ThumbnailBroker for background retrieval and rendering

1 files changed, 372 insertions, 0 deletions

diff --git a/src/client/ThumbnailBroker.cpp b/src/client/ThumbnailBroker.cpp
new file mode 100644
index 0000000..86a38d8
--- /dev/null
+++ b/src/client/ThumbnailBroker.cpp
@@ -0,0 +1,372 @@
+#include <algorithm>
+#include <iostream>
+#include <typeinfo>
+#include "ThumbnailBroker.h"
+#include "ThumbnailListener.h"
+#include "Client.h"
+#include "GameSave.h"
+#include "search/Thumbnail.h"
+#include "simulation/SaveRenderer.h"
+
+//Asynchronous Thumbnail render & request processing
+
+class ThumbnailBroker::ThumbnailSpec
+{
+public:
+	int Width, Height;
+	ThumbnailListener * CompletedListener;
+	ThumbnailSpec(int width, int height, ThumbnailListener * completedListener) :
+		Width(width), Height(height), CompletedListener(completedListener) {}
+};
+
+class ThumbnailBroker::ThumbnailID
+{
+public:
+	int SaveID, SaveDate;
+	bool operator ==(const ThumbnailID & second)
+	{
+		return SaveID == second.SaveID && SaveDate == second.SaveDate;
+	}
+	ThumbnailID(int saveID, int saveDate) : SaveID(saveID), SaveDate(saveDate) {}
+	ThumbnailID() : SaveID(0), SaveDate(0) {}
+};
+
+class ThumbnailBroker::ThumbnailRequest
+{
+public:
+	bool Complete;
+	void * HTTPContext;
+	int RequestTime;
+
+	ThumbnailID ID;
+	std::vector<ThumbnailSpec> SubRequests;
+	
+	ThumbnailRequest(int saveID, int saveDate, int width, int height, ThumbnailListener * completedListener) :
+		ID(saveID, saveDate), Complete(false), HTTPContext(NULL), RequestTime(0)
+		{
+			SubRequests.push_back(ThumbnailSpec(width, height, completedListener));
+		}
+	ThumbnailRequest() : Complete(false), HTTPContext(NULL), RequestTime(0) {}
+};
+
+class ThumbnailBroker::ThumbRenderRequest
+{
+public:
+	int Width, Height;
+	GameSave * Save;
+	ThumbnailListener * CompletedListener;
+	ThumbRenderRequest(GameSave * save, int width, int height, ThumbnailListener * completedListener) :
+		Save(save), Width(width), Height(height), CompletedListener(completedListener) {}
+	ThumbRenderRequest() :	Save(0), Width(0), Height(0), CompletedListener(NULL) {}
+};
+
+ThumbnailBroker::ThumbnailBroker()
+{
+	thumbnailQueueRunning = false;
+	thumbnailQueueMutex = PTHREAD_MUTEX_INITIALIZER;
+	pthread_mutex_init (&thumbnailQueueMutex, NULL);
+
+	listenersMutex = PTHREAD_MUTEX_INITIALIZER;
+	pthread_mutex_init (&listenersMutex, NULL);
+}
+
+ThumbnailBroker::~ThumbnailBroker()
+{
+
+}
+
+void ThumbnailBroker::RenderThumbnail(GameSave * gameSave, int width, int height, ThumbnailListener * tListener)
+{
+	AttachThumbnailListener(tListener);
+	pthread_mutex_lock(&thumbnailQueueMutex);
+	bool running = thumbnailQueueRunning;
+	thumbnailQueueRunning = true;
+	renderRequests.push_back(ThumbRenderRequest(new GameSave(*gameSave), width, height, tListener));
+	pthread_mutex_unlock(&thumbnailQueueMutex);
+	
+	if(!running)
+	{
+#ifdef DEBUG
+		std::cout << typeid(*this).name() << " Starting background thread for new " << __FUNCTION__ << " request" << std::endl;
+#endif
+		pthread_create(&thumbnailQueueThread, 0, &ThumbnailBroker::thumbnailQueueProcessHelper, this);
+	}
+}
+
+void ThumbnailBroker::RetrieveThumbnail(int saveID, int saveDate, int width, int height, ThumbnailListener * tListener)
+{
+	AttachThumbnailListener(tListener);
+	pthread_mutex_lock(&thumbnailQueueMutex);
+	bool running = thumbnailQueueRunning;
+	thumbnailQueueRunning = true;
+	thumbnailRequests.push_back(ThumbnailRequest(saveID, saveDate, width, height, tListener));
+	pthread_mutex_unlock(&thumbnailQueueMutex);
+
+	if(!running)
+	{
+#ifdef DEBUG
+		std::cout << typeid(*this).name() << " Starting background thread for new " << __FUNCTION__ << " request" << std::endl;
+#endif
+		pthread_create(&thumbnailQueueThread, 0, &ThumbnailBroker::thumbnailQueueProcessHelper, this);
+	}
+}
+
+void * ThumbnailBroker::thumbnailQueueProcessHelper(void * ref)
