QgsConnectionPool< T, T_Group > Class Template Reference

Template class responsible for keeping a pool of open connections. More...

#include <qgsconnectionpool.h>

Public Types
typedef QMap< QString, T_Group * >	T_Groups

Public Member Functions
T	acquireConnection (const QString &connInfo)
	Try to acquire a connection: if no connections are available, the thread will get blocked.
void	releaseConnection (T conn)
	Release an existing connection so it will get back into the pool and can be reused.

Protected Attributes
T_Groups	mGroups

Detailed Description

template<typename T, typename T_Group>
class QgsConnectionPool< T, T_Group >

Template class responsible for keeping a pool of open connections.

This is desired to avoid the overhead of creation of new connection everytime.

The methods are thread safe.

The connection pool has a limit on maximum number of concurrent connections (per server), once the limit is reached, the acquireConnection() function will block. All connections that have been acquired must be then released with releaseConnection() function.

When the connections are not used for some time, they will get closed automatically to save resources.

Member Typedef Documentation

template<typename T , typename T_Group >

typedef QMap<QString, T_Group*> QgsConnectionPool< T, T_Group >::T_Groups

Member Function Documentation

template<typename T , typename T_Group >

T QgsConnectionPool< T, T_Group >::acquireConnection ( const QString &  connInfo )

inline

Try to acquire a connection: if no connections are available, the thread will get blocked.

Returns

initialized connection or null on error

template<typename T , typename T_Group >

void QgsConnectionPool< T, T_Group >::releaseConnection ( T  conn )

inline

Release an existing connection so it will get back into the pool and can be reused.

Member Data Documentation

template<typename T , typename T_Group >

T_Groups QgsConnectionPool< T, T_Group >::mGroups

protected

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The documentation for this class was generated from the following file:

• /tmp/buildd/qgis-2.6.0+wheezy1/src/core/qgsconnectionpool.h