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-/* This file is part of Ingen.
- * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
- *
- * Ingen is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2 of the License, or (at your option) any later
- * version.
- *
- * Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef QUEUEDEVENT_H
-#define QUEUEDEVENT_H
-
-#include "Event.hpp"
-
-namespace Ingen {
-
-class QueuedEventSource;
-
-
-/** An Event with a not-time-critical preprocessing stage.
- *
- * These events are events that aren't able to be executed immediately by the
- * Jack thread (because they allocate memory or whatever). They are pushed
- * on to the QueuedEventQueue where they are preprocessed then pushed on
- * to the realtime Event Queue when they are ready.
- *
- * Lookups for these events should go in the pre_process() method, since they are
- * not time critical and shouldn't waste time in the audio thread doing
- * lookups they can do beforehand. (This applies for any expensive operation that
- * could be done before the execute() method).
- *
- * \ingroup engine
- */
-class QueuedEvent : public Event
-{
-public:
- /** Process this event into a realtime-suitable event.
- */
- virtual void pre_process();
-
- virtual void execute(ProcessContext& context);
-
- /** If this event blocks the prepare phase of other slow events */
- bool is_blocking() { return _blocking; }
-
- bool is_prepared() { return _pre_processed; }
-
-protected:
- QueuedEvent(Engine& engine,
- SharedPtr<Responder> responder,
- FrameTime time,
- bool blocking = false,
- QueuedEventSource* source = NULL)
- : Event(engine, responder, time)
- , _pre_processed(false), _blocking(blocking), _source(source)
- {
- if (blocking)
- assert(_source);
- }
-
- // NULL event base (for internal events only!)
- QueuedEvent(Engine& engine)
- : Event(engine, SharedPtr<Responder>(), 0)
- , _pre_processed(false), _blocking(false), _source(NULL)
- {}
-
- bool _pre_processed;
- bool _blocking;
- QueuedEventSource* _source;
-};
-
-
-} // namespace Ingen
-
-#endif // QUEUEDEVENT_H