| /* |
| * Copyright 2019 The gRPC Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package io.grpc.examples.experimental; |
| |
| import java.io.IOException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.logging.Logger; |
| |
| import io.grpc.Server; |
| import io.grpc.ServerBuilder; |
| import io.grpc.examples.helloworld.GreeterGrpc; |
| import io.grpc.examples.helloworld.HelloReply; |
| import io.grpc.examples.helloworld.HelloRequest; |
| import io.grpc.stub.ServerCallStreamObserver; |
| import io.grpc.stub.StreamObserver; |
| |
| /** |
| * Server that manages startup/shutdown of a {@code Greeter} server |
| * that enables compressed responses for only particular methods |
| */ |
| public class CompressingHelloWorldServerPerMethod { |
| private static final Logger logger = Logger.getLogger(CompressingHelloWorldServerPerMethod.class.getName()); |
| |
| private Server server; |
| |
| private void start() throws IOException { |
| /* The port on which the server should run */ |
| int port = 50051; |
| server = ServerBuilder.forPort(port) |
| .addService(new GreeterImpl()) |
| .build() |
| .start(); |
| logger.info("Server started, listening on " + port); |
| Runtime.getRuntime().addShutdownHook(new Thread() { |
| @Override |
| public void run() { |
| // Use stderr here since the logger may have been reset by its JVM shutdown hook. |
| System.err.println("*** shutting down gRPC server since JVM is shutting down"); |
| try { |
| CompressingHelloWorldServerPerMethod.this.stop(); |
| } catch (InterruptedException e) { |
| e.printStackTrace(System.err); |
| } |
| System.err.println("*** server shut down"); |
| } |
| }); |
| } |
| |
| private void stop() throws InterruptedException { |
| if (server != null) { |
| server.shutdown().awaitTermination(30, TimeUnit.SECONDS); |
| } |
| } |
| |
| /** |
| * Await termination on the main thread since the grpc library uses daemon threads. |
| */ |
| private void blockUntilShutdown() throws InterruptedException { |
| if (server != null) { |
| server.awaitTermination(); |
| } |
| } |
| |
| /** |
| * Main launches the server from the command line. |
| */ |
| public static void main(String[] args) throws IOException, InterruptedException { |
| CompressingHelloWorldServerPerMethod server = new CompressingHelloWorldServerPerMethod(); |
| server.start(); |
| server.blockUntilShutdown(); |
| } |
| |
| static class GreeterImpl extends GreeterGrpc.GreeterImplBase { |
| |
| @Override |
| public void sayHello(HelloRequest req, StreamObserver<HelloReply> plainResponseObserver) { |
| ServerCallStreamObserver<HelloReply> responseObserver = |
| (ServerCallStreamObserver<HelloReply>) plainResponseObserver; |
| /* This line by itself enables compression for the response */ |
| responseObserver.setCompression("gzip"); |
| HelloReply reply = HelloReply.newBuilder().setMessage("Hello " + req.getName()).build(); |
| responseObserver.onNext(reply); |
| responseObserver.onCompleted(); |
| } |
| } |
| } |