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;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Files;
  import java.nio.file.StandardCopyOption;
  
  /** Native library used to read from and write to a shuffle dataset. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  class ShuffleLibrary {
    /** Loads the native shuffle library. */
    static void load() {
      ShuffleLibraryLoader.load();
    }
  
    private static class ShuffleLibraryLoader {
      private static void load() {}
  
      static {
        try {
          final String shuffleClientLibraryPropertyKey = "batch.shuffle_client_library";
          String shuffleClientLibrary = "libshuffle_client_jni.so.stripped";
          if (System.getProperties().containsKey(shuffleClientLibraryPropertyKey)) {
            shuffleClientLibrary = System.getProperty(shuffleClientLibraryPropertyKey);
          }
          File tempfile = File.createTempFile("libshuffle_client_jni", ".so");
          InputStream input = ClassLoader.getSystemResourceAsStream(shuffleClientLibrary);
          Files.copy(input, tempfile.toPath(), StandardCopyOption.REPLACE_EXISTING);
          System.load(tempfile.getAbsolutePath());
        } catch (IOException e) {
          throw new RuntimeException("Loading shuffle_client failed:", e);
        }
      }
    }
  }
  