private void doRun(final Collection<LongPollingClient> clients) {
            for (Iterator<LongPollingClient> iter = clients.iterator(); iter.hasNext();) {
                LongPollingClient client = iter.next();
                iter.remove();
                client.sendResponse(Collections.singletonList(groupKey));
                LOG.info("send response with the changed group,ip={}, group={}, changeTime={}", client.ip, groupKey, changeTime);
            }
        }
Instantiates a new Data change task.

@param groupKey the group key
shenyu-admin/src/main/java/org/apache/shenyu/admin/listener/http/HttpLongPollingDataChangedListener.java