When EventScanner running, it will first find the timeout event and save it
into timeoutRepository.
And then, it calls `abortTimeoutEvents` to get the events that just save.
Maybe it would be better if we merged these two steps. If i follow that，is it
will destroy the principle that a function only completes one task？
```Java
private void pollEvents() {
scheduler.scheduleWithFixedDelay(
() -> {
updateTimeoutStatus();
findTimeoutEvents();
abortTimeoutEvents();
saveUncompensatedEventsToCommands();
compensate();
updateCompensatedCommands();
deleteDuplicateSagaEndedEvents();
updateTransactionStatus();
},
0,
eventPollingInterval,
MILLISECONDS);
}
```
[ Full content available at:
https://github.com/apache/incubator-servicecomb-saga/issues/309 ]
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