提交gRPC-spring-boot-starter项目bug修复的pr说明

@Slf4j
public class GrpcServerLifecycle implements SmartLifecycle {
    private static AtomicInteger serverCounter = new AtomicInteger(-1);
    private volatile Server server;
    private volatile int phase = Integer.MAX_VALUE;
    private final GrpcServerFactory factory;
    public GrpcServerLifecycle(final GrpcServerFactory factory) {
        this.factory = factory;
    }
    @Override
    public void start() {
        try {
            createAndStartGrpcServer();
        } catch (final IOException e) {
            throw new IllegalStateException("Failed to start the grpc server", e);
        }
    }
    @Override
    public void stop() {
        stopAndReleaseGrpcServer();
    }
    @Override
    public void stop(final Runnable callback) {
        stop();
        callback.run();
    }
    @Override
    public boolean isRunning() {
        return this.server != null && !this.server.isShutdown();
    }
    @Override
    public int getPhase() {
        return this.phase;
    }
    @Override
    public boolean isAutoStartup() {
        return true;
    }
    /**
     * Creates and starts the grpc server.
     *
     * @throws IOException If the server is unable to bind the port.
     */
    protected void createAndStartGrpcServer() throws IOException {
        final Server localServer = this.server;
        if (localServer == null) {
            this.server = this.factory.createServer();
            this.server.start();
            log.info("gRPC Server started, listening on address: " + this.factory.getAddress() + ", port: "
                    + this.factory.getPort());
            // Prevent the JVM from shutting down while the server is running
            final Thread awaitThread = new Thread(() -> {
                try {
                    this.server.awaitTermination();
                } catch (final InterruptedException e) {
                    Thread.currentThread().interrupt();
                }
            }, "grpc-server-container-" + (serverCounter.incrementAndGet()));
            awaitThread.setDaemon(false);
            awaitThread.start();
        }
    }
    /**
     * Initiates an orderly shutdown of the grpc server and releases the references to the server. This call does not
     * wait for the server to be completely shut down.
     */
    protected void stopAndReleaseGrpcServer() {
        final Server localServer = this.server;
        if (localServer != null) {
            localServer.shutdown();
            this.server = null;
            log.info("gRPC server shutdown.");
        }
    }
}

/**
   * Initiates an orderly shutdown in which preexisting calls continue but new calls are rejected.
   * After this call returns, this server has released the listening socket(s) and may be reused by
   * another server.
   *
   * <p>Note that this method will not wait for preexisting calls to finish before returning.
   * {@link #awaitTermination()} or {@link #awaitTermination(long, TimeUnit)} needs to be called to
   * wait for existing calls to finish.
   *
   * @return {@code this} object
   * @since 1.0.0
   */
  public abstract Server shutdown();

@GrpcService public class GrpcServerService extends SimpleGrpc.SimpleImplBase {
    @Override
  public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) {
        HelloReply reply = HelloReply._newBuilder_().setMessage("Hello ==> " \+ req.getName()).build();
 try {
            System._err_.println("收到请求，阻塞等待");
  TimeUnit._MINUTES_.sleep(1);
  System._err_.println("阻塞完成，请求结束");
  } catch (InterruptedException e) {
            e.printStackTrace();
  }
        responseObserver.onNext(reply);
  responseObserver.onCompleted();
  }
}

protected void stopAndReleaseGrpcServer() {
        final Server localServer = this.server;
        if (localServer != null) {
            localServer.shutdown();
            try {
                this.server.awaitTermination();
            } catch (final InterruptedException e) {
                Thread.currentThread().interrupt();
            }
            this.server = null;
            log.info("gRPC server shutdown.");
        }
    }