/** {@inheritDoc} */
@Override
public synchronized Iterable<String> getGroupNames() {
Collection<String> res = new HashSet<>();
for (HadoopCounter counter : cntrs.values()) res.add(counter.group());
return res;
}
/**
* Returns counters iterator for specified group.
*
* @param grpName Name of the group to iterate.
* @return Counters iterator.
*/
public Iterator<Counter> iterateGroup(String grpName) {
Collection<Counter> grpCounters = new ArrayList<>();
for (HadoopLongCounter counter : cntrs.values()) {
if (grpName.equals(counter.group())) grpCounters.add(new HadoopV2Counter(counter));
}
return grpCounters.iterator();
}