Java Logger.log方法代码示例

import org.apache.log4j.Logger; //导入方法依赖的package包/类
@Test(expected = EventDeliveryException.class)
public void testSlowness() throws Throwable {
  ch = new SlowMemoryChannel(2000);
  Configurables.configure(ch, new Context());
  configureSource();
  props.put("log4j.appender.out2.Timeout", "1000");
  props.put("log4j.appender.out2.layout", "org.apache.log4j.PatternLayout");
  props.put("log4j.appender.out2.layout.ConversionPattern",
      "%-5p [%t]: %m%n");
  PropertyConfigurator.configure(props);
  Logger logger = LogManager.getLogger(TestLog4jAppender.class);
  Thread.currentThread().setName("Log4jAppenderTest");
  int level = 10000;
  String msg = "This is log message number" + String.valueOf(1);
  try {
    logger.log(Level.toLevel(level), msg);
  } catch (FlumeException ex) {
    throw ex.getCause();
  }
}
 

import org.apache.log4j.Logger; //导入方法依赖的package包/类
@Test
public void testLog4jAppender() throws IOException {
  configureSource();
  PropertyConfigurator.configure(props);
  Logger logger = LogManager.getLogger(TestLog4jAppender.class);
  for (int count = 0; count <= 1000; count++) {
    /*
     * Log4j internally defines levels as multiples of 10000. So if we
     * create levels directly using count, the level will be set as the
     * default.
     */
    int level = ((count % 5) + 1) * 10000;
    String msg = "This is log message number" + String.valueOf(count);

    logger.log(Level.toLevel(level), msg);
    Transaction transaction = ch.getTransaction();
    transaction.begin();
    Event event = ch.take();
    Assert.assertNotNull(event);
    Assert.assertEquals(new String(event.getBody(), "UTF8"), msg);

    Map<String, String> hdrs = event.getHeaders();

    Assert.assertNotNull(hdrs.get(Log4jAvroHeaders.TIMESTAMP.toString()));

    Assert.assertEquals(Level.toLevel(level),
        Level.toLevel(Integer.valueOf(hdrs.get(Log4jAvroHeaders.LOG_LEVEL
            .toString()))
        ));

    Assert.assertEquals(logger.getName(),
        hdrs.get(Log4jAvroHeaders.LOGGER_NAME.toString()));

    Assert.assertEquals("UTF8",
        hdrs.get(Log4jAvroHeaders.MESSAGE_ENCODING.toString()));
    transaction.commit();
    transaction.close();
  }

}
 

import org.apache.log4j.Logger; //导入方法依赖的package包/类
private void sendAndAssertFail(Logger logger) throws Throwable {
  /*
   * Log4j internally defines levels as multiples of 10000. So if we
   * create levels directly using count, the level will be set as the
   * default.
   */
  int level = 20000;
  try {
    logger.log(Level.toLevel(level), "Test Msg");
  } catch (FlumeException ex) {
    ex.printStackTrace();
    throw ex.getCause();
  }
  Transaction transaction = ch.getTransaction();
  transaction.begin();
  Event event = ch.take();
  Assert.assertNull(event);
  transaction.commit();
  transaction.close();

}
 

import org.apache.log4j.Logger; //导入方法依赖的package包/类
@Test
public void testLayout() throws IOException {
  configureSource();
  props.put("log4j.appender.out2.layout", "org.apache.log4j.PatternLayout");
  props.put("log4j.appender.out2.layout.ConversionPattern",
      "%-5p [%t]: %m%n");
  PropertyConfigurator.configure(props);
  Logger logger = LogManager.getLogger(TestLog4jAppender.class);
  Thread.currentThread().setName("Log4jAppenderTest");
  for (int count = 0; count <= 100; count++) {
    /*
     * Log4j internally defines levels as multiples of 10000. So if we
     * create levels directly using count, the level will be set as the
     * default.
     */
    int level = ((count % 5) + 1) * 10000;
    String msg = "This is log message number" + String.valueOf(count);

    logger.log(Level.toLevel(level), msg);
    Transaction transaction = ch.getTransaction();
    transaction.begin();
    Event event = ch.take();
    Assert.assertNotNull(event);
    StringBuilder builder = new StringBuilder();
    builder.append("[").append("Log4jAppenderTest").append("]: ")
        .append(msg);
    //INFO seems to insert an extra space, so lets split the string.
    String eventBody = new String(event.getBody(), "UTF-8");
    String eventLevel = eventBody.split("\\s+")[0];
    Assert.assertEquals(Level.toLevel(level).toString(), eventLevel);
    Assert.assertEquals(
        new String(event.getBody(), "UTF8").trim()
            .substring(eventLevel.length()).trim(), builder.toString());

    Map<String, String> hdrs = event.getHeaders();

    Assert.assertNotNull(hdrs.get(Log4jAvroHeaders.TIMESTAMP.toString()));

    Assert.assertEquals(Level.toLevel(level),
        Level.toLevel(Integer.parseInt(hdrs.get(Log4jAvroHeaders.LOG_LEVEL
            .toString()))));

    Assert.assertEquals(logger.getName(),
        hdrs.get(Log4jAvroHeaders.LOGGER_NAME.toString()));

    Assert.assertEquals("UTF8",
        hdrs.get(Log4jAvroHeaders.MESSAGE_ENCODING.toString()));
    transaction.commit();
    transaction.close();
  }


}
 

import org.apache.log4j.Logger; //导入方法依赖的package包/类
private void writeMessage(Logger logger, String message, Level level) {
    Exception loggingException = null;
    synchronized (auditLogManager) {
        logger.log(level, message);
        loggingException = auditLogManager.getException();
    }
    if (loggingException != null) {
        LOGGER.error(Messages.AUDIT_LOGGING_FAILED, loggingException);
    }
}
 

import org.apache.log4j.Logger; //导入方法依赖的package包/类
/**
 * Issue a message to the log but only if the same message has not
 * been logged already in the same GATE session.
 * This is intended for explanations or warnings that should not be 
 * repeated every time the same situation occurs.
 * 
 * @param logger - the logger instance to use
 * @param level  - the severity level for the message
 * @param message - the message itself
 */
public static void logOnce (Logger logger, Level level, String message) {
  if(!alreadyLoggedMessages.contains(message)) { 
    logger.log(level, message);
    alreadyLoggedMessages.add(message);
  }
}