59 lines
1.2 KiB
C++
59 lines
1.2 KiB
C++
#ifndef DATALOADER_H
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#define DATALOADER_H
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#include <QObject>
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#include <QRunnable>
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#include <QThreadPool>
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#include <QHash>
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#include <QMutex>
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#include <QVariant>
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class DataLoader : public QObject
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{
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Q_OBJECT
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public:
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explicit DataLoader(QObject* parent = nullptr);
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~DataLoader();
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void requestData(const QString& dataKey);
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void cancelRequest(const QString& dataKey);
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void setMaxThreads(int count);
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signals:
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void dataLoaded(const QString& dataKey, const QVariant& data);
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void errorOccurred(const QString& dataKey, const QString& error);
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public slots:
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void handleShutdown();
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private:
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class LoadTask : public QRunnable
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{
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public:
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LoadTask(DataLoader* loader, const QString& key)
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:m_loader(loader), m_key(key)
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{
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setAutoDelete(false);//禁用自动析构，由DataLoader控制管理
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}
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void run() override
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{
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QVariant data = fetchRealData(m_key);
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emit m_loader->dataLoaded(m_key, data);
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}
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private:
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QVariant fetchRealData(const QString& dataKey);
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DataLoader* m_loader;
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QString m_key;
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};
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QThreadPool m_threadPool;
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QHash<QString, LoadTask*> m_runningTasks;
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QMutex m_taskMutex;
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};
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#endif
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