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/ReportEngine.java
InputStream designStream ) throws EngineException
	{
		logger.log( Level.FINE,
				"ReportEngine.openReportDesign: name={0}, designStream={1} ", 
				new Object[] {name, designStream} );
		return helper.openReportDesign( name, designStream );
	}
	/**
	 * creates an engine task for running and rendering report directly to
	 * output format
	 * 
	 * @param reportRunnable
	 *            the runnable report design object
	 * @return a run and render report task
	 */
	public IRunAndRenderTask createRunAndRenderTask(
			IReportRunnable reportRunnable )
	{
		logger.log( Level.FINE,
				"ReportEngine.createRunAndRenderTask: reportRunnable={0} ", reportRunnable );
		return helper.createRunAndRenderTask( reportRunnable );
	}
	/**
	 * creates an engine task for obtaining report parameter definitions
	 * 
	 * @param reportRunnable
	 *            the runnable report design object
	 * @return a run and render report task
	 */
	public IGetParameterDefinitionTask createGetParameterDefinitionTask(