org.slf4j.Logger#trace ( )源码实例Demo

/**
 * Override this to easily change the logging level etc.
 */
protected void performLogging(Logger log, Marker marker, String logMessage) {
    if (loggingLevel == Level.INFO) {
        log.info(marker, logMessage);
    } else if (loggingLevel == Level.DEBUG) {
        log.debug(marker, logMessage);
    } else if (loggingLevel == Level.ERROR) {
        log.error(marker, logMessage);
    } else if (loggingLevel == Level.TRACE) {
        log.trace(marker, logMessage);
    } else if (loggingLevel == Level.WARN) {
        log.warn(marker, logMessage);
    } else {
        log.info(marker, logMessage);
    }
}
 

/**
 * Log at the specified level. If the "logger" is null, nothing is logged.
 * If the "level" is null, nothing is logged. If the "format" or the "argArray"
 * are null, behaviour depends on the SLF4J-backing implementation.
 */
public static void log(Logger logger, Level level, String format, Object[] argArray) {
    if (logger != null && level != null) {
        switch (level) {
        case TRACE:
            logger.trace(format, argArray);
            break;
        case DEBUG:
            logger.debug(format, argArray);
            break;
        case INFO:
            logger.info(format, argArray);
            break;
        case WARN:
            logger.warn(format, argArray);
            break;
        case ERROR:
            logger.error(format, argArray);
            break;
        }
    }
}
 

@Test
public void testLoggingLevelDefaultInfo() {
    //
    System.clearProperty(Constants.LOG_LEVEL_PREFIX + "com.alipay.sofa.rpc");

    AbstractLoggerSpaceFactory loggerSpaceFactory = loggerSpaceFactory4LogbackBuilder.build(
        "com.alipay.sofa.rpc", this.getClass().getClassLoader());
    Logger logger = loggerSpaceFactory.getLogger("com.foo.Bar");

    logger.info("info info info info ");
    logger.debug("debug debug debug debug ");
    logger.trace("trace trace trace trace");

    Assert.assertTrue(logger.isInfoEnabled());
    Assert.assertFalse(logger.isDebugEnabled());

    logger.info("info level===");
}
 

public boolean writeObject(Object object, Path path, Logger log) {
  final long start = System.currentTimeMillis();

  try {
    final byte[] bytes = objectMapper.writeValueAsBytes(object);

    log.info("Writing {} bytes of {} to {}", bytes.length, object, path);

    Files.write(
      path,
      bytes,
      StandardOpenOption.WRITE,
      StandardOpenOption.CREATE,
      StandardOpenOption.TRUNCATE_EXISTING
    );

    return true;
  } catch (Throwable t) {
    log.error("Failed writing {}", object, t);
    return false;
  } finally {
    log.trace("Finishing writing {} after {}", object, JavaUtils.duration(start));
  }
}
 

/**
 * Unmarshall a Document from a Reader.
 * 
 * @param parserPool the ParserPool instance to use
 * @param reader the Reader to unmarshall
 * @return the unmarshalled XMLObject
 * @throws XMLParserException if there is a problem parsing the input data
 * @throws UnmarshallingException if there is a problem unmarshalling the parsed DOM
 */
public static XMLObject unmarshallFromReader(ParserPool parserPool, Reader reader)
        throws XMLParserException, UnmarshallingException {
    Logger log = getLogger();
    log.debug("Parsing Reader into DOM document");
    

    Document messageDoc = parserPool.parse(reader);
    Element messageElem = messageDoc.getDocumentElement();

    if (log.isTraceEnabled()) {
        log.trace("Resultant DOM message was:");
        log.trace(XMLHelper.nodeToString(messageElem));
    }

    log.debug("Unmarshalling DOM parsed from Reader");
    Unmarshaller unmarshaller = Configuration.getUnmarshallerFactory().getUnmarshaller(messageElem);
    if (unmarshaller == null) {
        log.error("Unable to unmarshall Reader, no unmarshaller registered for element "
                + XMLHelper.getNodeQName(messageElem));
        throw new UnmarshallingException(
                "Unable to unmarshall Reader, no unmarshaller registered for element "
                        + XMLHelper.getNodeQName(messageElem));
    }

