Examples of org.apache.commons.logging.Log

org.apache.commons.logging.Log
A simple logging interface abstracting logging APIs. In order to be instantiated successfully by {@link LogFactory}, classes that implement this interface must have a constructor that takes a single String parameter representing the "name" of this Log.

The six logging levels used by Log are (in order):
1. trace (the least serious)
2. debug
3. info
4. warn
5. error
6. fatal (the most serious)
The mapping of these log levels to the concepts used by the underlying logging system is implementation dependent. The implemention should ensure, though, that this ordering behaves as expected.

Performance is often a logging concern. By examining the appropriate property, a component can avoid expensive operations (producing information to be logged).

For example,
```
 if (log.isDebugEnabled()) { ... do something expensive ... log.debug(theResult); } 
```
Configuration of the underlying logging system will generally be done external to the Logging APIs, through whatever mechanism is supported by that system.
@author Scott Sanders @author Rod Waldhoff

        } else if (Double.class.equals(wrapperType)) {
            return double.class;
        } else if (Character.class.equals(wrapperType)) {
            return char.class;
        } else {
            Log log = LogFactory.getLog(MethodUtils.class);
            if (log.isDebugEnabled()) {
                log.debug("Not a known primitive wrapper class: " + wrapperType);
            }
            return null;
        }
    }

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   * 
   * @exception LogConfigurationException
   *              if a suitable <code>Log</code> instance cannot be returned
   */
  public Log getInstance(String name) throws LogConfigurationException {
    Log instance = null;
    // protect against concurrent access of loggerMap
    synchronized (this) {
      instance = (Log) loggerMap.get(name);
      if (instance == null) {
        Logger logger = LoggerFactory.getLogger(name);

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    /**
     * @see org.apache.jsieve.Executable#execute(MailAdapter, SieveContext)
     */
    public Object execute(MailAdapter mail, SieveContext context)
            throws SieveException {
        Log log = context.getLog();
        if (log.isDebugEnabled()) {
            log.debug(toString());
            coordinate.debugDiagnostics(log);
        }
        // commands are executed after the parsing phase
        // recursively from the top level block
        // so need to use the coordinate recorded from the parse

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     * @return true when the test passes, false otherwise
     * @throws LookupException
     * @throws SieveException
     */
    public boolean isTestPassed(MailAdapter mail, SieveContext context) throws LookupException, SieveException {
        Log log = context.getLog();
        if (log.isDebugEnabled()) {
            log.debug(toString());
        }
        final String name = getName();
        final ExecutableTest test = context.getTestManager().getTest(name);
        return test.execute(mail, getArguments(), context);
    }

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   * The main method for the HBase rest server.
   * @param args command-line arguments
   * @throws Exception exception
   */
  public static void main(String[] args) throws Exception {
    Log LOG = LogFactory.getLog("RESTServer");


    VersionInfo.logVersion();
    FilterHolder authFilter = null;
    Configuration conf = HBaseConfiguration.create();
    Class<? extends ServletContainer> containerClass = ServletContainer.class;


    // login the server principal (if using secure Hadoop)
    if (User.isSecurityEnabled() && User.isHBaseSecurityEnabled(conf)) {
      String machineName = Strings.domainNamePointerToHostName(
        DNS.getDefaultHost(conf.get(REST_DNS_INTERFACE, "default"),
          conf.get(REST_DNS_NAMESERVER, "default")));
      String keytabFilename = conf.get(REST_KEYTAB_FILE);
      Preconditions.checkArgument(keytabFilename != null && !keytabFilename.isEmpty(),
        REST_KEYTAB_FILE + " should be set if security is enabled");
      String principalConfig = conf.get(REST_KERBEROS_PRINCIPAL);
      Preconditions.checkArgument(principalConfig != null && !principalConfig.isEmpty(),
        REST_KERBEROS_PRINCIPAL + " should be set if security is enabled");
      User.login(conf, REST_KEYTAB_FILE, REST_KERBEROS_PRINCIPAL, machineName);
      if (conf.get(REST_AUTHENTICATION_TYPE) != null) {
        containerClass = RESTServletContainer.class;
        authFilter = new FilterHolder();
        authFilter.setClassName(AuthFilter.class.getName());
        authFilter.setName("AuthenticationFilter");
      }
    }


    UserGroupInformation realUser = User.getCurrent().getUGI();
    RESTServlet servlet = RESTServlet.getInstance(conf, realUser);


