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
IRenderOption defaultOptions = (IRenderOption) configs
				.get( IEngineConfig.DEFAULT_RENDER_OPTION );
		if ( defaultOptions == null )
		{
			defaultOptions = (IRenderOption) configs
					.get( IRenderOption.OUTPUT_FORMAT_HTML );
		}
		if ( defaultOptions != null )
		{
			options.putAll( defaultOptions.getOptions( ) );
		}
		
		IRenderOption formatOptions = (IRenderOption) configs.get( format );
		if ( formatOptions != null )
		{
			options.putAll( formatOptions.getOptions( ) );
		}
		
		if ( emitterID != null )
		{
			IRenderOption emitterOptions = (IRenderOption) configs
					.get( emitterID );
			if ( emitterOptions != null )
			{
				options.putAll( emitterOptions.getOptions( ) );
			}
		}