Java Logger.warn方法代碼示例

import org.slf4j.Logger; //導入方法依賴的package包/類
public static void warn(Logger log, Throwable th, String msg) {
    if (!log.isWarnEnabled()) {
        return;
    }

    // this operation is expensive, hence don't abuse it.
    StackTraceElement[] traces = Thread.currentThread().getStackTrace();
    if (traces.length > 2) {
        StackTraceElement trace = traces[2];
        log.warn("({} {}) {}, {}: {}", trace.getMethodName(), trace.getLineNumber(), msg,
                th.getClass().getName(), getMessage(th));
    } else {
        log.warn("{}, {}: {}", msg, th.getClass().getName(), getMessage(th));
    }
    log.debug(msg, th);
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
static <OUTPUT, THROWABLE extends Throwable> OUTPUT supplyAndLog(
    Logger log, CheckedSupplier<OUTPUT, THROWABLE> supplier, Supplier<String> name)
    throws THROWABLE {
  final OUTPUT output;
  try {
    output = supplier.get();
  } catch (Throwable t) {
    if (log.isTraceEnabled()) {
      log.trace("Failed to " + name.get(), t);
    } else if (log.isWarnEnabled()){
      log.warn("Failed to " + name.get() + ": " + t);
    }
    throw (THROWABLE)t;
  }

  if (log.isTraceEnabled()) {
    log.trace("Successfully supplied " + name.get());
  }
  return output;
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
/** Attempt to wait the given condition to return true multiple times. */
static void attempt(
    BooleanSupplier condition, int numAttempts, long sleepMs, String name, Logger log)
    throws InterruptedException {
  Objects.requireNonNull(condition, "condition == null");
  Preconditions.assertTrue(numAttempts > 0, () -> "numAttempts = " + numAttempts + " <= 0");
  Preconditions.assertTrue(sleepMs >= 0L, () -> "sleepMs = " + sleepMs + " < 0");

  for(int i = 1; i <= numAttempts; i++) {
    if (condition.getAsBoolean()) {
      return;
    }
    if (log != null && log.isWarnEnabled()) {
      log.warn("FAILED " + name + " attempt #" + i + "/" + numAttempts
          + ": sleep " + sleepMs + "ms and then retry.");
    }
    if (sleepMs > 0) {
      Thread.sleep(sleepMs);
    }
  }

  if (!condition.getAsBoolean()) {
    throw new IllegalStateException("Failed " + name + " for " + numAttempts + " attempts.");
  }
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
protected JsonObject getRequestJsonObject(Logger logger, boolean logFailedRequests) {
    JsonObject chart = new JsonObject();
    chart.addProperty("chartId", chartId);
    try {
        JsonObject data = getChartData();
        if (data == null) {
            // If the data is null we don't send the chart.
            return null;
        }
        chart.add("data", data);
    } catch (Throwable t) {
        if (logFailedRequests) {
            logger.warn("Failed to get data for custom chart with id {}", chartId, t);
        }
        return null;
    }
    return chart;
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
protected static final void regiesterVIServlet(ServletContext context,Logger logger){

        try {
            ServletRegistration.Dynamic asr = context.addServlet("VIApiServlet", VIApiServlet.class);

            if (asr != null) {
                asr.setLoadOnStartup(Integer.MAX_VALUE);
                asr.addMapping("/@in/api/*");
            } else {
                logger.warn("Servlet VIApiServlet already exists");
            }

            ServletRegistration ssr = context.addServlet("VIHttpServlet", StaticContentServlet.class);
            if (ssr != null) {
                ssr.addMapping("/@in/*");
            } else {
                logger.warn("Servlet VIHttpServlet already exists");
            }

