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.celeborn.common.network;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.file.Files;
  import java.util.Random;
  
  import org.apache.celeborn.common.network.buffer.FileSegmentManagedBuffer;
  import org.apache.celeborn.common.network.buffer.ManagedBuffer;
  import org.apache.celeborn.common.network.buffer.NioManagedBuffer;
  import org.apache.celeborn.common.network.util.TransportConf;
  import org.apache.celeborn.common.util.JavaUtils;
  
  class StreamTestHelper {
    static final String[] STREAMS = {"largeBuffer", "smallBuffer", "emptyBuffer", "file"};
  
    final File testFile;
    final File tempDir;
  
    final ByteBuffer emptyBuffer;
    final ByteBuffer smallBuffer;
    final ByteBuffer largeBuffer;
  
    private static ByteBuffer createBuffer(int bufSize) {
      ByteBuffer buf = ByteBuffer.allocate(bufSize);
      for (int i = 0; i < bufSize; i++) {
        buf.put((byte) i);
      }
      buf.flip();
      return buf;
    }
  
    StreamTestHelper() throws Exception {
      tempDir = Files.createTempDirectory(null).toFile();
      emptyBuffer = createBuffer(0);
      smallBuffer = createBuffer(100);
      largeBuffer = createBuffer(100000);
  
      testFile = File.createTempFile("stream-test-file", "txt", tempDir);
      FileOutputStream fp = new FileOutputStream(testFile);
      try {
        Random rnd = new Random();
        for (int i = 0; i < 512; i++) {
          byte[] fileContent = new byte[1024];
          rnd.nextBytes(fileContent);
          fp.write(fileContent);
        }
      } finally {
        fp.close();
      }
    }
  
    public ByteBuffer srcBuffer(String name) {
      switch (name) {
        case "largeBuffer":
          return largeBuffer;
        case "smallBuffer":
          return smallBuffer;
        case "emptyBuffer":
          return emptyBuffer;
        default:
          throw new IllegalArgumentException("Invalid stream: " + name);
      }
    }
  
    public ManagedBuffer openStream(TransportConf conf, String streamId) {
      switch (streamId) {
        case "file":
          return new FileSegmentManagedBuffer(conf, testFile, 0, testFile.length());
        default:
          return new NioManagedBuffer(srcBuffer(streamId));
      }
    }
  
    void cleanup() {
      if (tempDir != null) {
        try {
          JavaUtils.deleteRecursively(tempDir);
        } catch (IOException io) {
          throw new RuntimeException(io);
        }
      }
    }
  }
  