cstarc commented on issue #1097:
URL: https://github.com/apache/incubator-brpc/issues/1097#issuecomment-619508088
> 这个是需要用户实现的callback，返回值是自己填的啊。如果是连接断了的话，应该是on_error会被调用
返回值自己填的清楚，但这个是返回哪里？ 客户端怎么通过函数或变量获取这个返回值？
找了下代码on_received_messages 没有处理返回值
```
class MessageBatcher {
void flush() {
if (_size > 0 && _s->_options.handler != NULL) {
_s->_options.handler->on_received_messages(
_s->id(), _storage, _size);
}
for (size_t i = 0; i < _size; ++i) {
delete _storage[i];
}
_size = 0;
}
```
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