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

                    date = null;
                }
            }
        } catch (ParseException e) {
            // Bad date so return null
            Log log = LogFactory.getLog(GenericTypeValidator.class);
            if (log.isDebugEnabled()) {
                log.debug("Date parse failed value=[" + value       + "], " +
                                          "pattern=[" + datePattern + "], " +
                                           "strict=[" + strict      + "] "  + e);
            }
        }

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            formatter.setLenient(false);


            date = formatter.parse(value);
        } catch (ParseException e) {
            // Bad date so return null
            Log log = LogFactory.getLog(GenericTypeValidator.class);
            if (log.isDebugEnabled()) {
                log.debug("Date parse failed value=[" + value  + "], " +
                                           "locale=[" + locale + "] "  + e);
            }
        }


        return date;

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        try {
            value = PropertyUtils.getProperty(bean, property);


        } catch(IllegalAccessException e) {
            Log log = LogFactory.getLog(ValidatorUtils.class);
            log.error(e.getMessage(), e);
        } catch(InvocationTargetException e) {
            Log log = LogFactory.getLog(ValidatorUtils.class);
            log.error(e.getMessage(), e);
        } catch(NoSuchMethodException e) {
            Log log = LogFactory.getLog(ValidatorUtils.class);
            log.error(e.getMessage(), e);
        }


        if (value == null) {
            return null;
        }

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        }
    }


    private void logEnvInfo() {
       try {
          Log log = LogFactory.getLog(Log4jService.class);
          log.info("----------------------------------------------");
          log.info("Started Logging Service");
          log.debug("Log4jService created with configFileName=" + this.configurationFile +
                    ", refreshPeriodSeconds=" + this.refreshPeriod);
          log.info("Runtime Information:");
          log.info("  Install Directory = " + DirectoryUtils.getGeronimoInstallDirectory().toString());
          log.info("  JVM in use = " + System.getProperty("java.vendor") + " Java " + System.getProperty("java.version"));
          log.info("Java Information:");
          log.info("  System property [java.runtime.name]  = " + System.getProperty("java.runtime.name"));
          log.info("  System property [java.runtime.version]  = " + System.getProperty("java.runtime.version"));
          log.info("  System property [os.name]             = " + System.getProperty("os.name"));
          log.info("  System property [os.version]          = " + System.getProperty("os.version"));
          log.info("  System property [sun.os.patch.level]  = " + System.getProperty("sun.os.patch.level"));
          log.info("  System property [os.arch]             = " + System.getProperty("os.arch"));
          log.info("  System property [java.class.version]  = " + System.getProperty("java.class.version"));
          log.info("  System property [locale]              = " + System.getProperty("user.language") + "_" + System.getProperty("user.country"));
          log.info("  System property [unicode.encoding]    = " + System.getProperty("sun.io.unicode.encoding"));
          log.info("  System property [file.encoding]       = " + System.getProperty("file.encoding"));
          log.info("  System property [java.vm.name]        = " + System.getProperty("java.vm.name"));
          log.info("  System property [java.vm.vendor]      = " + System.getProperty("java.vm.vendor"));
          log.info("  System property [java.vm.version]     = " + System.getProperty("java.vm.version"));
          log.info("  System property [java.vm.info]        = " + System.getProperty("java.vm.info"));
          log.info("  System property [java.home]           = " + System.getProperty("java.home"));
          log.info("  System property [java.classpath]      = " + System.getProperty("java.classpath"));
          log.info("  System property [java.library.path]   = " + System.getProperty("java.library.path"));
          log.info("  System property [java.endorsed.dirs]  = " + System.getProperty("java.endorsed.dirs"));
          log.info("  System property [java.ext.dirs]       = " + System.getProperty("java.ext.dirs"));
          log.info("  System property [sun.boot.class.path] = " + System.getProperty("sun.boot.class.path"));
          log.info("----------------------------------------------");
       } catch (Exception e) {
          System.err.println("Exception caught during logging of Runtime Information.  Exception=" + e.toString());
       }
    }

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    public final static String HEADER_LOG_ID = "org.apache.synapse.transport.nhttp.headers"; 
    public final static String WIRE_LOG_ID = "org.apache.synapse.transport.nhttp.wire"; 


    public static IOSession decorate(IOSession session, final String id) {
        Log log = LogFactory.getLog(session.getClass());
        Log wirelog = LogFactory.getLog(WIRE_LOG_ID);
        if (wirelog.isDebugEnabled() || log.isDebugEnabled()) {
            session = new LoggingIOSession(log, wirelog, session, id);
        }
        return session;
    }

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        }
        return session;
    }
    
    public static NHttpClientHandler decorate(NHttpClientHandler handler) {
        Log log = LogFactory.getLog(handler.getClass());
        if (log.isDebugEnabled()) {
            handler = new LoggingNHttpClientHandler(log, handler);
        }
        return handler;
    }

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        }
        return handler;
    }


    public static NHttpServiceHandler decorate(NHttpServiceHandler handler) {
        Log log = LogFactory.getLog(handler.getClass());
        if (log.isDebugEnabled()) {
            handler = new LoggingNHttpServiceHandler(log, handler);
        }
        return handler;
    }

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    public static NHttpClientIOTarget createClientConnection(
            final IOSession iosession,
            final HttpResponseFactory responseFactory,
            final ByteBufferAllocator allocator,
            final HttpParams params) {
        Log log = LogFactory.getLog(DefaultNHttpClientConnection.class);
        Log headerlog = LogFactory.getLog(HEADER_LOG_ID);        
        if (headerlog.isDebugEnabled() || log.isDebugEnabled()) {
            return new LoggingNHttpClientConnection(
                    log, 
                    headerlog, 
                    iosession, 
                    responseFactory,

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    public static NHttpServerIOTarget createServerConnection(
            final IOSession iosession,
            final HttpRequestFactory requestFactory,
            final ByteBufferAllocator allocator,
            final HttpParams params) {
        Log log = LogFactory.getLog(DefaultNHttpClientConnection.class);
        Log headerlog = LogFactory.getLog(HEADER_LOG_ID);        
        if (headerlog.isDebugEnabled() || log.isDebugEnabled()) {
            return new LoggingNHttpServerConnection(
                    log, 
                    headerlog, 
                    iosession, 
                    requestFactory,

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        StatisticsReporter.reportForComponent(synCtx,
                proxy.getAspectConfiguration(),
                ComponentType.PROXYSERVICE);
        
        // get service log for this message and attach to the message context also set proxy name
        Log serviceLog = LogFactory.getLog(SynapseConstants.SERVICE_LOGGER_PREFIX + name);
        ((Axis2MessageContext) synCtx).setServiceLog(serviceLog);


        synCtx.setProperty(SynapseConstants.PROXY_SERVICE, name);
        synCtx.setTracingState(proxy.getTraceState());

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