add oracle connection pooling

src/providers/oracle/CMakeLists.txt

@@ -13,6 +13,7 @@ SET(ORACLE_SRCS
   qgsoracletablemodel.cpp
   qgsoraclecolumntypethread.cpp
   qgsoraclefeatureiterator.cpp
+  qgsoracleconnpool.cpp
 )
 
 SET(ORACLE_MOC_HDRS
@@ -23,6 +24,7 @@ SET(ORACLE_MOC_HDRS
   qgsoraclenewconnection.h
   qgsoracletablemodel.h
   qgsoraclecolumntypethread.h
+  qgsoracleconnpool.h
 )
 
 

src/providers/oracle/qgsoraclecolumntypethread.cpp

@@ -17,6 +17,7 @@ email                : jef at norbit dot de
 
 #include "qgsoraclecolumntypethread.h"
 #include "qgslogger.h"
+#include "qgsoracleconnpool.h"
 
 #include <QMetaType>
 
@@ -40,7 +41,7 @@ void QgsOracleColumnTypeThread::run()
   mStopped = false;
 
   QgsDataSourceURI uri = QgsOracleConn::connUri( mName );
-  QgsOracleConn *conn = QgsOracleConn::connectDb( uri );
+  QgsOracleConn *conn = QgsOracleConnPool::instance()->acquireConnection( uri.connectionInfo() );
   if ( !conn )
   {
     QgsDebugMsg( "Connection failed - " + uri.connectionInfo() );
@@ -92,5 +93,5 @@ void QgsOracleColumnTypeThread::run()
   emit progress( 0, 0 );
   emit progressMessage( tr( "Table retrieval finished." ) );
 
-  conn->disconnect();
+  QgsOracleConnPool::instance()->releaseConnection( conn );
 }

src/providers/oracle/qgsoracleconnpool.cpp

@@ -0,0 +1,35 @@
+/***************************************************************************
+    qgsoracleconnpool.cpp
+    ---------------------
+    begin                : November 2015
+    copyright            : (C) 2015 by Juergen E. Fischer
+    email                : jef at norbit dot de
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "qgsoracleconnpool.h"
+#include "qgsoracleconn.h"
+
+QgsOracleConnPool QgsOracleConnPool::sInstance;
+
+QgsOracleConnPool* QgsOracleConnPool::instance()
+{
+  return &sInstance;
+}
+
+QgsOracleConnPool::QgsOracleConnPool() : QgsConnectionPool<QgsOracleConn*, QgsOracleConnPoolGroup>()
+{
+  QgsDebugCall;
+}
+
+QgsOracleConnPool::~QgsOracleConnPool()
+{
+  QgsDebugCall;
+}
+

src/providers/oracle/qgsoracleconnpool.h

@@ -0,0 +1,84 @@
+/***************************************************************************
+    qgsoracleonnpool.h
+    ---------------------
+    begin                : November 2015
+    copyright            : (C) 2015 by Juergen Fischer
+    email                : jef at norbit dot de
+ ***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef QGSORACLECONNPOOL_H
+#define QGSORACLECONNPOOL_H
+
+#include "qgsconnectionpool.h"
+#include "qgsoracleconn.h"
+
+
+inline QString qgsConnectionPool_ConnectionToName( QgsOracleConn* c )
+{
+  return c->connInfo();
+}
+
+inline void qgsConnectionPool_ConnectionCreate( QgsDataSourceURI uri, QgsOracleConn*& c )
+{
+  c = QgsOracleConn::connectDb( uri );
+}
+
+inline void qgsConnectionPool_ConnectionDestroy( QgsOracleConn* c )
+{
+  c->disconnect(); // will delete itself
+}
+
+inline void qgsConnectionPool_InvalidateConnection( QgsOracleConn* c )
+{
+  Q_UNUSED( c );
+}
+
+inline bool qgsConnectionPool_ConnectionIsValid( QgsOracleConn* c )
+{
+  Q_UNUSED( c );
+  return true;
+}
+
+
+class QgsOracleConnPoolGroup : public QObject, public QgsConnectionPoolGroup<QgsOracleConn*>
+{
+    Q_OBJECT
+
+  public:
+    explicit QgsOracleConnPoolGroup( QString name ) : QgsConnectionPoolGroup<QgsOracleConn*>( name ) { initTimer( this ); }
+
+  protected slots:
+    void handleConnectionExpired() { onConnectionExpired(); }
+    void startExpirationTimer() { expirationTimer->start(); }
+    void stopExpirationTimer() { expirationTimer->stop(); }
+
+  protected:
+    Q_DISABLE_COPY( QgsOracleConnPoolGroup )
+
+};
+
+/** Oracle connection pool - singleton */
+class QgsOracleConnPool : public QgsConnectionPool<QgsOracleConn*, QgsOracleConnPoolGroup>
+{
+  public:
+    static QgsOracleConnPool* instance();
+
+  protected:
+    Q_DISABLE_COPY( QgsOracleConnPool )
+
+  private:
+    QgsOracleConnPool();
+    ~QgsOracleConnPool();
+
+    static QgsOracleConnPool sInstance;
+};
+
+
+#endif // QGSORACLECONNPOOL_H

src/providers/oracle/qgsoraclefeatureiterator.cpp

@@ -15,6 +15,7 @@
 
 #include "qgsoraclefeatureiterator.h"
 #include "qgsoracleprovider.h"
+#include "qgsoracleconnpool.h"
 
