AbelanaGrpcServer.java

/*
 * Copyright 2015 Google, Inc. All Rights Reserved.
 *
 * 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 com.examples.abelanav2.grpc;

import com.examples.abelanav2.BackendConstants;
import io.grpc.ServerImpl;
import io.grpc.ServerInterceptors;
import io.grpc.transport.netty.NettyServerBuilder;

import java.util.logging.Logger;

/**
 * The Abelana GRPC server main class.
 */
public final class AbelanaGrpcServer {
  /**
   * Logger.
   */
  private static final Logger LOGGER = Logger.getLogger(AbelanaGrpcServer.class.getName());

  /**
   * The server implentation.
   */
  private ServerImpl server;

  /**
   * Constructor for Abelana GRPC server.
   */
  private AbelanaGrpcServer() {
  }

  /**
   * Main launches the server from the command line.
   * @param args command line arguments
   * @throws Exception runtime exception
   */
  public static void main(final String[] args) throws Exception {
    final AbelanaGrpcServer server = new AbelanaGrpcServer();
    server.start();
  }

  /**
   * Starts the Abelana GRPC server.
   * @throws Exception runtime Abelana GRPC server exception
   */
  private void start() throws Exception {
    server = NettyServerBuilder.forPort(BackendConstants.PORT).addService(ServerInterceptors
        .intercept(AbelanaGrpc.bindService(new AbelanaGrpcImpl()),
            new AuthHeaderServerInterceptor())).build().start();
    LOGGER.info("Server started, listening on " + BackendConstants.PORT);
    Runtime.getRuntime().addShutdownHook(new Thread() {
      @Override
      public void run() {
        System.err.println("*** shutting down gRPC server"
            + " since JVM is shutting down");
        AbelanaGrpcServer.this.stop();
        System.err.println("*** server shut down");
      }
    });
  }

  /**
   * Stops the Abelana GRPC server.
   */
  private void stop() {
    if (server != null) {
      server.shutdown();
    }
  }


}