SyslogAuditLogHandler.java 文件源码

void throwAsIoOrRuntimeException(Throwable t) throws IOException {
    if (t instanceof PortUnreachableException && transport == Transport.UDP) {
        //This is an exception that may or may not happen, see the javadoc for DatagramSocket.send().
        //We don't want something this unreliable polluting the failure count.
        //With UDP syslogging set up against a non-existent syslog server:
        //On OS X this exception never happens.
        //On Linux this seems to happens every other send, so we end up with a loop
        //    odd send works; failure count = 0
        //    even send fails; failure count = 1
        //    odd send works; failure count reset to 0
        //
        //Also, we don't want the full stack trace for this which would get printed by StandardFailureCountHandler.StandardFailureCountHandler.failure(),
        //which also handles the failure count, so we swallow the exception and print a warning.

        ControllerLogger.MGMT_OP_LOGGER.udpSyslogServerUnavailable(getName(), t.getLocalizedMessage());
        return;
    }
    if (t instanceof IOException) {
        throw (IOException)t;
    }
    if (t instanceof RuntimeException) {
        throw (RuntimeException)t;
    }
    throw new RuntimeException(t);
}