events = getEvents(canalInstance.getEventStore(), start, batchSize, timeout, unit);
if (CollectionUtils.isEmpty(events.getEvents())) {
logger.debug("get successfully, clientId:{} batchSize:{} but result is null", new Object[] {
clientIdentity.getClientId(), batchSize });
return new Message(-1, new ArrayList<Entry>()); // 返回空包，避免生成batchId，浪费性能
} else {
// 记录到流式信息
Long batchId = canalInstance.getMetaManager().addBatch(clientIdentity, events.getPositionRange());
// 直接提交ack
ack(clientIdentity, batchId);
List<Entry> entrys = Lists.transform(events.getEvents(), new Function<Event, Entry>() {
public Entry apply(Event input) {
return input.getEntry();
}
});
logger.info(
"get successfully, clientId:{} batchSize:{} real size is {} and result is [batchId:{} , position:{}]",
new Object[] { clientIdentity.getClientId(), batchSize, entrys.size(), batchId,
events.getPositionRange() });
return new Message(batchId, entrys);
}
}
}