+{
+	((ThumbnailBroker*)ref)->thumbnailQueueProcessTH();
+	return NULL;
+}
+
+void ThumbnailBroker::FlushThumbQueue()
+{
+	pthread_mutex_lock(&thumbnailQueueMutex);
+	while(thumbnailComplete.size())
+	{
+		if(CheckThumbnailListener(thumbnailComplete.front().first))
+			thumbnailComplete.front().first->OnThumbnailReady(thumbnailComplete.front().second);
+		else
+			delete thumbnailComplete.front().second;
+		thumbnailComplete.pop_front();
+	}	
+	pthread_mutex_unlock(&thumbnailQueueMutex);
+}
+
+void ThumbnailBroker::thumbnailQueueProcessTH()
+{
+	time_t lastAction = time(NULL);
+	while(true)
+	{
+		//Shutdown after 2 seconds of idle
+		if(time(NULL) - lastAction > 2)
+		{
+			pthread_mutex_lock(&thumbnailQueueMutex);
+			thumbnailQueueRunning = false;
+			pthread_mutex_unlock(&thumbnailQueueMutex);
+			break;
+		}
+
+		//Renderer
+		pthread_mutex_lock(&thumbnailQueueMutex);
+		if(renderRequests.size())
+		{
+			lastAction = time(NULL);
+			ThumbRenderRequest req;
+			req = renderRequests.front();
+			renderRequests.pop_front();
+			pthread_mutex_unlock(&thumbnailQueueMutex);
+
+#ifdef DEBUG
+			std::cout << typeid(*this).name() << " Processing render request" << std::endl;
+#endif
+
+			Thumbnail * thumbnail = SaveRenderer::Ref().Render(req.Save);
+			delete req.Save;
+
+			if(thumbnail)
+			{
+				thumbnail->Resize(req.Width, req.Height);
+
+				pthread_mutex_lock(&thumbnailQueueMutex);
+				thumbnailComplete.push_back(std::pair<ThumbnailListener*, Thumbnail*>(req.CompletedListener, thumbnail));
+				pthread_mutex_unlock(&thumbnailQueueMutex);	
+			}
+		}
+		else
+		{
+			pthread_mutex_unlock(&thumbnailQueueMutex);
+		}
+
+		//Renderer
+		pthread_mutex_lock(&thumbnailQueueMutex);
+		if(thumbnailRequests.size())
+		{
+			lastAction = time(NULL);
+			Thumbnail * thumbnail = NULL;
+
+			ThumbnailRequest req;
+			req = thumbnailRequests.front();
+
+			//Check the cache
+			for(std::deque<std::pair<ThumbnailID, Thumbnail*> >::iterator iter = thumbnailCache.begin(), end = thumbnailCache.end(); iter != end; ++iter)
+			{
+				if((*iter).first == req.ID)
+				{
+					thumbnail = (*iter).second;
+#ifdef DEBUG
+					std::cout << typeid(*this).name() << " " << req.ID.SaveID << ":" << req.ID.SaveDate << " found in cache" << std::endl;
+#endif
+				}
+			}
+
+			if(thumbnail)
+			{
+				//Got thumbnail from cache
+				thumbnailRequests.pop_front();
+				pthread_mutex_unlock(&thumbnailQueueMutex);
+
+				for(std::vector<ThumbnailSpec>::iterator specIter = req.SubRequests.begin(), specEnd = req.SubRequests.end(); specIter != specEnd; ++specIter)
+				{
+					Thumbnail * tempThumbnail = new Thumbnail(*thumbnail);
+					tempThumbnail->Resize((*specIter).Width, (*specIter).Height);
+
+					pthread_mutex_lock(&thumbnailQueueMutex);
+					thumbnailComplete.push_back(std::pair<ThumbnailListener*, Thumbnail*>((*specIter).CompletedListener, tempThumbnail));
+					pthread_mutex_unlock(&thumbnailQueueMutex);	
+				}
+			}
+			else if(!thumbnail)
+			{
+				//Check for ongoing requests
+				bool requested = false;
+				for(std::list<ThumbnailRequest>::iterator iter = currentRequests.begin(), end = currentRequests.end(); iter != end; ++iter)
+				{
+					if((*iter).ID == req.ID)
+					{
+						requested = true;
+						
+						//Add the current listener to the item already being requested
+						(*iter).SubRequests.push_back(req.SubRequests.front());
+					}
+				}
+
+				if(requested)
+				{
+					//Already requested
+					thumbnailRequests.pop_front();
+					pthread_mutex_unlock(&thumbnailQueueMutex);
+				}
+				else if(currentRequests.size() < IMGCONNS) //If it's not already being requested and we still have more space for a new connection, request it
+				{
+					thumbnailRequests.pop_front();
+					pthread_mutex_unlock(&thumbnailQueueMutex);
+
+					//If it's not already being requested, request it
