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76 lines
3.4 KiB
C++
76 lines
3.4 KiB
C++
/*****************************************************************************************
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* *
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* OpenSpace *
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* *
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* Copyright (c) 2014-2021 *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this *
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* software and associated documentation files (the "Software"), to deal in the Software *
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* without restriction, including without limitation the rights to use, copy, modify, *
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, and to *
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* permit persons to whom the Software is furnished to do so, subject to the following *
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* conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in all copies *
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* or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, *
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A *
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* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT *
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF *
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE *
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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****************************************************************************************/
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#ifndef __OPENSPACE_CORE___SYNCHRONIZATIONWATCHER___H__
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#define __OPENSPACE_CORE___SYNCHRONIZATIONWATCHER___H__
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#include <openspace/util/resourcesynchronization.h>
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#include <memory>
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#include <mutex>
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#include <vector>
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#include <unordered_map>
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namespace openspace {
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/**
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* Delays callbacks of synchronization state changes to
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* when notify is called.
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*/
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class SynchronizationWatcher {
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public:
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using WatchHandle = size_t;
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struct WatchData {
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std::weak_ptr<ResourceSynchronization> synchronization;
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ResourceSynchronization::CallbackHandle callbackHandle;
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};
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struct NotificationData {
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std::weak_ptr<ResourceSynchronization> synchronization;
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ResourceSynchronization::State state;
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WatchHandle handle;
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ResourceSynchronization::StateChangeCallback callback;
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};
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WatchHandle watchSynchronization(
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std::shared_ptr<ResourceSynchronization> synchronization,
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ResourceSynchronization::StateChangeCallback callback
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);
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void unwatchSynchronization(WatchHandle watchHandle);
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void notify();
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private:
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std::mutex _mutex;
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std::unordered_map<WatchHandle, WatchData> _watchedSyncs;
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std::vector<NotificationData> _pendingNotifications;
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WatchHandle nextWatchHandle = 0;
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};
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} // namespace openspace
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#endif // __OPENSPACE_CORE___SYNCHRONIZATIONWATCHER___H__
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