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| 1 | +/* |
| 2 | + * Copyright 2018 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.servlet.examples.helloworld; |
| 18 | + |
| 19 | +import io.grpc.stub.StreamObserver; |
| 20 | +import io.grpc.examples.helloworld.GreeterGrpc; |
| 21 | +import io.grpc.examples.helloworld.HelloReply; |
| 22 | +import io.grpc.examples.helloworld.HelloRequest; |
| 23 | +import io.grpc.servlet.ServletAdapter; |
| 24 | +import io.grpc.servlet.ServletServerBuilder; |
| 25 | +import java.io.IOException; |
| 26 | +import javax.servlet.annotation.WebServlet; |
| 27 | +import javax.servlet.http.HttpServlet; |
| 28 | +import javax.servlet.http.HttpServletRequest; |
| 29 | +import javax.servlet.http.HttpServletResponse; |
| 30 | + |
| 31 | +/** |
| 32 | + * A servlet that hosts a gRPC server over HTTP/2 and shares the resource URI for the normal servlet |
| 33 | + * clients over HTTP/1.0+. |
| 34 | + * |
| 35 | + * <p>For creating a servlet that solely serves gRPC services, do not follow this example, simply |
| 36 | + * extend or register a {@link io.grpc.servlet.GrpcServlet} instead. |
| 37 | + */ |
| 38 | +@WebServlet(urlPatterns = {"/helloworld.Greeter/SayHello"}, asyncSupported = true) |
| 39 | +public class HelloWorldServlet extends HttpServlet { |
| 40 | + private static final long serialVersionUID = 1L; |
| 41 | + |
| 42 | + private final ServletAdapter servletAdapter = |
| 43 | + new ServletServerBuilder().addService(new GreeterImpl()).buildServletAdapter(); |
| 44 | + |
| 45 | + private static final class GreeterImpl extends GreeterGrpc.GreeterImplBase { |
| 46 | + GreeterImpl() {} |
| 47 | + |
| 48 | + @Override |
| 49 | + public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) { |
| 50 | + HelloReply reply = HelloReply.newBuilder().setMessage("Hello " + req.getName()).build(); |
| 51 | + responseObserver.onNext(reply); |
| 52 | + responseObserver.onCompleted(); |
| 53 | + } |
| 54 | + } |
| 55 | + |
| 56 | + @Override |
| 57 | + protected void doGet(HttpServletRequest request, HttpServletResponse response) |
| 58 | + throws IOException { |
| 59 | + response.setContentType("text/html"); |
| 60 | + response.getWriter().println("<p>Hello World!</p>"); |
| 61 | + } |
| 62 | + |
| 63 | + @Override |
| 64 | + protected void doPost(HttpServletRequest request, HttpServletResponse response) |
| 65 | + throws IOException { |
| 66 | + if (ServletAdapter.isGrpc(request)) { |
| 67 | + servletAdapter.doPost(request, response); |
| 68 | + } else { |
| 69 | + response.setContentType("text/html"); |
| 70 | + response.getWriter().println("<p>Hello non-gRPC client!</p>"); |
| 71 | + } |
| 72 | + } |
| 73 | + |
| 74 | + @Override |
| 75 | + public void destroy() { |
| 76 | + servletAdapter.destroy(); |
| 77 | + super.destroy(); |
| 78 | + } |
| 79 | +} |
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