Examples of org.slf4j.Logger

org.slf4j.Logger

The org.slf4j.Logger interface is the main user entry point of SLF4J API. It is expected that logging takes place through concrete implementations of this interface.

Typical usage pattern:

 import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class Wombat { final static Logger logger = LoggerFactory.getLogger(Wombat.class); Integer t; Integer oldT; public void setTemperature(Integer temperature) { oldT = t;         t = temperature; logger.debug("Temperature set to {}. Old temperature was {}.", t, oldT); if(temperature.intValue() > 50) { logger.info("Temperature has risen above 50 degrees."); } } }

@author Ceki Gülcü

    private static Class getClass(IoSession session) {
        return session.getHandler().getClass();
    }


    public static void debug(IoSession session, String message) {
        Logger log = getLogger(session);
        if (log.isDebugEnabled()) {
            log.debug(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }

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            log.debug(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }


    public static void debug(IoSession session, String message, Throwable cause) {
        Logger log = getLogger(session);
        if (log.isDebugEnabled()) {
            log.debug(String.valueOf(session.getAttribute(PREFIX)) + message,
                    cause);
        }
    }

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                    cause);
        }
    }


    public static void info(IoSession session, String message) {
        Logger log = getLogger(session);
        if (log.isInfoEnabled()) {
            log.info(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }

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            log.info(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }


    public static void info(IoSession session, String message, Throwable cause) {
        Logger log = getLogger(session);
        if (log.isInfoEnabled()) {
            log.info(String.valueOf(session.getAttribute(PREFIX)) + message,
                    cause);
        }
    }

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                    cause);
        }
    }


    public static void warn(IoSession session, String message) {
        Logger log = getLogger(session);
        if (log.isWarnEnabled()) {
            log.warn(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }

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            log.warn(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }


    public static void warn(IoSession session, String message, Throwable cause) {
        Logger log = getLogger(session);
        if (log.isWarnEnabled()) {
            log.warn(String.valueOf(session.getAttribute(PREFIX)) + message,
                    cause);
        }
    }

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                    cause);
        }
    }


    public static void error(IoSession session, String message) {
        Logger log = getLogger(session);
        if (log.isErrorEnabled()) {
            log.error(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }

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            log.error(String.valueOf(session.getAttribute(PREFIX)) + message);
        }
    }


    public static void error(IoSession session, String message, Throwable cause) {
        Logger log = getLogger(session);
        if (log.isErrorEnabled()) {
            log.error(String.valueOf(session.getAttribute(PREFIX)) + message,
                    cause);
        }
    }

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    public static boolean isErrorEnabled(IoSession session) {
        return getLogger(session).isErrorEnabled();
    }


    private static Logger getLogger(IoSession session) {
        Logger log = (Logger) session.getAttribute(LOGGER);
        if (log == null) {
            log = LoggerFactory.getLogger(getClass(session));
            String prefix = (String) session.getAttribute(PREFIX);
            if (prefix == null) {
                prefix = "[" + session.getRemoteAddress() + "] ";

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    {
        String pageClassName = APP_ROOT_PACKAGE + ".pages.SimplePage";


        ComponentInstantiatorSource source = mockComponentInstantiatorSource();
        ClassNameLocator locator = newClassNameLocator();
        Logger logger = compliantLogger();


        train_for_app_packages(source);


        train_locateComponentClassNames(locator, APP_ROOT_PACKAGE + ".pages", pageClassName);

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