protected String computeMetricName(Message<?> message) {
		return nameExpression.getValue(evaluationContext, message, CharSequence.class).toString();
	}
Abstract support class for authoring metrics oriented handlers. Provides support for
dynamically choosing the name of the counter to contribute to.

@author Eric Bottard
spring-xd-analytics/src/main/java/org/springframework/xd/analytics/metrics/integration/AbstractMetricHandler.java