Bug 165188 logging per report
Setting up a dedicated (birt) report server, which serves all our web apps, leads to a logging desaster. Birtegine logs all messages to one file. There's no info which rptdesign caused the logmessage or who (e.g. user) caused the logmessage. Retrieving who/which rpt caused some logmessage is not possible! There are two possible solutions: (a) prefixing each logmessage with a userdefineable message (task.setLogprefix("myprefix")) (b) set an outputstream for each task (task.setLoggingOutputStream(outputstream)) to split the huge logfile to many small pieces.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
}
	public boolean getCancelFlag( )
	{
		return cancelFlag;
	}
	public void setErrorHandlingOption( int option )
	{
		if ( option == CANCEL_ON_ERROR )
		{
			executionContext.setCancelOnError( true );
		}
		else
		{
			executionContext.setCancelOnError( false );
		}
	}
	/**
	 * class used to visit all parameters
	 * 
	 */
	static abstract class ParameterVisitor
	{
		boolean visitParametersInGroup( ParameterGroupHandle group, Object value )
		{
			SlotHandle parameters = group.getParameters( );
			Iterator iter = parameters.iterator( );
			while ( iter.hasNext( ) )
			{
				Object param = iter.next( );
				if ( param instanceof CascadingParameterGroupHandle )