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
* @param format
	 *            the output format
	 * @param extensionID
	 *            the extension ID, which could be null if only one plugin
	 *            supports the output format
	 * @return the MIME type for the specific formatted supported by the
	 *         extension.
	 */
	public String getMIMEType( String format )
	{
		return helper.getMIMEType( format );
	}
	/**
	 * shuts down the report engine
	 */
	public void destroy( )
	{
		logger.fine( "ReportEngine.destroy" );
		rootScope = null;
		helper = null;
		if ( config != null )
		{
			IStatusHandler handler = config.getStatusHandler( );
			if ( handler != null )
			{
				handler.finish( );
			}
		}
		EngineLogger.stopEngineLogging( );
	}