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#include <erebos/frp.h>
#include <condition_variable>
#include <mutex>
using namespace erebos;
using std::condition_variable;
using std::move;
using std::mutex;
using std::nullopt;
using std::unique_lock;
mutex bhvTimeMutex;
condition_variable bhvTimeCond;
bool bhvTimeRunning = false;
uint64_t bhvTimeLast = 0;
BhvTime::BhvTime(const BhvCurTime & ct):
BhvTime(ct.time())
{}
BhvCurTime::BhvCurTime()
{
unique_lock lock(bhvTimeMutex);
bhvTimeCond.wait(lock, []{ return !bhvTimeRunning; });
bhvTimeRunning = true;
t = BhvTime(++bhvTimeLast);
}
BhvCurTime::~BhvCurTime()
{
if (t) {
unique_lock lock(bhvTimeMutex);
bhvTimeRunning = false;
lock.unlock();
bhvTimeCond.notify_one();
}
}
BhvCurTime::BhvCurTime(BhvCurTime && other)
{
t = other.t;
other.t = nullopt;
}
BhvCurTime & BhvCurTime::operator=(BhvCurTime && other)
{
t = other.t;
other.t = nullopt;
return *this;
}
BhvImplBase::~BhvImplBase() = default;
void BhvImplBase::dependsOn(shared_ptr<BhvImplBase> other)
{
depends.push_back(other);
other->rdepends.push_back(shared_from_this());
}
void BhvImplBase::updated(const BhvCurTime & ctime)
{
vector<shared_ptr<BhvImplBase>> toUpdate;
markDirty(ctime, toUpdate);
for (auto & bhv : toUpdate)
bhv->updateDirty(ctime);
}
void BhvImplBase::markDirty(const BhvCurTime & ctime, vector<shared_ptr<BhvImplBase>> & toUpdate)
{
if (dirty)
return;
if (!needsUpdate(ctime))
return;
dirty = true;
toUpdate.push_back(shared_from_this());
bool prune = false;
for (const auto & w : rdepends) {
if (auto b = w.lock())
b->markDirty(ctime, toUpdate);
else
prune = true;
}
if (prune) {
decltype(rdepends) pruned;
for (const auto & w : rdepends)
if (!w.expired())
pruned.push_back(move(w));
rdepends = move(pruned);
}
}
void BhvImplBase::updateDirty(const BhvCurTime & ctime)
{
if (!dirty)
return;
for (auto & d : depends)
d->updateDirty(ctime);
doUpdate(ctime);
dirty = false;
bool prune = false;
for (const auto & wcb : watchers) {
if (auto cb = wcb.lock())
(*cb)(ctime);
else
prune = true;
}
if (prune) {
decltype(watchers) pruned;
for (const auto & w : watchers)
if (!w.expired())
pruned.push_back(move(w));
watchers = move(pruned);
}
}
bool BhvImplBase::needsUpdate(const BhvCurTime &) const
{
return true;
}
void BhvImplBase::doUpdate(const BhvCurTime &)
{
}
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