e3569b6469
This is an update to the surface ArdourFeedback class that is needed to support the new event loop integration method. The various session event callbacks cannot be queued in the surface event loop because that would create a delay between the time such events are fired and the time for writing to clients arrive, due to lws_service() blocking while it waits to read. To solve this issue a helper AbstractUI is created for catching events as soon as possible and issuing a call to lws_cancel_service(). See WebsocketsServer::glib_idle_callback()
78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
/*
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* Copyright (C) 2020 Luciano Iam <oss@lucianoiam.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef _ardour_surface_websockets_feedback_h_
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#define _ardour_surface_websockets_feedback_h_
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#include <boost/shared_ptr.hpp>
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#include <boost/unordered_map.hpp>
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#include <glibmm/threads.h>
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#include "pbd/abstract_ui.h"
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#include "component.h"
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#include "typed_value.h"
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#include "mixer.h"
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namespace ArdourSurface {
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class FeedbackHelperUI : public AbstractUI<BaseUI::BaseRequestObject>
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{
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public:
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FeedbackHelperUI ();
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~FeedbackHelperUI () {};
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protected:
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virtual void do_request (BaseUI::BaseRequestObject*);
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};
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class ArdourFeedback : public SurfaceComponent
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{
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public:
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ArdourFeedback (ArdourSurface::ArdourWebsockets& surface)
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: SurfaceComponent (surface){};
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virtual ~ArdourFeedback (){};
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int start ();
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int stop ();
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void update_all (std::string, TypedValue) const;
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void update_all (std::string, uint32_t, TypedValue) const;
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void update_all (std::string, uint32_t, uint32_t, TypedValue) const;
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void update_all (std::string, uint32_t, uint32_t, uint32_t, TypedValue) const;
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private:
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Glib::Threads::Mutex _client_state_lock;
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PBD::ScopedConnectionList _transport_connections;
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sigc::connection _periodic_connection;
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// Only needed for server event loop integration method 3
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FeedbackHelperUI _helper;
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bool poll () const;
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void observe_transport ();
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void observe_mixer ();
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void observe_strip_plugins (uint32_t, ArdourMixerStrip::PluginMap&);
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};
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} // namespace ArdourSurface
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#endif // _ardour_surface_websockets_feedback_h_
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