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123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
/**
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@file
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@author Stefan Frings
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*/
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#ifndef HTTPSESSION_H
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#define HTTPSESSION_H
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#include <QByteArray>
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#include <QVariant>
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#include <QReadWriteLock>
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#include "httpglobal.h"
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namespace qtwebapp {
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/**
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This class stores data for a single HTTP session.
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A session can store any number of key/value pairs. This class uses implicit
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sharing for read and write access. This class is thread safe.
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@see HttpSessionStore should be used to create and get instances of this class.
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*/
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class DECLSPEC HttpSession {
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public:
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/**
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Constructor.
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@param canStore The session can store data, if this parameter is true.
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Otherwise all calls to set() and remove() do not have any effect.
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*/
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HttpSession(bool canStore=false);
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/**
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Copy constructor. Creates another HttpSession object that shares the
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data of the other object.
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*/
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HttpSession(const HttpSession& other);
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/**
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Copy operator. Detaches from the current shared data and attaches to
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the data of the other object.
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*/
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HttpSession& operator= (const HttpSession& other);
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/**
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Destructor. Detaches from the shared data.
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*/
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virtual ~HttpSession();
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/** Get the unique ID of this session. This method is thread safe. */
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QByteArray getId() const;
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/**
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Null sessions cannot store data. All calls to set() and remove()
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do not have any effect.This method is thread safe.
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*/
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bool isNull() const;
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/** Set a value. This method is thread safe. */
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void set(const QByteArray& key, const QVariant& value);
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/** Remove a value. This method is thread safe. */
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void remove(const QByteArray& key);
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/** Get a value. This method is thread safe. */
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QVariant get(const QByteArray& key) const;
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/** Check if a key exists. This method is thread safe. */
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bool contains(const QByteArray& key) const;
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/**
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Get a copy of all data stored in this session.
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Changes to the session do not affect the copy and vice versa.
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This method is thread safe.
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*/
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QMap<QByteArray,QVariant> getAll() const;
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/**
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Get the timestamp of last access. That is the time when the last
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HttpSessionStore::getSession() has been called.
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This method is thread safe.
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*/
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qint64 getLastAccess() const;
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/**
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Set the timestamp of last access, to renew the timeout period.
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Called by HttpSessionStore::getSession().
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This method is thread safe.
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*/
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void setLastAccess();
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private:
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struct HttpSessionData {
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/** Unique ID */
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QByteArray id;
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/** Timestamp of last access, set by the HttpSessionStore */
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qint64 lastAccess;
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/** Reference counter */
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int refCount;
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/** Used to synchronize threads */
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QReadWriteLock lock;
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/** Storage for the key/value pairs; */
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QMap<QByteArray,QVariant> values;
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};
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/** Pointer to the shared data. */
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HttpSessionData* dataPtr;
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};
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} // end of namespace
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#endif // HTTPSESSION_H
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