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/*
* Buffer.h
*****************************************************************************
* Copyright (C) 2012, bitmovin Softwareentwicklung OG, All Rights Reserved
*
* Email: libdash-dev@vicky.bitmovin.net
*
* This source code and its use and distribution, is subject to the terms
* and conditions of the applicable license agreement.
*****************************************************************************/
#ifndef LIBDASH_FRAMEWORK_BUFFER_BUFFER_H_
#define LIBDASH_FRAMEWORK_BUFFER_BUFFER_H_
#include "../Portable/MultiThreading.h"
#include "IBufferObserver.h"
#include <deque>
#include <vector>
namespace libdash
{
namespace framework
{
namespace buffer
{
template <class T>
class Buffer
{
public:
Buffer(uint32_t maxcapacity, BufferType type);
virtual ~Buffer();
bool pushBack(T *element);
T* front();
T* getFront();
void popFront();
void clearTail();
void clear();
void setEOS(bool value);
uint32_t length();
uint32_t capacity();
void attachObserver(IBufferObserver *observer);
void notify();
private:
std::deque<T*> objects;
std::vector<IBufferObserver *> observer;
bool eos;
uint32_t maxcapacity;
mutable CRITICAL_SECTION monitorMutex;
mutable CONDITION_VARIABLE full;
mutable CONDITION_VARIABLE empty;
BufferType type;
};
}
}
}
using namespace libdash::framework::buffer;
template <class T>
Buffer<T>::Buffer(uint32_t maxcapacity, BufferType type) :
type (type),
eos (false),
maxcapacity (maxcapacity)
{
InitializeConditionVariable (&this->full);
InitializeConditionVariable (&this->empty);
InitializeCriticalSection (&this->monitorMutex);
}
template <class T> Buffer<T>::~Buffer()
{
this->clear();
DeleteConditionVariable (&this->full);
DeleteConditionVariable (&this->empty);
DeleteCriticalSection (&this->monitorMutex);
}
template <class T> bool Buffer<T>::pushBack(T *object)
{
EnterCriticalSection(&this->monitorMutex);
while(this->objects.size() >= this->maxcapacity && !this->eos)
SleepConditionVariableCS(&this->empty, &this->monitorMutex, INFINITE);
if(this->objects.size() >= this->maxcapacity)
{
LeaveCriticalSection(&this->monitorMutex);
return false;
}
this->objects.push_back(object);
WakeAllConditionVariable(&this->full);
LeaveCriticalSection(&this->monitorMutex);
this->notify();
return true;
}
template <class T> T* Buffer<T>::front()
{
EnterCriticalSection(&this->monitorMutex);
while(this->objects.size() == 0 && !this->eos)
SleepConditionVariableCS(&this->full, &this->monitorMutex, INFINITE);
if(this->objects.size() == 0)
{
LeaveCriticalSection(&this->monitorMutex);
return NULL;
}
T *object = this->objects.front();
LeaveCriticalSection(&this->monitorMutex);
return object;
}
template <class T> T* Buffer<T>::getFront()
{
EnterCriticalSection(&this->monitorMutex);
while(this->objects.size() == 0 && !this->eos)
SleepConditionVariableCS(&this->full, &this->monitorMutex, INFINITE);
if(this->objects.size() == 0)
{
LeaveCriticalSection(&this->monitorMutex);
return NULL;
}
T *object = this->objects.front();
this->objects.pop_front();
this->objects.shrink_to_fit();
WakeAllConditionVariable(&this->empty);
LeaveCriticalSection(&this->monitorMutex);
this->notify();
return object;
}
template <class T> uint32_t Buffer<T>::length()
{
EnterCriticalSection(&this->monitorMutex);
uint32_t ret = this->objects.size();
LeaveCriticalSection(&this->monitorMutex);
return ret;
}
template <class T> void Buffer<T>::popFront()
{
EnterCriticalSection(&this->monitorMutex);
this->objects.pop_front();
this->objects.shrink_to_fit();
WakeAllConditionVariable(&this->empty);
LeaveCriticalSection(&this->monitorMutex);
this->Notify();
}
template <class T> void Buffer<T>::setEOS(bool value)
{
EnterCriticalSection(&this->monitorMutex);
this->eos = value;
WakeAllConditionVariable(&this->empty);
WakeAllConditionVariable(&this->full);
LeaveCriticalSection(&this->monitorMutex);
}
template <class T> void Buffer<T>::attachObserver(IBufferObserver *observer)
{
this->observer.push_back(observer);
}
template <class T> void Buffer<T>::notify()
{
for(size_t i = 0; i < this->observer.size(); i++)
this->observer.at(i)->onBufferStateChanged(this->type, (uint32_t)((double)this->objects.size()/(double)this->maxcapacity*100.0), this->maxcapacity);
}
template <class T> void Buffer<T>::clearTail()
{
EnterCriticalSection(&this->monitorMutex);
int size = this->objects.size() - 1;
if (size < 1)
{
LeaveCriticalSection(&this->monitorMutex);
return;
}
T* object = this->objects.front();
this->objects.pop_front();
for(int i=0; i < size; i++)
{
delete this->objects.front();
this->objects.pop_front();
}
this->objects.shrink_to_fit();
this->objects.push_back(object);
WakeAllConditionVariable(&this->empty);
WakeAllConditionVariable(&this->full);
LeaveCriticalSection(&this->monitorMutex);
this->Notify();
}
template <class T> void Buffer<T>::clear()
{
EnterCriticalSection(&this->monitorMutex);
for(int i = 0; i < this->objects.size(); i++)
delete this->objects[i];
this->objects.clear();
this->objects.shrink_to_fit();
WakeAllConditionVariable(&this->empty);
WakeAllConditionVariable(&this->full);
LeaveCriticalSection(&this->monitorMutex);
this->notify();
}
template <class T> uint32_t Buffer<T>::capacity()
{
return this->maxcapacity;
}
#endif /* LIBDASH_FRAMEWORK_BUFFER_BUFFER_H_ */
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