jdk_logger_chain_of_responsibility_pattern_example.java

/**
 * Log a LogRecord.
 * <p>
 * All the other logging methods in this class call through
 * this method to actually perform any logging.  Subclasses can
 * override this single method to capture all log activity.
 *
 * @param record the LogRecord to be published
 */
public void log(LogRecord record) {
    if (!isLoggable(record.getLevel())) {
        return;
    }
    Filter theFilter = filter;
    if (theFilter != null && !theFilter.isLoggable(record)) {
        return;
    }

    // Post the LogRecord to all our Handlers, and then to
    // our parents' handlers, all the way up the tree.

    Logger logger = this;
    while (logger != null) {
        final Handler[] loggerHandlers = isSystemLogger
            ? logger.accessCheckedHandlers()
            : logger.getHandlers();

        for (Handler handler : loggerHandlers) {
            handler.publish(record);
        }

        final boolean useParentHdls = isSystemLogger
            ? logger.useParentHandlers
            : logger.getUseParentHandlers();

        if (!useParentHdls) {
            break;
        }

        logger = isSystemLogger ? logger.parent : logger.getParent();
    }
}