How to use

org.atmosphere.util.ByteArrayAsyncWriter

constructor

protected byte[] transform(AtmosphereResponse response, byte[] b, int offset, int length) throws IOException {
  AsyncIOWriter a = response.getAsyncIOWriter();
  // NOTE #1961 for now, create a new buffer par transform call and release it after the transform call.
  //      Alternatively, we may cache the buffer in thread-local and use it while this thread invokes
  //      multiple writes and release it when this thread invokes the close method.
  ByteArrayAsyncWriter buffer = new ByteArrayAsyncWriter();
  try {
    response.asyncIOWriter(buffer);
    invokeInterceptor(response, b, offset, length);
    return buffer.stream().toByteArray();
  } finally {
    buffer.close(null);
    response.asyncIOWriter(a);
  }
}