private Delta<?> calculateDelta(Metric<?> value) {
long delta = value.getValue().longValue();
Long old = this.counts.replace(value.getName(), delta);
if (old != null) {
delta = delta - old;
} else {
this.counts.putIfAbsent(value.getName(), delta);
}
return new Delta<Long>(value.getName(), delta, value.getTimestamp());
}
@Override
public void set(String group, Collection<Metric<?>> values) {
String prefix = group;
if (!prefix.endsWith(".")) {
prefix = prefix + ".";
}
for (Metric<?> metric : values) {
if (!metric.getName().startsWith(prefix)) {
metric =
new Metric<Number>(prefix + metric.getName(), metric.getValue(), metric.getTimestamp());
}
set(metric);
}
this.groups.add(group);
}