    Options options = new Options();
    options.addOption("p", "port", true, "Port to bind to [default: 8080]");
    options.addOption("ro", "readonly", false, "Respond only to GET HTTP " +
      "method requests [default: false]");
    options.addOption(null, "infoport", true, "Port for web UI");


    CommandLine commandLine = null;
    try {
      commandLine = new PosixParser().parse(options, args);
    } catch (ParseException e) {
      LOG.error("Could not parse: ", e);
      printUsageAndExit(options, -1);
    }


    // check for user-defined port setting, if so override the conf
    if (commandLine != null && commandLine.hasOption("port")) {
      String val = commandLine.getOptionValue("port");
      servlet.getConfiguration()
          .setInt("hbase.rest.port", Integer.valueOf(val));
      LOG.debug("port set to " + val);
    }


    // check if server should only process GET requests, if so override the conf
    if (commandLine != null && commandLine.hasOption("readonly")) {
      servlet.getConfiguration().setBoolean("hbase.rest.readonly", true);
      LOG.debug("readonly set to true");
    }


    // check for user-defined info server port setting, if so override the conf
    if (commandLine != null && commandLine.hasOption("infoport")) {
      String val = commandLine.getOptionValue("infoport");
      servlet.getConfiguration()
          .setInt("hbase.rest.info.port", Integer.valueOf(val));
      LOG.debug("Web UI port set to " + val);
    }


    @SuppressWarnings("unchecked")
    List<String> remainingArgs = commandLine != null ?
        commandLine.getArgList() : new ArrayList<String>();

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   * Switches the logger for the given class to DEBUG level.
   *
   * @param clazz  The class for which to switch to debug logging.
   */
  public void enableDebug(Class<?> clazz) {
    Log l = LogFactory.getLog(clazz);
    if (l instanceof Log4JLogger) {
      ((Log4JLogger) l).getLogger().setLevel(org.apache.log4j.Level.DEBUG);
    } else if (l instanceof Jdk14Logger) {
      ((Jdk14Logger) l).getLogger().setLevel(java.util.logging.Level.ALL);
    }

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public class ProxyLoggingInterceptorFactory implements ServiceInterceptorFactory
{


    public void createInterceptor(InterceptorStack stack, Module invokingModule, Object parameters)
    {
        Log log = stack.getServiceLog();


        InvocationHandler handler = new ProxyLoggingInvocationHandler(log, stack.peek());


        Object interceptor =
            Proxy.newProxyInstance(

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        List tasks = new ArrayList();
        tasks.add(t1);
        tasks.add(t2);


        MockControl logControl = newControl(Log.class);
        Log log = (Log) logControl.getMock();


        TaskExecutor e = new TaskExecutor();


        ErrorLog errorLog = (ErrorLog) newMock(ErrorLog.class);


        e.setErrorLog(errorLog);
        e.setLog(log);
        e.setMessages(getMessages());
        e.setTasks(tasks);


        // Note the ordering; explicitly set, to check that ordering does
        // take place.
        log.info("Executing task Fixture #2.");
        log.info("Executing task Fixture #1.");
        log.info("Executed 2 tasks \\(in \\d+ milliseconds\\)\\.");
        logControl.setMatcher(new RegexpMatcher());


        replayControls();


        e.run();

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        t.setTitle("Failure");


        List tasks = Collections.singletonList(t);


        MockControl logControl = newControl(Log.class);
        Log log = (Log) logControl.getMock();


        MockControl errorLogControl = newControl(ErrorLog.class);
        ErrorLog errorLog = (ErrorLog) errorLogControl.getMock();


        log.info("Executing task Failure.");


        errorLog.error(
                "Exception while executing task Failure: Failure!",
                null,
                new ApplicationRuntimeException(""));
        errorLogControl.setMatcher(new AggregateArgumentsMatcher(new ArgumentMatcher[]
        { null, null, new TypeMatcher() }));


        log.info("Executed one task with one failure \\(in \\d+ milliseconds\\)\\.");
        logControl.setMatcher(new AggregateArgumentsMatcher(new RegexpMatcher()));


        replayControls();


        TaskExecutor e = new TaskExecutor();

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    public void testTerminatorConflict()
    {
        MockControl c = newControl(ErrorHandler.class);
        ErrorHandler eh = (ErrorHandler) c.getMock();


        Log log = getLog();


        eh.error(
            log,
            "Terminator ss2 for pipeline service foo.bar conflicts with "
                + "previous terminator (ss1, at unknown location) and has been ignored.",

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