[logback-dev] [JIRA] Created: (LBCLASSIC-291) performance issue

Roman Kosenko (JIRA) noreply-jira at qos.ch
Sun Sep 4 19:43:16 CEST 2011

performance issue

                 Key: LBCLASSIC-291
                 URL: http://jira.qos.ch/browse/LBCLASSIC-291
             Project: logback-classic
          Issue Type: Improvement
          Components: Other
    Affects Versions: 0.9.29
            Reporter: Roman Kosenko
            Assignee: Logback dev list

http://logback.qos.ch/manual/encoders.html says:
Below is an excerpt from the LayoutWrappingEncoder class illustrating how delegation to the wrapped layout instance is done.
package ch.qos.logback.core.encoder;

public class LayoutWrappingEncoder<E> extends EncoderBase<E> {

  protected Layout<E> layout;
  private Charset charset;

  public void doEncode(E event) throws IOException {
    String txt = layout.doLayout(event);

  private byte[] convertToBytes(String s) {
    if (charset == null) {
      return s.getBytes();
    } else {
      return s.getBytes(charset);

Let's leave fact that this source is uncompilable...
But in real source of ch.qos.logback.core.encoder.LayoutWrappingEncoder  we can see another code. Method convertToBytes contains line: "return s.getBytes(charset.name());".
So real variant isn't so fast as one in example - you get the name of your java.nio.charset.Charset and then String.getBytes make lookup by this name to get Charset instance again. And this is doing for every log message.

P.S. I know, that String.getBytes(Charset) is available from Java 6 only. But it released in 2006 and current version is 7. If you want to support very old version of jre maybe is it better to separate versions like this is doing in other libraries? Another variant is direct using of CharsetEncoder.

This message is automatically generated by JIRA.
If you think it was sent incorrectly contact one of the administrators: http://jira.qos.ch/secure/Administrators.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira


More information about the logback-dev mailing list