Java Code Examples for javax.servlet.http.HttpServletResponse#getBufferSize()

/**
 * Sends content by copying all bytes from the input stream to the response setting the preferred buffer
 * size. At the end, it flushes response buffer. Passed in {@link InputStream} is fully consumed and closed.
 * The passed in {@link HttpServletResponse} after this call returns is committed and flushed.
 */
public static void sendContent(final InputStream input, final HttpServletResponse response) throws IOException {
  int bufferSize = BUFFER_SIZE;
  if (bufferSize < 1) {
    // if no user override, ask container for bufferSize
    bufferSize = response.getBufferSize();
    if (bufferSize < 1) {
      bufferSize = 8192;
      response.setBufferSize(bufferSize);
    }
  }
  else {
    // user override present, tell container what buffer size we'd like
    response.setBufferSize(bufferSize);
  }
  try (final InputStream from = input; final OutputStream to = response.getOutputStream()) {
    final byte[] buf = new byte[bufferSize];
    while (true) {
      int r = from.read(buf);
      if (r == -1) {
        break;
      }
      to.write(buf, 0, r);
    }
    response.flushBuffer();
  }
}
 

/**
 * Adds span label annotations based on the given HTTP servlet response to the given labels
 * builder.
 *
 * @param response      the http servlet response used to generate the span label annotations.
 * @param labelsBuilder the labels builder to add span label annotations to.
 */
public static void addResponseLabels(HttpServletResponse response, Labels.Builder labelsBuilder) {
  // Add "/http/status_code" to Integer.toString(response.getStatus()), if
  // GAE supports 3.0.
  if (response.getBufferSize() > 0) {
    labelsBuilder.add(
        "/http/response/size", Integer.toString(response.getBufferSize()));
  }
}
 

public ETagResponseWrapper(HttpServletResponse response) {
    super(response);
    capture = new ByteArrayOutputStream(response.getBufferSize());
}