        }catch (Throwable e){
            logger.error("VI register servlet failed",e);
        }
    }
 

import org.slf4j.Logger; //導入方法依賴的package包/類
/**
 * 最後成功或異常的輸出都調用這裏。
 *
 * @param response
 * @param jResponse
 */
private final void doFinalWriteOf404(WRequest request, WResponse response, JResponse jResponse)
{
    try
    {
        Object rs = jResponse;
        if (responseHandle != null)
        {
            rs = responseHandle.toResponseOf404(request, response, jResponse);
        }
        response.write(rs);
    } catch (IOException e)
    {
        Throwable ex = getCause(e);
        Logger LOGGER = logger(null);
        LOGGER.warn(ex.getMessage(), ex);
    }
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
@Override
public Object execute(String path, String user, int permission, Logger logger, Map<String, Object> params) throws Exception {
    Object rtn = "";
    AppInfo appInfo = ComponentManager.getStatus(AppInfo.class);

    String opPath = path.substring(startPath.length()).toLowerCase();
    if(!(user!=null && user.length()>2 && user.equals(appInfo.getAppOwner())) && !"uvtrace".equals(opPath)) {
        throw new NoPermissionException();
    }
    switch (opPath){
        case "markdown":
            if(!appInfo.isStatusSourceEnabled()){
                throw new Exception("can't markdwon. because statusSources be disabled!");
            }
            OwnerJudge.getInstance().toAbnormal();
            logger.warn(user + " markdown the app.");
            break;
        case "markup":
            if(!appInfo.isStatusSourceEnabled()){
                throw new Exception("can't markup. because statusSources be disabled!");
            }
            OwnerJudge.getInstance().toNormal();
            logger.warn(user + " markup the app.");
            break;
        case "enablestatussource":
            appInfo.enableStatusSource();
            logger.warn(user + " enable statusSources.");
            break;
        case "disablestatussource":
            appInfo.disableStatusSource();
            logger.warn(user + " disable statusSources.");
            break;
        case "uvtrace":
            eventLogger.fireEvent(HttpUtil.getJsonParamVal(params.get("name")));
            break;
    }
    return rtn;
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
/**
 * Print logs of http request.
 */
public static void logReq(Logger logger, HttpServletRequest req) {
    String queryStr = req.getQueryString();
    if (queryStr == null || queryStr.length() == 0) {
        logger.info(req.getMethod() + " " + req.getRequestURI());
    } else {
        try {
            queryStr = URLDecoder.decode(queryStr, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            logger.warn(e.getMessage());
        }
        logger.info(req.getMethod() + " " + req.getRequestURI() + "?" + queryStr);
    }
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
@Override
public NodeInfo createNodeInfo(NodeDto node) throws IOException {
    if (node == null) {
        throw new IllegalArgumentException();
    }
    Logger log = LoggerFactory.getLogger(getClass());
    try {
        String ipAddress = DtoUtil.getStringOrNull(node, MPLSNMS_ATTR.MANAGEMENT_IP);
        String snmpRO = DtoUtil.getStringOrNull(node, MPLSNMS_ATTR.SNMP_COMMUNITY);
        String userName = DtoUtil.getStringOrNull(node, MPLSNMS_ATTR.TELNET_ACCOUNT);
        String userPass = DtoUtil.getStringOrNull(node, MPLSNMS_ATTR.TELNET_PASSWORD);
        String adminName = DtoUtil.getStringOrNull(node, MPLSNMS_ATTR.ADMIN_ACCOUNT);
        String adminPass = DtoUtil.getStringOrNull(node, MPLSNMS_ATTR.ADMIN_PASSWORD);

        if (ipAddress == null) {
            throw new IllegalStateException("magament ip address is mandatory.");
        }
        if (snmpRO == null) {
            throw new IllegalStateException("SNMP community string (RO) is mandatory.");
        }