    XMLObject message = unmarshaller.unmarshall(messageElem);

    log.debug("Reader succesfully unmarshalled");
    return message;
}
 

private static <T> void dolog(final LogLevel level, final Logger log, final String format, Object... value) {
   switch (level) {
   case TRACE:
      if (log.isTraceEnabled())
         log.trace(format, value);
      break;

   case DEBUG:
      if (log.isDebugEnabled())
         log.debug(format, value);
      break;

   case INFO:
      if (log.isInfoEnabled())
         log.info(format, value);
      break;

   case WARN:
      if (log.isWarnEnabled())
         log.warn(format, value);
      break;

   case ERROR:
      if (log.isErrorEnabled())
         log.error(format, value);
      break;

   default:
      break;
   }
}
 

@Override
public void debug(Logger logger) {
    logger.debug("=== C_Message === ");
    logger.trace("\tRAW:        {}", this.getPayload());
    logger.debug("DeviceType:   {}", deviceType.toString());
    logger.debug("SerialNumber: {}", serialNumber);
    logger.debug("RFAddress:    {}", rfAddress);
}
 

public static void write(Class clazz, LogLevel logLevel, String message) {
    Logger logger = LoggerFactory.getLogger(clazz);

    switch (logLevel) {
    case TRACE:
        logger.trace(message);
        break;
    case DEBUG:
        logger.debug(message);
        break;
    case INFO:
        logger.info(message);
        break;
    case WARN:
        logger.warn(message);
        break;
    case ERROR:
        logger.error(message);
        break;
    case FATAL:
        Marker marker = MarkerFactory.getMarker("FATAL");
        logger.error(marker, message);
        break;
    default:
        logger.warn("No suitable log level found");
        break;
    }
}
 

@Test
public void testTraceWithException() {
    Logger mock =
        createStrictMock(Logger.class);

    expect(mock.getName()).andReturn("foo");
    mock.trace("a", e);
    replay(mock);

    InternalLogger logger = new Slf4JLogger(mock);
    logger.trace("a", e);
    verify(mock);
}
 

static void trace_lv(byte[] data, Logger logger) {
    for (int i = 0; i < data.length; ) {
        int l= data[i] & 0xFF;
        logger.trace(String.format("[%02X] %s", l, HexUtils.bin2hex(Arrays.copyOfRange(data, i + 1, i + 1 + l))));
        i += 1 + l;
    }
}
 

@Override
public void put(int level, String msg, Throwable exception) {
  Logger log = getLogger();
  MDC.put("tid", Long.toHexString(Thread.currentThread().getId()));
  switch (level) {
    case SEVERE_LEVEL:
    case ERROR_LEVEL:
      log.error(msg, exception);
      break;
    case WARNING_LEVEL:
      log.warn(msg, exception);
      break;
    case INFO_LEVEL:
    case CONFIG_LEVEL:
      log.info(msg, exception);
      break;
    case FINE_LEVEL:
      log.debug(msg, exception);
      break;
    case FINER_LEVEL:
    case FINEST_LEVEL:
      log.trace(msg, exception);
      break;
    default:
      log.debug(msg, exception);
      break;
  }
}
 

private void log(Logger logger, LogLevel level, String msg) {
    switch (level) {
    case TRACE: 
        logger.trace(msg);
        break;
    case DEBUG: 
        logger.debug(msg);
        break;
    case INFO: 
        logger.info(msg);
        break;
    default: throw new IllegalStateException("Unexpected log level: "+level);
    }
}
 

@Override
public void log(SessionLogEntry entry) {
   if (!shouldLog(entry.getLevel(), entry.getNameSpace())) {
      return;
   }
   Logger logger = getLogger(entry.getNameSpace());
   LogLevel logLevel = getLogLevel(entry.getLevel());
   StringBuilder message = new StringBuilder();
   message.append(getSupplementDetailString(entry));
   message.append(formatMessage(entry));
   switch (logLevel) {
   case TRACE:
      logger.trace(message.toString());
      break;
   case DEBUG:
      logger.debug(message.toString());
      break;
   case WARN:
      logger.warn(message.toString());
      break;
   case ERROR:
      logger.error(message.toString());
      break;
   default :
      logger.info(message.toString());
      break;
   }
}
 

public static void devTrace(Logger log, String format, Object arg1) {
   if (isDevMode()) {
      log.trace(format, arg1);
   }
}
 

public static void devTrace(Logger log, String format, Object arg1, Object arg2) {
   if (isDevMode()) {
      log.trace(format, arg1, arg2);
   }
}
 

/**
 * builds a user exception or returns the wrapped one. If the error is a system error, the error message is logged
 * to the given {@link Logger}.
 *
 * @param logger the logger to write to, if null call won't log
 * @return user exception
 * @deprecated we are no longer required to log UserExceptions whenever we build them. The user will see the exception
 * in the query profile, and the caller can always chose to log the exception if really needed.
 */
@Deprecated
public UserException build(final Logger logger) {
  if (uex != null) {
    return uex;
  }

  boolean isSystemError = errorType == DremioPBError.ErrorType.SYSTEM;