+					if(!requested && CheckThumbnailListener(req.SubRequests.front().CompletedListener))
+					{
+						std::stringstream urlStream;
+						urlStream << "http://" << STATICSERVER << "/" << req.ID.SaveID;
+						if(req.ID.SaveDate)
+						{
+							urlStream << "_" << req.ID.SaveDate;
+						}
+						urlStream << "_small.pti";
+
+#ifdef DEBUG
+						std::cout << typeid(*this).name() << " Creating new request for " << req.ID.SaveID << ":" << req.ID.SaveDate << std::endl;
+#endif
+
+						req.HTTPContext = http_async_req_start(NULL, (char *)urlStream.str().c_str(), NULL, 0, 1);
+						req.RequestTime = time(NULL);
+						currentRequests.push_back(req);
+					}
+				}
+				else
+				{
+					//Already full of requests
+					pthread_mutex_unlock(&thumbnailQueueMutex);
+
+				}
+			}
+		}
+		else
+		{
+			pthread_mutex_unlock(&thumbnailQueueMutex);
+		}
+
+		std::list<ThumbnailRequest>::iterator iter = currentRequests.begin();
+		std::list<ThumbnailRequest>::iterator end = currentRequests.end();
+		while (iter != currentRequests.end())
+		{
+			lastAction = time(NULL);
+
+			ThumbnailRequest req = *iter;
+			Thumbnail * thumbnail = NULL;
+
+			if(http_async_req_status(req.HTTPContext))
+			{
+
+				pixel * thumbData;
+				char * data;
+				int status, data_size, imgw, imgh;
+				data = http_async_req_stop(req.HTTPContext, &status, &data_size);
+				free(req.HTTPContext);
+
+				if (status == 200 && data)
+				{
+					thumbData = Graphics::ptif_unpack(data, data_size, &imgw, &imgh);
+					free(data);
+
+					if(thumbData)
+					{
+						thumbnail = new Thumbnail(req.ID.SaveID, req.ID.SaveID, thumbData, ui::Point(imgw, imgh));
+						free(thumbData);
+					}
+					else
+					{
+						thumbnail = new Thumbnail(req.ID.SaveID, req.ID.SaveID, thumbData, ui::Point(128, 128));
+						free(thumbData);
+					}
+
+					if(thumbnailCache.size() >= THUMB_CACHE_SIZE)
+					{
+						delete thumbnailCache.front().second;
+						thumbnailCache.pop_front();
+					}
+					thumbnailCache.push_back(std::pair<ThumbnailID, Thumbnail*>(req.ID, thumbnail));
+
+					for(std::vector<ThumbnailSpec>::iterator specIter = req.SubRequests.begin(), specEnd = req.SubRequests.end(); specIter != specEnd; ++specIter)
+					{
+						Thumbnail * tempThumbnail = new Thumbnail(*thumbnail);
+						tempThumbnail->Resize((*specIter).Width, (*specIter).Height);
+
+						pthread_mutex_lock(&thumbnailQueueMutex);
+						thumbnailComplete.push_back(std::pair<ThumbnailListener*, Thumbnail*>((*specIter).CompletedListener, tempThumbnail));
+						pthread_mutex_unlock(&thumbnailQueueMutex);	
+					}
+				}
+				else
+				{
+#ifdef DEBUG
+					std::cout << typeid(*this).name() << " Request for " << req.ID.SaveID << ":" << req.ID.SaveDate << " failed with status " << status << std::endl;
+#endif	
+					if(data)
+						free(data);
+				}
+				iter = currentRequests.erase(iter);
+			}
+			else
+			{
+				++iter;
+			}
+		}
+
+	}
+}
+
+void ThumbnailBroker::RetrieveThumbnail(int saveID, int width, int height, ThumbnailListener * tListener)
+{
+	RetrieveThumbnail(saveID, 0, width, height, tListener);
+}
+
+bool ThumbnailBroker::CheckThumbnailListener(ThumbnailListener * tListener)
+{
+	pthread_mutex_lock(&listenersMutex);
+	int count = std::count(validListeners.begin(), validListeners.end(), tListener);
+	pthread_mutex_unlock(&listenersMutex);
+
+	return count;
+}
+
+void ThumbnailBroker::AttachThumbnailListener(ThumbnailListener * tListener)
+{
+	pthread_mutex_lock(&listenersMutex);
+	validListeners.push_back(tListener);
+	pthread_mutex_unlock(&listenersMutex);
+}
+
+void ThumbnailBroker::DetachThumbnailListener(ThumbnailListener * tListener)
+{
+	pthread_mutex_lock(&listenersMutex);
+	std::remove(validListeners.begin(), validListeners.end(), tListener);
+	pthread_mutex_unlock(&listenersMutex);
+}
\ No newline at end of file