 #include "qgslogger.h"
 #include "qgsmessagelog.h"
@@ -26,7 +27,7 @@ QgsOracleFeatureIterator::QgsOracleFeatureIterator( QgsOracleFeatureSource* sour
     : QgsAbstractFeatureIteratorFromSource<QgsOracleFeatureSource>( source, ownSource, request )
     , mRewind( false )
 {
-  mConnection = QgsOracleConn::connectDb( mSource->mUri.connectionInfo() );
+  mConnection = QgsOracleConnPool::instance()->acquireConnection( mSource->mUri.connectionInfo() );
   if ( !mConnection )
   {
     close();
@@ -269,7 +270,7 @@ bool QgsOracleFeatureIterator::close()
     mQry.finish();
 
   if ( mConnection )
-    mConnection->disconnect();
+    QgsOracleConnPool::instance()->releaseConnection( mConnection );
   mConnection = 0;
 
   iteratorClosed();

src/providers/oracle/qgsoraclenewconnection.cpp

@@ -23,6 +23,7 @@
 #include "qgscontexthelp.h"
 #include "qgsdatasourceuri.h"
 #include "qgsoracletablemodel.h"
+#include "qgsoracleconnpool.h"
 
 QgsOracleNewConnection::QgsOracleNewConnection( QWidget *parent, const QString& connName, Qt::WindowFlags fl )
     : QDialog( parent, fl ), mOriginalConnName( connName )
@@ -138,7 +139,7 @@ void QgsOracleNewConnection::on_btnConnect_clicked()
   if ( !txtOptions->text().isEmpty() )
     uri.setParam( "dboptions", txtOptions->text() );
 
-  QgsOracleConn *conn = QgsOracleConn::connectDb( uri );
+  QgsOracleConn *conn = QgsOracleConnPool::instance()->acquireConnection( uri.connectionInfo() );
 
   if ( conn )
   {
@@ -148,7 +149,7 @@ void QgsOracleNewConnection::on_btnConnect_clicked()
                               tr( "Connection to %1 was successful" ).arg( txtDatabase->text() ) );
 
     // free connection resources
-    conn->disconnect();
+    QgsOracleConnPool::instance()->releaseConnection( conn );
   }
   else
   {

src/providers/oracle/qgsoracleprovider.cpp

@@ -33,6 +33,7 @@
 #include "qgsoraclesourceselect.h"
 #include "qgsoracledataitems.h"
 #include "qgsoraclefeatureiterator.h"
+#include "qgsoracleconnpool.h"
 
 #include <QSqlRecord>
 #include <QSqlField>
@@ -69,7 +70,7 @@ QgsOracleProvider::QgsOracleProvider( QString const & uri )
   mRequestedGeomType = mUri.wkbType();
   mUseEstimatedMetadata = mUri.useEstimatedMetadata();
 
-  mConnection = QgsOracleConn::connectDb( mUri );
+  mConnection = QgsOracleConnPool::instance()->acquireConnection( mUri.connectionInfo() );
   if ( !mConnection )
   {
     return;
@@ -210,7 +211,7 @@ QgsAbstractFeatureSource *QgsOracleProvider::featureSource() const
 void QgsOracleProvider::disconnectDb()
 {
   if ( mConnection )
-    mConnection->disconnect();
+    QgsOracleConnPool::instance()->releaseConnection( mConnection );
   mConnection = 0;
 }
 
@@ -2973,7 +2974,6 @@ QGISEXTERN bool deleteLayer( const QString& uri, QString& errCause )
   if ( !conn )
   {
     errCause = QObject::tr( "Connection to database failed" );
-    conn->disconnect();
     return false;
   }
 

src/providers/oracle/qgsoraclesourceselect.cpp

@@ -439,7 +439,6 @@ QgsOracleSourceSelect::~QgsOracleSourceSelect()
   if ( mColumnTypeThread )
   {
     mColumnTypeThread->stop();
-    mColumnTypeThread->wait();
     finishList();
   }
 

src/providers/oracle/qgsoraclesourceselect.h

@@ -22,6 +22,7 @@
 #include "qgsdbfilterproxymodel.h"
 #include "qgsoracletablemodel.h"
 #include "qgscontexthelp.h"
+#include "qgsoracleconnpool.h"
 
 #include <QMap>
 #include <QPair>
@@ -56,7 +57,7 @@ class QgsOracleSourceSelectDelegate : public QItemDelegate
     void setConnectionInfo( const QgsDataSourceURI& connInfo ) { mConnInfo = connInfo; }
 
   protected:
-    void setConn( QgsOracleConn *conn ) const { if ( mConn ) mConn->disconnect();  mConn = conn; }
+    void setConn( QgsOracleConn *conn ) const { if ( mConn ) QgsOracleConnPool::instance()->releaseConnection( mConn ); mConn = conn; }
 
     QgsOracleConn* conn() const
     {

src/providers/oracle/qgsoracletablecache.cpp

@@ -274,7 +274,7 @@ void _testTableCache()
   // fetch
 
   QgsDataSourceURI uri = QgsOracleConn::connUri( connName );
-  QgsOracleConn* c = QgsOracleConn::connectDb( uri.connectionInfo() );
+  QgsOracleConn* c = QgsOracleConnectionPool::instance()->acquireConnection( uri.connectionInfo() );
   if ( !c )
     return;
 
@@ -289,7 +289,7 @@ void _testTableCache()
     c->retrieveLayerTypes( layerProperty, useEstimated, onlyExisting );
   }
 
-  c->disconnect();
+  QgsOracleConnPool::instance()->releaseConnection( c );
 
   // save