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 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 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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                // request path object
                RequestPath requestPath = new RequestPath(app);


                String txname = req.getMethod() + ":" + req.getPath();
                Log eventLog = app.getEventLog();
                if (eventLog.isDebugEnabled()) {
                    eventLog.debug(txname + " starting");
                }


                int tries = 0;
                boolean done = false;
                Throwable error = null;

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        if (!dirtyNodes.isEmpty()) {
            Object[] dirty = dirtyNodes.values().toArray();


            // the set to collect DbMappings to be marked as changed
            HashSet dirtyDbMappings = new HashSet();
            Log eventLog = nmgr.app.getEventLog();


            for (int i = 0; i < dirty.length; i++) {
                Node node = (Node) dirty[i];


                // update nodes in db
                int nstate = node.getState();


                if (nstate == Node.NEW) {
                    nmgr.insertNode(nmgr.db, txn, node);
                    dirtyDbMappings.add(node.getDbMapping());
                    node.setState(Node.CLEAN);


                    // register node with nodemanager cache
                    nmgr.registerNode(node);


                    if (hasListeners) {
                        insertedNodes.add(node);
                    }


                    inserted++;
                    if (eventLog.isDebugEnabled()) {
                        eventLog.debug("inserted node: " + node.getPrototype() + "/" +
                                node.getID());
                    }
                } else if (nstate == Node.MODIFIED) {
                    // only mark DbMapping as dirty if updateNode returns true
                    if (nmgr.updateNode(nmgr.db, txn, node)) {
                        dirtyDbMappings.add(node.getDbMapping());
                    }
                    node.setState(Node.CLEAN);


                    // update node with nodemanager cache
                    nmgr.registerNode(node);


                    if (hasListeners) {
                        updatedNodes.add(node);
                    }


                    updated++;
                    if (eventLog.isDebugEnabled()) {
                        eventLog.debug("updated node: " + node.getPrototype() + "/" +
                                node.getID());
                    }
                } else if (nstate == Node.DELETED) {
                    nmgr.deleteNode(nmgr.db, txn, node);
                    dirtyDbMappings.add(node.getDbMapping());


                    // remove node from nodemanager cache
                    nmgr.evictNode(node);


                    if (hasListeners) {
                        deletedNodes.add(node);
                    }


                    deleted++;
                    if (eventLog.isDebugEnabled()) {
                        eventLog.debug("removed node: " + node.getPrototype() + "/" +
                                node.getID());
                    }
                }


                node.clearWriteLock();

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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 (loggerMap) {
      instance = (Log) loggerMap.get(name);
      if (instance == null) {
        Logger logger = LoggerFactory.getLogger(name);

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  public void verify() throws IOException, ClassNotFoundException {
    ByteArrayInputStream bis = new ByteArrayInputStream(baos.toByteArray());
    ois = new ObjectInputStream(bis);


    Log resuscitatedLog = (Log) ois.readObject();
    // tests that the "private transient Logger logger" field is non-null
    resuscitatedLog.debug("");
    resuscitatedLog.isDebugEnabled();
  }

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    oos.writeObject(log);
    verify();
  }


  public void testSmoke() throws Exception {
    Log log = LogFactory.getLog("testing");
    oos.writeObject(log);
    verify();
  }

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            Object obj = ObjectUtils.instantiateSafely(providerClazz);
            if(obj != null && (obj instanceof FunctionProvider)) {
                FunctionProvider provider = (FunctionProvider) obj;
                final List<? extends BuiltInFunction> funcs = provider.injectedFunctions();
                if(funcs != null) {
                    final Log LOG = LogFactory.getLog(PredefinedFunctions.class);
                    for(BuiltInFunction f : funcs) {
                        QualifiedName qname = f.getName();
                        String name = QNameUtil.toLexicalForm(qname);
                        String prefix = qname.getPrefix();
                        if(BuiltInFunction.EXT_NSPREFIX.equals(prefix)) {
                            table.put(name, f);
                            String clazzName = f.getClass().getName();
                            r.put(name, clazzName);
                        } else {
                            LOG.warn("loading a BuiltInFunction is discarded: " + name);
                        }


                    }
                }
            } else {
                Log LOG = LogFactory.getLog(PredefinedFunctions.class);
                LOG.warn("Illegal FunctionProvider: " + providerClazz);
            }
        }
    }

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            return invoked;
        }
    }
    
    protected Log getLog(JoinPoint jp) {
        Log log = null;
        try {
            LogDebug logdebug = this.getMethod(jp).getAnnotation(LogDebug.class);
            Class clazz = logdebug.loggerClass();
            if (clazz == null) clazz = LogDebugInterceptor.class;
            log = LogFactory.getLog(clazz);

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        return log;
    }
    
    @Before("@annotation(es.internna.annotations.LogDebug)")
    public void beforeLog(JoinPoint jp) {
        Log log = this.getLog(jp);
        if (log.isDebugEnabled()) {
            log.debug(this.getMethod(jp));
            for (Object o : jp.getArgs())
            {
                if (o != null)
                {
                    log.debug("PARAMETER " + o.getClass().getSimpleName());
                    log.debug(o.toString());
                }
            }
        }
    }

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