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#include "scheduler.h"
#include <util/datetime/base.h>
#include <util/generic/algorithm.h>
#include <util/generic/yexception.h>
//#include "dummy_debugger.h"
using namespace NBus;
using namespace NBus::NPrivate;
class TScheduleDeadlineCompare {
public:
bool operator()(const IScheduleItemAutoPtr& i1, const IScheduleItemAutoPtr& i2) const noexcept {
return i1->GetScheduleTime() > i2->GetScheduleTime();
}
};
TScheduler::TScheduler()
: StopThread(false)
, Thread([&] { this->SchedulerThread(); })
{
}
TScheduler::~TScheduler() {
Y_VERIFY(StopThread, "state check");
}
size_t TScheduler::Size() const {
TGuard<TLock> guard(Lock);
return Items.size() + (!!NextItem ? 1 : 0);
}
void TScheduler::Stop() {
{
TGuard<TLock> guard(Lock);
Y_VERIFY(!StopThread, "Scheduler already stopped");
StopThread = true;
CondVar.Signal();
}
Thread.Get();
if (!!NextItem) {
NextItem.Destroy();
}
for (auto& item : Items) {
item.Destroy();
}
}
void TScheduler::Schedule(TAutoPtr<IScheduleItem> i) {
TGuard<TLock> lock(Lock);
if (StopThread)
return;
if (!!NextItem) {
if (i->GetScheduleTime() < NextItem->GetScheduleTime()) {
DoSwap(i, NextItem);
}
}
Items.push_back(i);
PushHeap(Items.begin(), Items.end(), TScheduleDeadlineCompare());
FillNextItem();
CondVar.Signal();
}
void TScheduler::FillNextItem() {
if (!NextItem && !Items.empty()) {
PopHeap(Items.begin(), Items.end(), TScheduleDeadlineCompare());
NextItem = Items.back();
Items.erase(Items.end() - 1);
}
}
void TScheduler::SchedulerThread() {
for (;;) {
IScheduleItemAutoPtr current;
{
TGuard<TLock> guard(Lock);
if (StopThread) {
break;
}
if (!!NextItem) {
CondVar.WaitD(Lock, NextItem->GetScheduleTime());
} else {
CondVar.WaitI(Lock);
}
if (StopThread) {
break;
}
// signal comes if either scheduler is to be stopped of there's work to do
Y_VERIFY(!!NextItem, "state check");
if (TInstant::Now() < NextItem->GetScheduleTime()) {
// NextItem is updated since WaitD
continue;
}
current = NextItem.Release();
}
current->Do();
current.Destroy();
{
TGuard<TLock> guard(Lock);
FillNextItem();
}
}
}
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