  // make sure system errors use the root error message and display the root cause class name
  if (isSystemError) {
    message = ErrorHelper.getRootMessage(cause);
  } else if (message == null || message.length() == 0) {
    // make sure message is not null or empty, otherwise the user will be completely clueless
    // and it may cause NPE when we generate the corresponding DremioPBError object
    if (cause != null) {
      // this case is possible if a user exception wraps a cause with null message (NPE ?)
      // and we don't set a custom error message
      message = cause.getClass().getSimpleName();
    } else {
      // we should never hit this unless we are using user exception in the wrong way
      message = "";
    }
  }

  final UserException newException = new UserException(this);

  if (logger != null) {
    // since we just created a new exception, we should log it for later reference. If this is a
    // system error, this is
    // an issue that the system admin should pay attention to and we should log as ERROR.
    // However, if this is a user
    // mistake or data read issue, the system admin should not be concerned about these and thus
    // we'll log this
    // as an INFO message.
    try {
      switch (errorType) {
        case SYSTEM:
          logger.error(newException.getMessage(), newException);
          break;
        case OUT_OF_MEMORY:
          logger.error(newException.getMessage(), newException);
          break;
        case SCHEMA_CHANGE:
        case IO_EXCEPTION:
          logger.debug(newException.getMessage(), newException);
          break;
        case VALIDATION:
        case PLAN:
          // log SQL validation/plan errors in trace mode since the end user will anyway see
          // them when failure is reported in UI
          logger.trace(newException.getMessage(), newException);
          break;
        default:
          logger.info(
              "User Error Occurred [" + newException.getErrorIdWithIdentity() + "]",
              newException);
      }
    } catch (Throwable ignore) {
      // logback can cause stack overflow exceptions.
      // see https://dremio.atlassian.net/browse/DX-15825
      Exception e = new Exception("Failure while logging", ignore.getCause());
      e.addSuppressed(newException);
      // we can't log the exception so make sure we are printing to std.out otherwise it will be completely hidden
      e.printStackTrace();

      newException.addSuppressed(ignore);
    }
  }

  return newException;
}
 

@Override
public void run(DeviceDriverContext context, Object value) {
   Logger log = context.getLogger();

   switch (lg.getLevel()) {
   case TRACE:
      if (log.isTraceEnabled()) {
         log.trace(message());
      }
      break;

   case DEBUG:
      if (log.isDebugEnabled()) {
         log.debug(message());
      }
      break;

   case INFO:
      if (log.isInfoEnabled()) {
         log.info(message());
      }
      break;

   case WARN:
      if (log.isWarnEnabled()) {
         log.warn(message());
      }
      break;

   case ERROR:
      if (log.isErrorEnabled()) {
         log.error(message());
      }
      break;

   default:
      if (log.isDebugEnabled()) {
         log.debug(message());
      }
      break;
   }
}
 

public void message(Logger log, String format, Object... arguments) {
  log.trace(format, arguments);
}
 

/**
 * Write a class to the log.
 *
 * <p>
 * Writes at level TRACE.
 *
 * @param logger
 *          the logger to write to
 * @param logTag
 *          a tag to print to the log
 * @param classNode
 *          the class
 */
public static void logClass(final Logger logger, final String logTag, final ClassNode classNode) {
  if (logger.isTraceEnabled()) {
    logger.trace(logTag);
    final StringWriter stringWriter = new StringWriter();
    final PrintWriter printWriter = new PrintWriter(stringWriter);
    final TraceClassVisitor traceClassVisitor = new TraceClassVisitor(printWriter);
    classNode.accept(traceClassVisitor);
    logger.trace(stringWriter.toString());
  }
}
 

/**
 * Compare the node identifier of the request with the node identifier within the response
 * with user-oriented logging in two log levels for monitoring KLF behavior.
 *
 * @param logger Instantiated logging class to be used for output.
 * @param reqNodeID Node identifier of the request.
 * @param cfmNodeID Node identifier of the response.
 * @return <b>success</b> of type boolean which signals the success of the communication.
 */
public static boolean check4matchingNodeID(Logger logger, int reqNodeID, int cfmNodeID) {
    logger.trace("check4matchingNodeID() called for requestNodeID {} and responseNodeID {}.", reqNodeID, cfmNodeID);
    return check4matchingAnyID(logger, "NodeID", reqNodeID, cfmNodeID);
}