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

                                 ? (int)(partLength - totalRead) : MAX_BYTES_TO_READ);
        }
      } catch (IOException ie) {
        TaskTracker tracker = 
          (TaskTracker) context.getAttribute("task.tracker");
        Log log = (Log) context.getAttribute("log");
        String errorMsg = ("getMapOutput(" + mapId + "," + reduceId + 
                           ") failed :\n"+
                           StringUtils.stringifyException(ie));
        log.warn(errorMsg);
        if (isInputException) {
          tracker.mapOutputLost(mapId, errorMsg);
        }
        response.sendError(HttpServletResponse.SC_GONE, errorMsg);
        shuffleMetrics.failedOutput();

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                instances = new HashMap();
                instancesByClassLoader.put(contextClassLoader, instances);
            }


            // get the log
            Log log = (Log) instances.get(name);
            if (log == null) {
                log = new GeronimoLog(name, logFactory.getInstance(name));
                instances.put(name, log);
            }
            return log;

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        conf.setOutputFormat(EsOutputFormat.class);
        // define an output dir to prevent Cascading from setting up a TempHfs and overriding the OutputFormat
        Settings set = loadSettings(conf, false);


        Log log = LogFactory.getLog(EsTap.class);
        InitializationUtils.setValueWriterIfNotSet(set, CascadingValueWriter.class, log);
        InitializationUtils.setValueReaderIfNotSet(set, JdkValueReader.class, log);
        InitializationUtils.setBytesConverterIfNeeded(set, CascadingLocalBytesConverter.class, log);
        InitializationUtils.setFieldExtractorIfNotSet(set, CascadingFieldExtractor.class, log);


        // NB: we need to set this property even though it is not being used - and since and URI causes problem, use only the resource/file
        //conf.set("mapred.output.dir", set.getTargetUri() + "/" + set.getTargetResource());
        HadoopCfgUtils.setFileOutputFormatDir(conf, set.getResourceWrite());
        HadoopCfgUtils.setOutputCommitterClass(conf, EsOutputFormat.EsOldAPIOutputCommitter.class.getName());


        if (log.isTraceEnabled()) {
            log.trace("Initialized (sink) configuration " + HadoopCfgUtils.asProperties(conf));
        }
    }

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                                 ? (int)(partLength - totalRead) : MAX_BYTES_TO_READ);
        }
      } catch (IOException ie) {
        TaskTracker tracker = 
          (TaskTracker) context.getAttribute("task.tracker");
        Log log = (Log) context.getAttribute("log");
        String errorMsg = ("getMapOutput(" + mapId + "," + reduceId + 
                           ") failed :\n"+
                           StringUtils.stringifyException(ie));
        log.warn(errorMsg);
        if (isInputException) {
          tracker.mapOutputLost(mapId, errorMsg);
        }
        response.sendError(HttpServletResponse.SC_GONE, errorMsg);
        shuffleMetrics.failedOutput();

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        Collection recipients = new ArrayList(1);
        recipients.add(new InternetAddress(anAction.getAddress()));
        MailAddress sender = aMail.getSender();
        context.post(sender, recipients, aMail.getMessage());
        aMail.setState(Mail.GHOST);
        Log log = context.getLog();
        if (log.isDebugEnabled()) {
            log.debug("Redirected Message ID: "
                + aMail.getMessage().getMessageID() + " to \""
                + anAction.getAddress() + "\"");
        }
    }

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        }
    }


    public static boolean setFieldExtractorIfNotSet(Settings settings, Class<? extends FieldExtractor> clazz, Log log) {
        if (!StringUtils.hasText(settings.getMappingIdExtractorClassName())) {
            Log logger = (log != null ? log : LogFactory.getLog(clazz));


            String name = clazz.getName();
            settings.setProperty(ConfigurationOptions.ES_MAPPING_DEFAULT_EXTRACTOR_CLASS, name);
            if (logger.isDebugEnabled()) {
                logger.debug(String.format("Using pre-defined field extractor [%s] as default", settings.getMappingIdExtractorClassName()));
            }
            return true;
        }


        return false;

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        }
    }


    public static boolean setValueWriterIfNotSet(Settings settings, Class<? extends ValueWriter<?>> clazz, Log log) {
        if (!StringUtils.hasText(settings.getSerializerValueWriterClassName())) {
            Log logger = (log != null ? log : LogFactory.getLog(clazz));


            String name = clazz.getName();
            if (settings.getInputAsJson()) {
                name = NoOpValueWriter.class.getName();
                if (logger.isDebugEnabled()) {
                    logger.debug(String.format("Elasticsearch input marked as JSON; bypassing serialization through [%s] instead of [%s]", name, clazz));
                }
            }
            settings.setProperty(ConfigurationOptions.ES_SERIALIZATION_WRITER_VALUE_CLASS, name);
            if (logger.isDebugEnabled()) {
                logger.debug(String.format("Using pre-defined writer serializer [%s] as default", settings.getSerializerValueWriterClassName()));
            }
            return true;
        }


        return false;

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    }


    public static boolean setBytesConverterIfNeeded(Settings settings, Class<? extends BytesConverter> clazz, Log log) {
        if (settings.getInputAsJson() && !StringUtils.hasText(settings.getSerializerBytesConverterClassName())) {
            settings.setProperty(ConfigurationOptions.ES_SERIALIZATION_WRITER_BYTES_CLASS, clazz.getName());
            Log logger = (log != null ? log : LogFactory.getLog(clazz));
            if (logger.isDebugEnabled()) {
                logger.debug(String.format("JSON input specified; using pre-defined bytes/json converter [%s] as default", settings.getSerializerBytesConverterClassName()));
            }
            return true;
        }


        return false;

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    public static boolean setValueReaderIfNotSet(Settings settings, Class<? extends ValueReader> clazz, Log log) {


        if (!StringUtils.hasText(settings.getSerializerValueReaderClassName())) {
            settings.setProperty(ConfigurationOptions.ES_SERIALIZATION_READER_VALUE_CLASS, clazz.getName());
            Log logger = (log != null ? log : LogFactory.getLog(clazz));
            if (logger.isDebugEnabled()) {
                logger.debug(String.format("Using pre-defined reader serializer [%s] as default", settings.getSerializerValueReaderClassName()));
            }
            return true;
        }


        return false;

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            String host=ping_dest instanceof IpAddress? ((IpAddress)ping_dest).getIpAddress().getHostAddress() : ping_dest.toString();
            String command=cmd + " " + host;
            if(log.isDebugEnabled())
                log.debug("executing \"" + command + "\" (own address=" + local_addr + ')');
            try {
                Log tmp_log=verbose? log : null;
                int rc=Pinger.execute(command, tmp_log);
                num_heartbeats++;
                if(rc == 0) { // success
                    num_tries=0;
                }

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