feng-y edited a comment on issue #1243:
URL: https://github.com/apache/incubator-brpc/issues/1243#issuecomment-693219844
一个不太靠谱的基于future的实现
callback 里面设置 future
```
void HandleEchoResponse(
brpc::Controller* cntl,
example::EchoResponse* response,
std::shared_ptr<std::promise<bool>> waiter) {
waiter->set_value(true);
}
```
等待的时候不join， 等future ，如果futre 不成功就 cancel 请求
```
std::shared_ptr<std::promise<bool>>
waiter(std::make_shared<std::promise<bool>>());
// Because `done'(last parameter) is NULL, this function waits until
// the response comes back or error occurs(including timedout).
google::protobuf::Closure* done = brpc::NewCallback(
&HandleEchoResponse, &cntl, &response, waiter);
auto call_id = cntl.call_id();
stub.Echo(&cntl, &request, &response, done);
LOG(INFO) << "waiting Join:" << errno << ", " << EINVAL;
// brpc::Join(call_id);
if (waiter->get_future().wait_for(std::chrono::microseconds(1)) !=
std::future_status::ready) {
LOG(INFO) << "timeout";
brpc::StartCancel(call_id);
} else {
.......
}
```
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