78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
#ifndef DATAMANAGER_H
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#define DATAMANAGER_H
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#include <QObject>
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#include <QHash>
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#include <QQueue>
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#include <QVariant>
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#include <QPointer>
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#include <QTimer>
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#include <QDateTime>
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#include <QMutexLocker>
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#include <QReadWriteLock>
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class HttpRequestManager;
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class DataManager : public QObject
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{
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Q_OBJECT
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Q_DISABLE_COPY(DataManager) //禁止拷贝，等价于：DataManager(const DataManager&) = delete; DataManager& operator=(const DataManager&) = delete;
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public:
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struct CacheEntry
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{
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QVariant data;
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QDateTime timestamp;
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int accessCount = 0;
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bool isUpdating = false;
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//QSet<QObject*> pendingRequests;
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};
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static DataManager* instance();
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void registerDataSource(const QString& dataKey, std::function<QVariant()> fetcher);
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void registerHttpDataSource(const QString& dataKey, const QUrl& url, const QByteArray& method = "GET",
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const QByteArray& body = QByteArray(), const QMap<QByteArray, QByteArray>& headers = {});
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QVariant getCacheData(const QString& dataKey);
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bool hasData(const QString& dataKey);
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void requestData(const QString& dataKey, QObject* requester);
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void setCacheTimeout(int seconds);
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HttpRequestManager* httpManager();
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signals:
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void dataUpdated(const QString& dataKey, const QVariant& data, const QDateTime& timestamp);
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void cacheInvalidated(const QString& dataKey);
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public slots:
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void invalidateCache(const QString& dataKey = QString());
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void processRequestQueue();
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void handleHttpDataReceived(const QString& dataKey, const QVariant& data);
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void handleHttpRequsetFailed(const QString& dataKey, const QVariant& data);
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private:
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struct RequestInfo
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{
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QString dataKey;
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//QObject* requester;
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QPointer<QObject> requester;
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};
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explicit DataManager();
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~DataManager();
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void triggerDataUpdate(const QString& dataKey);
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QHash<QString, CacheEntry> m_cache;
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QHash<QString, std::function<QVariant()>> m_dataSources;
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QSet<QString> m_pendingUpdates;
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QQueue<RequestInfo> m_requestQueue;
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QTimer m_requestTimer;
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QReadWriteLock m_cacheLock;
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QMutex m_requestMutex;
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HttpRequestManager* m_httpManager;
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int m_cacheTimeout = 300; //默认5分钟
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int m_minRefreshInterval = 100; //最小刷新间隔(ms)
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};
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#endif
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