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#pragma once
#include "fwd.h"
#include <library/cpp/messagebus/actor/actor.h>
#include <library/cpp/messagebus/misc/atomic_box.h>
#include <library/cpp/deprecated/enum_codegen/enum_codegen.h>
#include <util/generic/noncopyable.h>
#include <util/generic/ptr.h>
#include <util/thread/lfstack.h>
namespace NRainCheck {
struct ISubtaskListener {
virtual void SetDone() = 0;
virtual ~ISubtaskListener() {
}
};
struct TNopSubtaskListener: public ISubtaskListener {
void SetDone() override;
static TNopSubtaskListener Instance;
};
class TSubtaskCompletionFunc {
friend class TSubtaskCompletion;
typedef void (ITaskBase::*TFunc)(TSubtaskCompletion*);
TFunc Func;
public:
TSubtaskCompletionFunc()
: Func(nullptr)
{
}
TSubtaskCompletionFunc(void*)
: Func(nullptr)
{
}
template <typename TTask>
TSubtaskCompletionFunc(void (TTask::*func)(TSubtaskCompletion*))
: Func((TFunc)func)
{
static_assert((std::is_base_of<ITaskBase, TTask>::value), "expect (std::is_base_of<ITaskBase, TTask>::value)");
}
bool operator!() const {
return !Func;
}
};
template <typename T>
class TTaskFuture;
#define SUBTASK_STATE_MAP(XX) \
XX(CREATED, "Initial") \
XX(RUNNING, "Running") \
XX(DONE, "Completed") \
XX(CANCEL_REQUESTED, "Cancel requested, but still executing") \
XX(CANCELED, "Canceled") \
/**/
enum ESubtaskState {
SUBTASK_STATE_MAP(ENUM_VALUE_GEN_NO_VALUE)
};
ENUM_TO_STRING(ESubtaskState, SUBTASK_STATE_MAP)
class TSubtaskCompletion : TNonCopyable, public ISubtaskListener {
friend struct TTaskAccessor;
private:
TAtomicBox<ESubtaskState> State;
TTaskRunnerBase* volatile TaskRunner;
TSubtaskCompletionFunc CompletionFunc;
public:
TSubtaskCompletion()
: State(CREATED)
, TaskRunner()
{
}
~TSubtaskCompletion() override;
// Either done or cancel requested or cancelled
bool IsComplete() const {
ESubtaskState state = State.Get();
switch (state) {
case RUNNING:
return false;
case DONE:
return true;
case CANCEL_REQUESTED:
return false;
case CANCELED:
return true;
case CREATED:
Y_ABORT("not started");
default:
Y_ABORT("unknown value: %u", (unsigned)state);
}
}
void FireCompletionCallback(ITaskBase*);
void SetCompletionCallback(TSubtaskCompletionFunc func) {
CompletionFunc = func;
}
// Completed, but not cancelled
bool IsDone() const {
return State.Get() == DONE;
}
// Request cancel by actor
// Does nothing but marks task cancelled,
// and allows proceeding to next callback
void Cancel();
// called by service provider implementations
// must not be called by actor
void SetRunning(TTaskRunnerBase* parent);
void SetDone() override;
};
// See ISimpleTask, ICoroTask
class TTaskRunnerBase: public TAtomicRefCount<TTaskRunnerBase>, public NActor::TActor<TTaskRunnerBase> {
friend class NActor::TActor<TTaskRunnerBase>;
friend class TContinueFunc;
friend struct TTaskAccessor;
friend class TSubtaskCompletion;
private:
THolder<ITaskBase> Impl;
ISubtaskListener* const ParentTask;
// While task is running, it holds extra reference to self.
//bool HoldsSelfReference;
bool Done;
bool SetDoneCalled;
// Subtasks currently executed.
TVector<TSubtaskCompletion*> Pending;
void Act(NActor::TDefaultTag);
public:
// Construct task. Task is not automatically started.
TTaskRunnerBase(IEnv*, ISubtaskListener* parent, TAutoPtr<ITaskBase> impl);
~TTaskRunnerBase() override;
bool IsRunningInThisThread() const;
void AssertInThisThread() const;
static TTaskRunnerBase* CurrentTask();
static ITaskBase* CurrentTaskImpl();
TString GetStatusSingleLine();
protected:
//void RetainRef();
//void ReleaseRef();
ITaskBase* GetImplBase() {
return Impl.Get();
}
private:
// true if need to call again
virtual bool ReplyReceived() = 0;
};
class ITaskBase {
public:
virtual ~ITaskBase() {
}
};
// Check that current method executed inside some task.
bool AreWeInsideTask();
}
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