        NodeInfo nodeinfo = new NodeInfo(node.getName());
        InetAddress inetAddress = InetAddress.getByAddress(
                VossMiscUtility.getByteFormIpAddress(ipAddress));
        nodeinfo.addIpAddress(inetAddress);
        nodeinfo.setCommunityStringRO(snmpRO);
        nodeinfo.setUserAccount(userName);
        nodeinfo.setUserPassword(userPass);
        nodeinfo.setAdminAccount(adminName);
        nodeinfo.setAdminPassword(adminPass);
        nodeinfo.addSupportedProtocol(ProtocolPort.SNMP_V2C_GETBULK);
        nodeinfo.addSupportedProtocol(ProtocolPort.TELNET);
        return nodeinfo;
    } catch (UnknownHostException e) {
        log.warn("failed to create node-info: " + node.getName(), e);
        return null;
    }
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
/**
 * Reset consumer topic offset according to time
 *
 * @param messageModel which model
 * @param instanceName which instance
 * @param consumerGroup consumer group
 * @param topic topic
 * @param timestamp time
 * @throws Exception
 */
public static void resetOffsetByTimestamp(
    final MessageModel messageModel,
    final String instanceName,
    final String consumerGroup,
    final String topic,
    final long timestamp) throws Exception {
    final Logger log = ClientLogger.getLog();

    DefaultMQPullConsumer consumer = new DefaultMQPullConsumer(consumerGroup);
    consumer.setInstanceName(instanceName);
    consumer.setMessageModel(messageModel);
    consumer.start();

    Set<MessageQueue> mqs = null;
    try {
        mqs = consumer.fetchSubscribeMessageQueues(topic);
        if (mqs != null && !mqs.isEmpty()) {
            TreeSet<MessageQueue> mqsNew = new TreeSet<MessageQueue>(mqs);
            for (MessageQueue mq : mqsNew) {
                long offset = consumer.searchOffset(mq, timestamp);
                if (offset >= 0) {
                    consumer.updateConsumeOffset(mq, offset);
                    log.info("resetOffsetByTimestamp updateConsumeOffset success, {} {} {}",
                        consumerGroup, offset, mq);
                }
            }
        }
    } catch (Exception e) {
        log.warn("resetOffsetByTimestamp Exception", e);
        throw e;
    } finally {
        if (mqs != null) {
            consumer.getDefaultMQPullConsumerImpl().getOffsetStore().persistAll(mqs);
        }
        consumer.shutdown();
    }
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
/**
 * Determine if the specified driver is capable of taking screenshots.
 * 
 * @param optDriver optional web driver object
 * @param logger SLF4J logger object
 * @return 'true' if driver can take screenshots; otherwise 'false
 */
public static boolean canGetArtifact(Optional<WebDriver> optDriver, Logger logger) {
    if (optDriver.isPresent()) {
        WebDriver driver = optDriver.get();
        if (driver instanceof TakesScreenshot) {
            return true;
        } else {
            String message = "This driver is not capable of taking a screenshot.  If a screenshot is desired, use"
                    + " a WebDriver implementation that supports screenshots. For more information, see https://"
                    + "seleniumhq.github.io/selenium/docs/api/java/org/openqa/selenium/TakesScreenshot.html";
            logger.warn(message);
        }
    }
    return false;
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
public void logErrors(Logger logger) {
    if (logger.isErrorEnabled()) {
        for (String msg : errors) {
            logger.warn("{} invalid: {}", getEntityClass().getSimpleName(), msg);
        }
    }
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
public boolean validateAndLog(BlockHeader header, Logger logger) {
    ValidationResult result = validate(header);
    if (!result.success && logger.isErrorEnabled()) {
        logger.warn("{} invalid {}", getEntityClass(), result.error);
    }
    return result.success;
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
public void warn(Logger log, String message, Throwable e) {
    if (printStream != null) {
        printStream.println(colored(COLOR_WARNING, "WARNING: " + message + " " + e));
        e.printStackTrace(printStream);
    } else {
        log.warn(message, e);
    }
}
 

import org.slf4j.Logger; //導入方法依賴的package包/類
public static void doLog(String s, LogLevel logLevel, Logger logger) {
    switch (logLevel) {
        case ERROR: {
            logger.error(s);
            break;
        }

        case WARN: {
            logger.warn(s);
            break;
        }

        case INFO: {
            logger.info(s);
            break;
        }

        case DEBUG: {
            logger.debug(s);
            break;
        }

        case TRACE: {
            logger.trace(s);
            break;
        }

        default: {
            logger.error(s);
            break;
        }
    }
}