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May 28, 2017 06:51
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/* | |
* Copyright 2015, Google Inc. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are | |
* met: | |
* | |
* * Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* * Redistributions in binary form must reproduce the above | |
* copyright notice, this list of conditions and the following disclaimer | |
* in the documentation and/or other materials provided with the | |
* distribution. | |
* | |
* * Neither the name of Google Inc. nor the names of its | |
* contributors may be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
package org.eclipse.che.examples; | |
import io.grpc.Server; | |
import io.grpc.ServerBuilder; | |
import io.grpc.stub.StreamObserver; | |
import java.io.IOException; | |
import java.util.logging.Logger; | |
/** | |
* Server that manages startup/shutdown of a {@code Greeter} server. | |
*/ | |
public class HelloWorldServer { | |
private static final Logger logger = Logger.getLogger(HelloWorldServer.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"); | |
HelloWorldServer.this.stop(); | |
System.err.println("*** server shut down"); | |
} | |
}); | |
} | |
private void stop() { | |
if (server != null) { | |
server.shutdown(); | |
} | |
} | |
/** | |
* 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 { | |
final HelloWorldServer server = new HelloWorldServer(); | |
server.start(); | |
server.blockUntilShutdown(); | |
} | |
static class GreeterImpl extends GreeterGrpc.GreeterImplBase { | |
@Override | |
public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) { | |
HelloReply reply = HelloReply.newBuilder().setMessage("Hello " + req.getName()).build(); | |
responseObserver.onNext(reply); | |
responseObserver.onCompleted(); | |
} | |
} | |
} |
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