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
{
					if ( !visitCascadingParamterGroup(
							(CascadingParameterGroupHandle) param, value ) )
					{
						return false;
					}
				}
				else if ( param instanceof ParameterGroupHandle )
				{
					if ( !visitParameterGroup( (ParameterGroupHandle) param,
							value ) )
					{
						return false;
					}
				}
				else if ( param instanceof ScalarParameterHandle )
				{
					if ( !visitScalarParameter( (ScalarParameterHandle) param,
							value ) )
					{
						return false;
					}
				}
			}
			return true;
		}
		boolean visitCascadingParamterGroup(
				CascadingParameterGroupHandle group, Object value )
		{
			return visitParameterGroup( group, value );