |
| #include "cc/base/cc_export.h" |
| |
| namespace base { |
| class SequencedTaskRunner; |
| } // namespace base |
| |
| namespace cc { |
| |
| class CC_EXPORT UniqueNotifier { |
| public: |
| // Configure this notifier to issue the |closure| notification when scheduled. |
| UniqueNotifier(base::SequencedTaskRunner* task_runner, |
| const base::Closure& closure); |
| |
| // Destroying the notifier will ensure that no further notifications will |
| // happen from this class. |
| ~UniqueNotifier(); |
| |
| // Schedule a notification to be run. If another notification is already |
| // pending, then only one notification will take place. |
| void Schedule(); |
| |
| // Cancel a pending notification, if one was scheduled. |
| void Cancel(); |
| |
| private: |
| void Notify(); |
| |
| // TODO(dcheng): How come this doesn't need to hold a ref to the task runner? |
| base::SequencedTaskRunner* task_runner_; |
| base::Closure closure_; |
| bool notification_pending_; |
| |
| base::WeakPtrFactory<UniqueNotifier> weak_ptr_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(UniqueNotifier); |
| }; |
| |
| } // namespace cc |
| |
| #endif // CC_BASE_UNIQUE_NOTIFIER_H_ |