Examples of javax.sql.ConnectionEventListener

javax.sql.ConnectionEventListener

A ConnectionEventListener is an object that registers to receive events generated by a PooledConnection.
The ConnectionEventListener interface is implemented by a connection pooling component. A connection pooling component will usually be provided by a JDBC driver vendor, or another system software vendor. A ConnectionEventListener is notified by a JDBC driver when an application is finished using its Connection object. This event occurs after the application calls close on its representation of the PooledConnection. A ConnectionEventListener is also notified when a Connection error occurs due to the fact that the PooledConnection is unfit for future use---the server has crashed, for example. The listener is notified, by the JDBC driver, just before the driver throws an SQLException to the application using the PooledConnection.

     */
    private void subtestPooledRemoveListenerOnClose(final PooledConnection pc) throws SQLException
    {
        
        final int[] count1 = new int[1];
        pc.addConnectionEventListener(new ConnectionEventListener() {


            /**
             * Mimic a pool handler that removes the listener during
             * a logical close.
             */
            public void connectionClosed(ConnectionEvent event) {
                PooledConnection pce = (PooledConnection) event.getSource();
                assertSame(pc, pce);
                count1[0]++;
                pce.removeConnectionEventListener(this);
            }


            public void connectionErrorOccurred(ConnectionEvent event) {
            }
            
        });
        
        // and have another listener to ensure removing one leaves
        // the other working and intact.
        final int[] count2 = new int[1];
        pc.addConnectionEventListener(new ConnectionEventListener() {


            /**
             * Mimic a pool handler that closes the PooledConnection
             * (say it no longer needs it, pool size being reduced)
             */

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        // has been triggered, number of times added listeners have been
        // triggered }.
        final int[] count = new int[2];


        // Register the main listener
        pc.addConnectionEventListener(new ConnectionEventListener() {


            public void connectionClosed(ConnectionEvent event) {
                assertSame(pc, event.getSource());
                count[0]++;
                // Register a new listener
                pc.addConnectionEventListener(new ConnectionEventListener() {
                    public void connectionClosed(ConnectionEvent e) {
                        assertSame(pc, e.getSource());
                        count[1]++;
                    }
                    public void connectionErrorOccurred(ConnectionEvent e) {

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    }


    private void fireCloseEvent() {
        if (log.isDebugEnabled()) { log.debug("notifying " + connectionEventListeners.size() + " connectionEventListeners(s) about closing of " + this); }
        for (int i = 0; i < connectionEventListeners.size(); i++) {
            ConnectionEventListener connectionEventListener = connectionEventListeners.get(i);
            connectionEventListener.connectionClosed(new ConnectionEvent((PooledConnection) delegate));
        }
    }

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        userConnection = null;


        release();


        for (int i = 0; i < listeners.size(); i++) {
            ConnectionEventListener connectionEventListener =
                (ConnectionEventListener) listeners.get(i);


            connectionEventListener.connectionClosed(event);
        }
    }

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        ConnectionEvent event = new ConnectionEvent(this, e);


        release();


        for (int i = 0; i < listeners.size(); i++) {
            ConnectionEventListener connectionEventListener =
                (ConnectionEventListener) listeners.get(i);


            connectionEventListener.connectionErrorOccurred(event);
        }
    }

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  void fireConnectionClosed() {
    ConnectionEvent evt = null;
    // Copy the listener list so the listener can remove itself during this method call
    ConnectionEventListener[] local = (ConnectionEventListener[]) connectionListeners.toArray(new ConnectionEventListener[connectionListeners.size()]);
    for (int i = 0; i < local.length; i++) {
      ConnectionEventListener listener = local[i];
      if (evt == null) {
        evt = createConnectionEvent(null);
      }
      listener.connectionClosed(evt);
    }
  }

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  void fireConnectionFatalError(SQLException e) {
    ConnectionEvent evt = null;
    // Copy the listener list so the listener can remove itself during this method call
    ConnectionEventListener[] local = (ConnectionEventListener[])connectionListeners.toArray(new ConnectionEventListener[connectionListeners.size()]);
    for (int i = 0; i < local.length; i++) {
      ConnectionEventListener listener = local[i];
      if (evt == null) {
        evt = createConnectionEvent(e);
      }
      listener.connectionErrorOccurred(evt);
    }
  }

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      ConnectionEvent errorEvent = new ConnectionEvent(this, exception);


      for (Enumeration e = eventListener.elements();
         e.hasMoreElements(); )
      {
        ConnectionEventListener l =
          (ConnectionEventListener)e.nextElement();
        l.connectionErrorOccurred(errorEvent);
      }
    }
  }

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      ConnectionEvent closeEvent = new ConnectionEvent(this);


      for (Enumeration e = eventListener.elements();
         e.hasMoreElements(); )
      {
        ConnectionEventListener l =
          (ConnectionEventListener)e.nextElement();
        l.connectionClosed(closeEvent);
      }
    }
  }

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     * ConnectionEventListener.connectionClosed() is called.
     */
    private void subtestPooledReuseOnClose(final PooledConnection pc) throws SQLException
    {
      final Connection[] newConn = new Connection[1];
      pc.addConnectionEventListener(new ConnectionEventListener() {


        /**
         * Mimic a pool handler that returns the PooledConnection
         * to the pool and then reallocates it to a new logical connection.
         */

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