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.runners.dataflow.worker.windmill.appliance;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Files;
  import java.nio.file.StandardCopyOption;
  import org.apache.beam.runners.dataflow.worker.windmill.WindmillServerBase;
  
  /**
   * JNI Implementation of a {@link WindmillServerBase}.
   *
   * @implNote This is only for use in Streaming Appliance.
   */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class JniWindmillApplianceServer extends WindmillServerBase {
    private static final String WINDMILL_SERVER_JNI_LIBRARY_PROPERTY = "windmill.jni_library";
    private static final String DEFAULT_SHUFFLE_CLIENT_LIBRARY = "libwindmill_service_jni.so";
  
    static {
      try {
        // TODO: Remove the use of JNI here
        File tempfile = File.createTempFile("libwindmill_service_jni", ".so");
        InputStream input =
            ClassLoader.getSystemResourceAsStream(
                System.getProperty(
                    WINDMILL_SERVER_JNI_LIBRARY_PROPERTY, DEFAULT_SHUFFLE_CLIENT_LIBRARY));
        Files.copy(input, tempfile.toPath(), StandardCopyOption.REPLACE_EXISTING);
        System.load(tempfile.getAbsolutePath());
      } catch (IOException e) {
        throw new RuntimeException("Loading windmill_service failed:", e);
      }
    }
  
    /**
     * The host should be specified as protocol://address:port to connect to a windmill server through
     * rpcz.
     */
    public JniWindmillApplianceServer(String host) {
      super(host);
    }
  }
  