Class MeteredBody

micrometer/src/main/java/feign/micrometer/MeteredBody.java:26–72

Body implementation that keeps track of how many bytes are read.

/** {@link Body} implementation that keeps track of how many bytes are read. */
public final class MeteredBody implements Body {

  private final Body delegate;
  private Supplier<Long> count;

  public MeteredBody(Body body) {
    this.delegate = body;
    count = () -> 0L;
  }

  @Override
  public void close() throws IOException {
    delegate.close();
  }

  @Override
  public Integer length() {
    return delegate.length();
  }

  @Override
  public boolean isRepeatable() {
    return delegate.isRepeatable();
  }

  @Override
  public InputStream asInputStream() throws IOException {
    // TODO, ideally, would like not to bring guava just for this
    final CountingInputStream input = new CountingInputStream(delegate.asInputStream());
    count = input::getCount;
    return input;
  }

  @Override
  public Reader asReader() throws IOException {
    return new InputStreamReader(asInputStream(), UTF_8);
  }

  public long count() {
    return count.get();
  }

  @Override
  public Reader asReader(Charset charset) throws IOException {
    return new InputStreamReader(asInputStream(), charset);
  }
}