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#include "Thread.h"

#include <QSignalMapper>

Thread::Thread( QObject * const parent )
    : QThread( parent )
{
    // we need a class that receives signals from other threads and emits a signal in response
    m_shutDownHelper = new QSignalMapper;
    m_shutDownHelper->setMapping( this, 0 );
    connect( this, SIGNAL(started()), this, SLOT(setReadyStatus()), Qt::DirectConnection );
    connect( this, SIGNAL(aboutToStop()), m_shutDownHelper, SLOT(map()));
}

Thread::~Thread()
{
    delete m_shutDownHelper;
}

// starts thread, moves worker to this thread and blocks
void Thread::launchWorker( QObject * const worker )
{
    m_worker = worker;
    start();
    m_worker->moveToThread( this );
    m_shutDownHelper->moveToThread( this );
    connect( m_shutDownHelper, SIGNAL(mapped(int)), this, SLOT(stopExecutor()), Qt::DirectConnection );
    m_mutex.lock();
    m_waitCondition.wait( &m_mutex );
}

// puts a command to stop processing in the event queue of worker thread
void Thread::stop()
{
    emit aboutToStop();
}

// methods above this line should be called in ui thread context
// methods below this line are private and will be run in  secondary thread context

void Thread::stopExecutor()  //secondary thread context
{
    exit();
}

void Thread::setReadyStatus()
{
    m_waitCondition.wakeAll();
}

#include "Thread.moc"
