1 /* 2 * Copyright 2023 The gRPC Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package io.grpc.examples.gcpobservability; 18 19 import io.grpc.Grpc; 20 import io.grpc.InsecureServerCredentials; 21 import io.grpc.Server; 22 import io.grpc.examples.helloworld.GreeterGrpc; 23 import io.grpc.examples.helloworld.HelloReply; 24 import io.grpc.examples.helloworld.HelloRequest; 25 import io.grpc.gcp.observability.GcpObservability; 26 import io.grpc.stub.StreamObserver; 27 import java.io.IOException; 28 import java.util.concurrent.TimeUnit; 29 import java.util.logging.Logger; 30 31 /** 32 * Observability server that manages startup/shutdown of a {@code Greeter} server and generates 33 * logs, metrics and traces based on the configuration. 34 */ 35 public class GcpObservabilityServer { 36 private static final Logger logger = Logger.getLogger(GcpObservabilityServer.class.getName()); 37 38 private Server server; 39 start()40 private void start() throws IOException { 41 int port = 50051; 42 server = Grpc.newServerBuilderForPort(port, InsecureServerCredentials.create()) 43 .addService(new GreeterImpl()) 44 .build() 45 .start(); 46 logger.info("Server started, listening on " + port); 47 } 48 stop()49 private void stop() throws InterruptedException { 50 if (server != null) { 51 server.shutdown().awaitTermination(30, TimeUnit.SECONDS); 52 } 53 } 54 blockUntilShutdown()55 private void blockUntilShutdown() throws InterruptedException { 56 if (server != null) { 57 server.awaitTermination(); 58 } 59 } 60 61 /** 62 * Main launches the server from the command line. 63 */ main(String[] args)64 public static void main(String[] args) throws IOException, InterruptedException { 65 // Initialize observability 66 GcpObservability observability = GcpObservability.grpcInit(); 67 final GcpObservabilityServer server = new GcpObservabilityServer(); 68 server.start(); 69 70 Runtime.getRuntime().addShutdownHook(new Thread() { 71 @Override 72 public void run() { 73 System.err.println("*** shutting down gRPC server since JVM is shutting down"); 74 try { 75 server.stop(); 76 } catch (InterruptedException e) { 77 e.printStackTrace(System.err); 78 } 79 // Shut down observability 80 observability.close(); 81 System.err.println("*** server shut down"); 82 } 83 }); 84 85 server.blockUntilShutdown(); 86 } 87 88 static class GreeterImpl extends GreeterGrpc.GreeterImplBase { 89 90 @Override sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver)91 public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) { 92 HelloReply reply = HelloReply.newBuilder().setMessage("Hello " + req.getName()).build(); 93 responseObserver.onNext(reply); 94 responseObserver.onCompleted(); 95 } 96 } 97 } 98