[jira] [Created] (MESOS-2638) Add support for Optional parameters to protobuf handlers to wrap option fields

["Joris Van Remoortere (JIRA)" <ji...@apache.org>]

Joris Van Remoortere created MESOS-2638:
-------------------------------------------

             Summary: Add support for Optional parameters to protobuf handlers to wrap option fields
                 Key: MESOS-2638
                 URL: https://issues.apache.org/jira/browse/MESOS-2638
             Project: Mesos
          Issue Type: Improvement
          Components: libprocess
            Reporter: Joris Van Remoortere


We currently don't have a way to install a protobuf handler for an option field where the handler takes an Optional parameter of the 'option' field in the protobuf message. The goal is to be able to do:
{code:title=example|borderStyle=solid}
message Person {
  required string name = 1;
  option uint32_t age = 2; 
}

void person(const std::string& name, const Option<uint32_t>& age) 
{
  if (age.isKnown()) {
    ...
  }
}

install<Person>(person,
  &Person::name,
  &Person::age); 
{code}
We can then use this to test whether the field was provided, as opposed to capturing a reference to a default constructed value of the the type.



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