REST Java web service using protobuf [closed]

Question

I want to implement a REST web service using Java & protobuf.

Can anyone point me to where to start or how to implement it? Any good tutorial??

Thanks!

Answer 1

The below two article shows you exactly this

1. Using JAX-RS with Protocol Buffers for high-performance REST APIs
2. RESTful Representation with Google Protocol Buffers and Jersey

Answer 2

You can see inside the post how we can create a JX-RS web service which is producing Google protocol Buffer in response. Source code is available at my blog

what I am doing is converting the protocol buffer object into byte array from server side and sending is array via service: Service code is below , populating object and putting it in response.

UserDTO.User user = UserDTO.User.newBuilder(). //protocol buffer object
          setSessionId(id).
          setName("l070020").
          build();
return Response.ok(user.toByteArray(),MediaType.APPLICATION_OCTET_STREAM).status(200).build();

Protocol buffer object has ability to parse and populate populate the protocol buffer object via stream. So i am using by stream for data communication. On client side I am making connection to web service

HttpGet request = new HttpGet("http://localhost:8080/maven.work/service/mainServices/get_user");
request.addHeader("accept","application/octet-stream");
HttpResponse response = httpClient.execute(request);

Protocol buffer has built in method to parse stream, below I am parsing stream from the response

User user = User.parseFrom(response.getEntity().getContent());

Similarly you can send the protocol buffer object in the form of byte array to server and server can get it from HTTP Servlet Request stream and parse it same like the client is doing.