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


  int diff = new Random().nextInt();
  
  public RecursiveAppender() {
    System.out.println("in RecursiveAppender constructor");
    Logger logger = LoggerFactory.getLogger("RecursiveAppender"+diff);
    System.out.println("logger class="+logger.getClass().getName());
    logger.info("Calling a logger in the constructor");
  }

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    System.clearProperty(CONFIG_FILE_KEY);
    super.tearDown();
  }


  public void testLog4j() {
    Logger logger = LoggerFactory.getLogger("x"+diff);
    System.out.println("logger class="+logger.getClass().getName());
    logger.info("hello");
  }

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    Log instance = null;
    // protect against concurrent access of loggerMap
    synchronized (loggerMap) {
      instance = (Log) loggerMap.get(name);
      if (instance == null) {
        Logger logger = LoggerFactory.getLogger(name);
        if(logger instanceof LocationAwareLogger) {
          instance = new SLF4JLocationAwareLog((LocationAwareLogger) logger);
        } else {
          instance = new SLF4JLog(logger);
        }

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   * 
   * @return logger with same name as returned by LoggerFactory
   * @throws ObjectStreamException
   */
  protected Object readResolve() throws ObjectStreamException {
    Logger logger = LoggerFactory.getLogger(this.name);
    return new SLF4JLocationAwareLog((LocationAwareLogger) logger);
  }

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   * (non-Javadoc)
   * 
   * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
   */
  public Logger getLogger(String name) {
    Logger logger = null;
    // protect against concurrent access of loggerMap
    synchronized (this) {
      logger = (Logger) loggerMap.get(name);
      if (logger == null) {
        org.apache.commons.logging.Log jclLogger = LogFactory.getLog(name);

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   * 
   * @return logger with same name as returned by LoggerFactory
   * @throws ObjectStreamException
   */
  protected Object readResolve() throws ObjectStreamException {
    Logger logger = LoggerFactory.getLogger(this.name);
    return new SLF4JLog(logger);
  }

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public class Activator implements BundleActivator {


  private BundleContext m_context = null;


  public void start(BundleContext context) {
    Logger logger = LoggerFactory.getLogger(this.getClass());
    logger.info("Activator.start()");
    m_context = context;
  }

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    m_context = context;
  }


  public void stop(BundleContext context) {
    m_context = null;
    Logger logger = LoggerFactory.getLogger(this.getClass());
    logger.info("Activator.stop");
  }

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    // when it is not guarded the figure is 90 milliseconds,
    // i.e a ration of 1 to 5000
  }


  double debugLoop(int len) {
    Logger logger = LoggerFactory.getLogger(PerfTest.class);
    long start = System.currentTimeMillis();
    for (int i = 0; i < len; i++) {
      logger.debug("hello");
    }


    long end = System.currentTimeMillis();


    long duration = end - start;

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@Test
public class PropertyComparatorTest {


  public void testSingleProperty() {
    Logger logger = LoggerFactory.getLogger(PropertyComparatorTest.class);
    logger.info("dd");
  }

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