@ModuleOption("the expression to be evaluated for the log content; use '#root' to log the full message")
	public void setExpression(String expression) {
		this.expression = expression;
	}
Captures options for the {@code log} sink module.

@author Eric Bottard
@author Gary Russell
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/LogSinkOptionsMetadata.java