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PyProducerConsumer.h
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194 lines (155 loc) · 4.04 KB
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#ifndef _PYPRODUCER_H
#define _PYPRODUCER_H
#include "DebugTrace.h"
namespace NppPythonScript
{
template<typename DataT>
class PyProducerConsumer
{
public:
PyProducerConsumer();
virtual ~PyProducerConsumer();
void startConsumer();
void stopConsumer();
bool consumerBusy();
protected:
bool produce(std::shared_ptr<DataT> data);
virtual void consume(std::shared_ptr<DataT> data) = 0;
virtual void queueComplete() { };
DWORD getConsumerThreadID() { return m_dwThreadId; };
private:
PyProducerConsumer(const PyProducerConsumer& copy);
PyProducerConsumer& operator = (const PyProducerConsumer& assign);
HANDLE m_queueMutex;
HANDLE m_dataAvailable;
HANDLE m_shutdown;
std::queue<std::shared_ptr<DataT> > m_queue;
DWORD m_dwThreadId;
HANDLE m_hConsumerThread;
bool m_consuming;
void consumer();
static void threadStart(PyProducerConsumer *instance);
};
template <typename DataT>
PyProducerConsumer<DataT>::PyProducerConsumer() :
m_queueMutex(CreateMutex(NULL, FALSE, NULL)),
m_dataAvailable(CreateEvent(NULL, TRUE, FALSE, NULL)),
m_shutdown(CreateEvent(NULL, TRUE, FALSE, NULL)),
m_dwThreadId(NULL),
m_hConsumerThread(NULL),
m_consuming(false)
{
}
template <typename DataT>
PyProducerConsumer<DataT>::~PyProducerConsumer()
{
stopConsumer();
CloseHandle(m_queueMutex);
m_queueMutex = NULL;
CloseHandle(m_dataAvailable);
m_dataAvailable = NULL;
CloseHandle(m_shutdown);
m_shutdown = NULL;
}
template <typename DataT>
void PyProducerConsumer<DataT>::stopConsumer()
{
SetEvent(m_shutdown);
if (m_hConsumerThread)
{
WaitForSingleObject(m_hConsumerThread, INFINITE);
CloseHandle(m_hConsumerThread);
m_hConsumerThread = NULL;
}
}
template <typename DataT>
bool PyProducerConsumer<DataT>::produce(std::shared_ptr<DataT> data)
{
bool retVal = false;
DWORD mutexResult = WaitForSingleObject(m_queueMutex, INFINITE);
if (mutexResult == WAIT_OBJECT_0)
{
try
{
m_queue.push(data);
retVal = true;
}
catch(...)
{
}
ReleaseMutex(m_queueMutex);
SetEvent(m_dataAvailable);
}
return retVal;
}
template<typename DataT>
void PyProducerConsumer<DataT>::startConsumer()
{
if (!m_hConsumerThread)
{
m_hConsumerThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)threadStart, this, 0, &m_dwThreadId);
}
}
template<typename DataT>
bool PyProducerConsumer<DataT>::consumerBusy()
{
return m_consuming;
}
template<typename DataT>
void PyProducerConsumer<DataT>::consumer()
{
HANDLE waitHandles[] = {m_dataAvailable, m_shutdown};
bool queueEmpty;
for(;;)
{
DWORD waitResult = WaitForMultipleObjects(2, waitHandles, FALSE, INFINITE);
if (waitResult == WAIT_OBJECT_0 + 1 || waitResult == WAIT_ABANDONED_0 + 1) // Shutdown signalled
{
// Shutdown immediately
// An alternative would be to "finish up" the queue
// but we don't want to do that in PyScript - just close N++
break;
}
m_consuming = true;
DWORD queueAvailable = WaitForSingleObject(m_queueMutex, INFINITE);
if (queueAvailable == WAIT_OBJECT_0)
{
DEBUG_TRACE(L"Popping Queue\n");
queueEmpty = false;
std::shared_ptr<DataT> data = m_queue.front();
m_queue.pop();
if (m_queue.empty())
{
queueEmpty = true;
ResetEvent(m_dataAvailable);
}
ReleaseMutex(m_queueMutex);
try {
DEBUG_TRACE(L"Consuming...\n");
consume(data);
DEBUG_TRACE(L"End Consume\n");
}
catch(...) {
queueEmpty = queueEmpty;
}
if (queueEmpty)
{
DEBUG_TRACE(L"Waiting for dataAvailable\n");
waitResult = WaitForSingleObject(m_dataAvailable, 0);
DEBUG_TRACE(L"dataAvailable signalled\n");
if (waitResult != WAIT_OBJECT_0)
{
m_consuming = false;
queueComplete();
}
}
}
}
}
template<typename DataT>
void PyProducerConsumer<DataT>::threadStart(PyProducerConsumer *instance)
{
instance->consumer();
}
}
#endif