public ConnectionTrackingInterceptor(ConnectionInterceptor next,
    String key,
    ConnectionTracker connectionTracker) 
{
        this.next = next;
        this.key = key;
        this.connectionTracker = connectionTracker;
}

 public  void enter(Collection connectionInfos) throws ResourceException 
{
        for (Iterator i = connectionInfos.iterator(); i.hasNext();) {
            ConnectionInfo connectionInfo = (ConnectionInfo) i.next();
            next.getConnection(connectionInfo);
        }
}

 public  void exit(Collection connectionInfos) throws ResourceException 
{
        for (Iterator i = connectionInfos.iterator(); i.hasNext();) {
            ConnectionInfo connectionInfo = (ConnectionInfo) i.next();
            if (connectionInfo.isUnshareable()) {
                //if one is, they all are
                return;
            }
            ManagedConnectionInfo managedConnectionInfo = connectionInfo.getManagedConnectionInfo();
            ManagedConnection managedConnection = managedConnectionInfo.getManagedConnection();
            if (managedConnection instanceof DissociatableManagedConnection
                    && managedConnectionInfo.isFirstConnectionInfo(connectionInfo)) {
                int size = connectionInfos.size();
                i.remove();
                assert size - 1 == connectionInfos.size();
                ((DissociatableManagedConnection) managedConnection).dissociateConnections();
                managedConnectionInfo.clearConnectionHandles();
                //todo this needs some kind of check so cx isn't returned more than once
                //in case dissociate calls connection closed event and returns cx to pool.
                returnConnection(connectionInfo, ConnectionReturnAction.RETURN_HANDLE);
            }
        }
}

 public  void getConnection(ConnectionInfo connectionInfo) throws ResourceException 
{
        connectionTracker.setEnvironment(connectionInfo, key);
        next.getConnection(connectionInfo);
        connectionTracker.handleObtained(this, connectionInfo);
}

called by: GenericConnectionManager.allocateConnection, GenericConnectionManager.associateConnection, and enter. in: connectionInfo is non-null, and has non-null ManagedConnectionInfo with non-null managedConnectionfactory. connection handle may or may not be null. out: connectionInfo has non-null connection handle, non null ManagedConnectionInfo with non-null ManagedConnection and GeronimoConnectionEventListener. connection tracker has been notified of handle-managed connection association.

 public  void returnConnection(ConnectionInfo connectionInfo,
    ConnectionReturnAction connectionReturnAction) 
{
        connectionTracker.handleReleased(this, connectionInfo);
        next.returnConnection(connectionInfo, connectionReturnAction);
}

called by: GeronimoConnectionEventListener.connectionClosed, GeronimoConnectionEventListener.connectionErrorOccurred, exit in: handle has already been dissociated from ManagedConnection. connectionInfo not null, has non-null ManagedConnectionInfo, ManagedConnectionInfo has non-null ManagedConnection handle can be null if called from error in ManagedConnection in pool. out: connectionTracker has been notified, ManagedConnectionInfo null.