content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.sdk.expansion.service;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.util.concurrent.TimeUnit;
  import org.apache.beam.runners.fnexecution.artifact.ArtifactRetrievalService;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.Server;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.netty.NettyServerBuilder;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions;
  
  /** A {@link Server gRPC Server} for an ExpansionService. */
  public class ExpansionServer implements AutoCloseable {
    /**
     * Create a {@link ExpansionServer} for the provided ExpansionService running on an arbitrary
     * port.
     *
     * <p>If port is 0, a free port will be assigned.
     */
    public static ExpansionServer create(ExpansionService service, String host, int port)
        throws IOException {
      return new ExpansionServer(service, host, port);
    }
  
    private final String host;
    private final int port;
    private final Server server;
    private final ExpansionService service;
  
    private ExpansionServer(ExpansionService service, String host, int port) throws IOException {
      this.service = Preconditions.checkNotNull(service);
      this.host = Preconditions.checkNotNull(host);
      this.server =
          NettyServerBuilder.forAddress(new InetSocketAddress(host, port))
              .addService(service)
              .addService(new ArtifactRetrievalService())
              .build()
              .start();
      this.port = server.getPort();
    }
  
    /** Get the host that this {@link ExpansionServer} is bound to. */
    public String getHost() {
      return host;
    }
  
    /** Get the port that this {@link ExpansionServer} is bound to. */
    public int getPort() {
      return port;
    }
  
    @Override
    public void close() throws Exception {
      try {
        // The server has been closed, and should not respond to any new incoming calls.
        server.shutdown();
        service.close();
        server.awaitTermination(60, TimeUnit.SECONDS);
      } finally {
        server.shutdownNow();
        server.awaitTermination();
      }
    }
  }
  