in src/main/java/org/apache/sling/commons/log/logback/internal/SlingLogPanel.java [567:589]
private void renderAppenderContent(LoggerStateContext ctx, PrintWriter pw, String appenderName, TailerOptions opts)
throws IOException {
FileAppender<ILoggingEvent> fileAppender = (FileAppender<ILoggingEvent>) ctx.appenders.values().stream()
.filter(a -> a instanceof FileAppender && appenderName.equals(a.getName()))
.findFirst()
.orElse(null);
if (fileAppender == null) {
pw.printf("No file appender with name [%s] found", XmlUtil.escapeXml(appenderName));
} else {
final File file = new File(fileAppender.getFile());
if (file.exists()) {
if (opts.tailAll()) {
SlingConfigurationPrinter.includeWholeFile(pw, file);
} else {
int numOfLines = opts.getNumOfLines();
if (numOfLines == 0) {
numOfLines = logConfigManger.getNumOfLines();
}
new Tailer(new FilteringListener(pw, opts.getRegex()), numOfLines).tail(file);
}
}
}
}