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
{
			Map.Entry entry = (Map.Entry) iter.next( );
			if ( entry.getKey( ) != null )
			{
				scope
						.put( entry.getKey( ).toString( ), scope, entry
								.getValue( ) );
			}
		}
	}
	/**
	 * Change the log level to newLevel
	 * 
	 * @param newLevel -
	 *            new log level
	 */
	public void changeLogLevel( Level newLevel )
	{
		EngineLogger.changeLogLevel( newLevel );
		logger.setLevel( newLevel );
	}
	/**
	 * returns the engine configuration object
	 * 
	 * @return the engine configuration object
	 */
	public EngineConfig getConfig( )
	{
		return config;
	}