Suppose you are using Spring Boot and you have a REST controller:
@RestController
public class HelloRestController {
@PostMapping
public String hello(...) {
...
}
}At some point you need to connect the gRPC to the project without disabling REST controller. The gRPC code looks something like this:
@Service
public class GrpcServer {
@PostConstruct
public void start(BindableService service) throws Exception {
Server server = ServerBuilder
.forPort(9090)
.addService(new DataGrpcService())
.build();
server.start();
server.awaitTermination();
}
}public class DataGrpcService extends DataServiceGrpc.DataServiceImplBase {
...
}Then you find out that you can’t start REST server together with gRPC. gRPC will start, but REST will not.
The problem is that gRPC is blocking further code execution. To bypass the blocking, you need to remove awaitTermination() method:
@Service
public class GrpcServer {
@PostConstruct
public void start(BindableService service) throws Exception {
Server server = ServerBuilder
.forPort(9090)
.addService(new DataGrpcService())
.build();
server.start();
}
}If you still have any questions, feel free to ask me in the comments under this article, or write me on promark33@gmail.com.