Hi,
I am using protobuf for a project, and I've run into an interesting case,
which I've had no luck finding a standard solution to. For the record, I'm
using the Java APIs to interact with my messages
My project has several messages defined, a few of which have similar fields
(for example, two of them have a required text field with index 1). The
problem I'm running into is that if I erroneously pass the byte array form
of one message to a builder of the other message, it will happily parse it
without any exceptions or other issues. (Apparently
InvalidProto....Exception is thrown only is the array is completely invalid
as a protobuf message of any type, and does not indicate anything else)
I have tried checking "isInitialized", but because they both have the same
required fields at the same indexes, it doesn't have an error.
I considered changing the indexes or something like that, but that depends
on every person who works on this project knowing about and respecting that
convention - which doesn't seem like a sustainable solution. I also thought
of checking the unknown fields, but one of the reasons I chose protobuf was
for its forward and backwards compatibility - and I believe that the
unknown filed list will be (validly) non-empty if I add a field down the
road and an old version of the project receives a new version of the
message.
The only other thing I can think to do is to add a field in my messages
which indicates the message - is this my best option, or am I missing
something in the standard libraries which handles this?
Thanks!
Example:
message Message1 {
required string field1 = 1;
optional string field2 = 2;
}
message Message2 {
required string field1 = 1;
optional int32 field2 = 2;
}
public void parseMessage1(byte[] protobuf){
try {
Message1 message = Messag1e.parseFrom(protobuf);
if(message.isInitialized()){
//Do some stuff
}else{
//Never get here
}
} catch (InvalidProtocolBufferException e) {
//Not thrown
}
}
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