looqs/shared/paralleldirscanner.cpp

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#include "paralleldirscanner.h"
#include <QRunnable>
#include <QMutex>
#include <QDirIterator>
#include <QThread>
#include <QThreadPool>
#include <functional>
#include "dirscanworker.h"
#include "logger.h"
ParallelDirScanner::ParallelDirScanner()
{
this->threadpool.setMaxThreadCount(QThread::idealThreadCount() / 2);
}
ConcurrentQueue<QString> &ParallelDirScanner::getResults()
{
return this->resultPathsQueue;
}
void ParallelDirScanner::setIgnorePatterns(QStringList patterns)
{
this->ignorePatterns = patterns;
}
void ParallelDirScanner::setPaths(QVector<QString> paths)
{
this->paths = paths;
}
void ParallelDirScanner::cancel()
{
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this->stopToken.store(true, std::memory_order_seq_cst);
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}
void ParallelDirScanner::handleWorkersProgress(unsigned int progress)
{
this->processedPaths += progress;
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if(!this->stopToken.load(std::memory_order_seq_cst))
emit this->progress(progress, this->processedPaths);
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}
void ParallelDirScanner::handleWorkersFinish()
{
// no mutexes required due to queued connection
++finishedWorkers;
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if(this->stopToken.load(std::memory_order_seq_cst) || finishedWorkers == getThreadsNum())
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{
running = false;
emit scanComplete();
}
}
unsigned int ParallelDirScanner::getThreadsNum() const
{
int threadsNum = this->threadpool.maxThreadCount();
if(threadsNum > this->paths.size())
{
threadsNum = this->paths.size();
}
return threadsNum;
}
void ParallelDirScanner::scan()
{
this->stopToken.store(false, std::memory_order_relaxed);
this->finishedWorkers = 0;
this->processedPaths = 0;
this->targetPathsQueue.clear();
this->resultPathsQueue.clear();
this->targetPathsQueue.enqueue(this->paths);
int threadsNum = getThreadsNum();
if(threadsNum == 0)
{
emit scanComplete();
return;
}
running = true;
for(int i = 0; i < threadsNum; i++)
{
DirScanWorker *runnable = new DirScanWorker(this->targetPathsQueue, this->resultPathsQueue,
this->ignorePatterns, 1000, this->stopToken);
runnable->setAutoDelete(false);
connect(runnable, &DirScanWorker::progress, this, &ParallelDirScanner::handleWorkersProgress,
Qt::QueuedConnection);
connect(runnable, &DirScanWorker::finished, this, &ParallelDirScanner::handleWorkersFinish,
Qt::QueuedConnection);
threadpool.start(runnable);
}
}
bool ParallelDirScanner::isRunning()
{
return this->running;
}
unsigned int ParallelDirScanner::pathCount()
{
return this->processedPaths;
}