StateChangeDistributor.cc

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#include "StateChangeDistributor.hh"
#include "StateChangeListener.hh"
#include "StateChange.hh"
#include "stl.hh"
#include <cassert>

namespace openmsx {

StateChangeDistributor::~StateChangeDistributor()
{
        assert(listeners.empty());
}

bool StateChangeDistributor::isRegistered(StateChangeListener* listener) const
{
        return contains(listeners, listener);
}

void StateChangeDistributor::registerListener(StateChangeListener& listener)
{
        assert(!isRegistered(&listener));
        listeners.push_back(&listener);
}

void StateChangeDistributor::unregisterListener(StateChangeListener& listener)
{
        move_pop_back(listeners, rfind_unguarded(listeners, &listener));
}

void StateChangeDistributor::registerRecorder(StateChangeRecorder& recorder_)
{
        assert(!recorder);
        recorder = &recorder_;
}

void StateChangeDistributor::unregisterRecorder(StateChangeRecorder& recorder_)
{
        (void)recorder_;
        assert(recorder == &recorder_);
        recorder = nullptr;
}

void StateChangeDistributor::distributeNew(const EventPtr& event)
{
        if (viewOnlyMode && isReplaying()) return;

        if (isReplaying()) {
                stopReplay(event->getTime());
        }
        distribute(event);
}

void StateChangeDistributor::distributeReplay(const EventPtr& event)
{
        assert(isReplaying());
        distribute(event);
}

void StateChangeDistributor::distribute(const EventPtr& event)
{
        // Iterate over a copy because signalStateChange() may indirect call
        // back into registerListener().
        //   e.g. signalStateChange() -> .. -> PlugCmd::execute() -> .. ->
        //        Connector::plug() -> .. -> Joystick::plugHelper() ->
        //        registerListener()
        if (recorder) recorder->signalStateChange(event);
        auto copy = listeners;
        for (auto& l : copy) {
                if (isRegistered(l)) {
                        // it's possible the listener unregistered itself
                        // (but is still present in the copy)
                        l->signalStateChange(event);
                }
        }
}

void StateChangeDistributor::stopReplay(EmuTime::param time)
{
        if (!isReplaying()) return;

        if (recorder) recorder->stopReplay(time);
        for (auto& l : listeners) {
                l->stopReplay(time);
        }
}

bool StateChangeDistributor::isReplaying() const
{
        if (recorder) {
                return recorder->isReplaying();
        }
        return false;
}

} // namespace openmsx