[jira] [Created] (LOG4J2-155) Re-add getContentType, add getFormat to Layout

["Scott Deboy (JIRA)" <ji...@apache.org>]

Scott Deboy created LOG4J2-155:
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             Summary: Re-add getContentType, add getFormat to Layout
                 Key: LOG4J2-155
                 URL: https://issues.apache.org/jira/browse/LOG4J2-155
             Project: Log4j 2
          Issue Type: Improvement
            Reporter: Scott Deboy


The different Layout implementations don't expose the contentType previously available in log4j.  HTMLLayout has a 'dead' contentType field, but that's it.

It would be useful to expose the content type (text/plain, text/html, text/xml) along with a information about the format.

If the content type is text/plain, exposing the layout format as a conversion pattern would work fine.

If the content type is text/html or text/xml we could expose something else (or null).

My primary interest is adding the ability to 'discover' the file-based logging configurations in order to support them via Chainsaw and multicast DNS.

If all Layouts supporting text/plain content types exposed their format as a conversion pattern, and the file-based appenders (optionally) provided the ability to advertise their configuration, the files could be remotely tailed without the far endpoint even knowing anything about the file configuration.

For an example, see how multicast appenders are exposed via zeroconf/multicast dns in log4j 1.x in activateOptions - something very similar could be done with contenttype and format properties in a fileappender with a layout.

    if (advertiseViaMulticastDNS) {
        Map properties = new HashMap();
        properties.put("multicastAddress", remoteHost);
        zeroConf = new ZeroConfSupport(ZONE, port, getName(), properties);
        zeroConf.advertise();
    }


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