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

    }


    public void testIncorrectTerminatorType()
    {
        ErrorHandler eh = getErrorHandler();
        Log log = getLog();


        eh.error(
            log,
            "-String- is not an instance of interface "
                + "org.apache.hivemind.lib.pipeline.StandardService suitable for "

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    }


    public void testIncorrectFilterType()
    {
        ErrorHandler eh = getErrorHandler();
        Log log = getLog();


        eh.error(
            log,
            "-String- is not an instance of interface "
                + "org.apache.hivemind.lib.pipeline.StandardFilter suitable for "

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        module.getClassResolver();
        moduleControl.setReturnValue(new DefaultClassResolver());


        ErrorHandler eh = getErrorHandler();
        Log log = getLog();


        replayControls();


        PipelineAssembler pa =
            new PipelineAssembler(

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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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     */
    public void testSetLogger()
    {
        AbstractConfiguration config = getEmptyConfiguration();
        assertNotNull("Default logger is null", config.getLogger());
        Log log = LogFactory.getLog(config.getClass());
        config.setLogger(log);
        assertSame("Logger was not set", log, config.getLogger());
    }

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    {
        ClassFactory cf = new ClassFactoryImpl();


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


        LoggingInterceptorClassFactory f = new LoggingInterceptorClassFactory(cf);


        MockControl spControl = newControl(ServicePoint.class);
        ServicePoint sp = (ServicePoint) spControl.getMock();
        
        // Training


        sp.getServiceInterface();
        spControl.setReturnValue(Runnable.class);
                
        sp.getExtensionPointId();
        spControl.setReturnValue("foo.bar");
        
        replayControls();


        // Create interceptor
        InterceptorStackImpl is = new InterceptorStackImpl(log, sp, r);


        Class interceptorClass = f.constructInterceptorClass(is, Collections.EMPTY_LIST);
        Constructor c = interceptorClass.getConstructors()[0];


        Object interceptor =  c.newInstance(new Object[] { is.getServiceLog(), is.peek() });
        is.push(interceptor);


        Runnable ri = (Runnable) is.peek();


        verifyControls();


        // Training
        
        log.isDebugEnabled();
        logControl.setReturnValue(true);


        log.debug("BEGIN run()");
        log.debug("END run()");
        
        r.run();


        replayControls();

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        factory.setBasePath("conf");
        factory.setAttributeSplittingDisabled(true);
        factory.setDelimiterParsingDisabled(true);
        factory.setListDelimiter('/');
        factory.setThrowExceptionOnMissing(true);
        Log log = LogFactory.getLog(getClass());
        factory.setLogger(log);
        factory.clearErrorListeners();
        factory.clearConfigurationListeners();
        ConfigurationListenerTestImpl l =
                new ConfigurationListenerTestImpl(factory);

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    public void testMultiTenentConfiguration3() throws Exception
    {
        factory.setFile(MULTI_TENENT_FILE);
        StringWriter writer = new StringWriter();
        WriterAppender app = new WriterAppender(new SimpleLayout(), writer);
        Log log = LogFactory.getLog("TestLogger");
        Logger logger = ((Log4JLogger)log).getLogger();
        logger.addAppender(app);
        logger.setLevel(Level.DEBUG);
        logger.setAdditivity(false);

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        factory.setBasePath("conf");
        factory.setAttributeSplittingDisabled(true);
        factory.setDelimiterParsingDisabled(true);
        factory.setListDelimiter('/');
        factory.setThrowExceptionOnMissing(true);
        Log log = LogFactory.getLog(getClass());
        factory.setLogger(log);
        factory.clearErrorListeners();
        factory.clearConfigurationListeners();
        ConfigurationListenerTestImpl l =
                new ConfigurationListenerTestImpl(factory);

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    public void testMultiTenentConfiguration3() throws Exception
    {
        factory.setFile(MULTI_TENENT_FILE);
        StringWriter writer = new StringWriter();
        WriterAppender app = new WriterAppender(new SimpleLayout(), writer);
        Log log = LogFactory.getLog("TestLogger");
        Logger logger = ((Log4JLogger)log).getLogger();
        logger.addAppender(app);
        logger.setLevel(Level.DEBUG);
        logger.setAdditivity(false);

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