@Override
	public void reset(String name, String fieldName) {
		FieldValueCounter counter = getOrCreate(name);
		Map<String, Double> data = counter.getFieldValueCount();
		if (data.containsKey(fieldName)) {
			data.put(fieldName, 0D);
		}
	}
Memory backed implementation of FieldValueCounterRepository that uses a ConcurrentMap

@author Mark Pollack
spring-xd-analytics/src/main/java/org/springframework/xd/analytics/metrics/memory/InMemoryFieldValueCounterRepository.java