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#ifndef CSM_DOC_LOADER_H
#define CSM_DOC_LOADER_H
#include <chrono>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include <QMutex>
#include <QObject>
#include <QWaitCondition>
class QTimer;
namespace CSMDoc
{
class Document;
class Loader : public QObject
{
Q_OBJECT
struct Stage
{
int mFile = 0;
int mRecordsLoaded = 0;
bool mRecordsLeft = false;
};
QMutex mMutex;
QWaitCondition mThingsToDo;
std::vector<std::pair<Document*, Stage>> mDocuments;
QTimer* mTimer;
bool mShouldStop;
std::optional<std::chrono::steady_clock::time_point> mStart;
public:
Loader();
QWaitCondition& hasThingsToDo();
void stop();
private slots:
void load();
public slots:
void loadDocument(CSMDoc::Document* document);
///< The ownership of \a document is not transferred.
void abortLoading(CSMDoc::Document* document);
///< Abort loading \a docuemnt (ignored if \a document has already finished being
/// loaded). Will result in a documentNotLoaded signal, once the Loader has finished
/// cleaning up.
signals:
void documentLoaded(Document* document);
///< The ownership of \a document is not transferred.
void documentNotLoaded(Document* document, const std::string& error);
///< Document load has been interrupted either because of a call to abortLoading
/// or a problem during loading). In the former case error will be an empty string.
void nextStage(CSMDoc::Document* document, const std::string& name, int totalRecords);
void nextRecord(CSMDoc::Document* document, int records);
///< \note This signal is only given once per group of records. The group size is
/// approximately the total number of records divided by the steps value of the
/// previous nextStage signal.
void loadMessage(CSMDoc::Document* document, const std::string& message);
///< Non-critical load error or warning
};
}
#endif
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