org.camunda.commons.logging

Class BaseLogger

java.lang.Object

org.camunda.commons.logging.BaseLogger

public abstract class BaseLogger
extends Object

Base class for implementing a logger class. A logger class is a class with dedicated methods for each log message:

 public class MyLogger extends BaseLogger {

   public static MyLogger LOG = createLogger(MyLogger.class, "MYPROJ", "org.example", "01");

   public void engineStarted(long currentTime) {
     logInfo("100", "My super engine has started at '{}'", currentTime);
   }

 }
 

The logger can then be used in the following way:

 LOG.engineStarted(System.currentTimeMilliseconds());
 

This will print the following message:

 INFO  org.example - MYPROJ-01100 My super engine has started at '4234234523'
 

Slf4j

This class uses slf4j as logging API. The class ensures that log messages and exception messages are always formatted using the same template.

Log message format

The log message format produced by this class is as follows:

 [PROJECT_CODE]-[COMPONENT_ID][MESSAGE_ID] message
 

Example:

 MYPROJ-01100 My super engine has started at '4234234523'
 

Author:

Daniel Meyer, Sebastian Menski

Field Summary

Fields

Modifier and Type	Field and Description
protected String	componentId the component Id of the logger.
protected org.slf4j.Logger	delegateLogger the slf4j logger we delegate to
protected String	projectCode the project code of the logger

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BaseLogger()

Method Summary

Methods

Modifier and Type	Method and Description
static <T extends BaseLogger> T	createLogger(Class<T> loggerClass, String projectCode, String name, String componentId) Creates a new instance of the Logger.
protected String	exceptionMessage(String id, String messageTemplate, Object... parameters) Prepares an exception message
protected String	formatMessageTemplate(String id, String messageTemplate) Formats a message template
boolean	isDebugEnabled()
boolean	isErrorEnabled()
boolean	isInfoEnabled()
boolean	isWarnEnabled()
protected void	logDebug(String id, String messageTemplate, Object... parameters) Logs a 'DEBUG' message
protected void	logError(String id, String messageTemplate, Object... parameters) Logs an 'ERROR' message
protected void	logInfo(String id, String messageTemplate, Object... parameters) Logs an 'INFO' message
protected void	logWarn(String id, String messageTemplate, Object... parameters) Logs an 'WARN' message

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

delegateLogger

protected org.slf4j.Logger delegateLogger

the slf4j logger we delegate to

projectCode

protected String projectCode

the project code of the logger

componentId

protected String componentId

the component Id of the logger.

Constructor Detail

BaseLogger

protected BaseLogger()

Method Detail

createLogger

public static <T extends BaseLogger> T createLogger(Class<T> loggerClass,
                                    String projectCode,
                                    String name,
                                    String componentId)

Creates a new instance of the Logger.

Parameters:

loggerClass - the type of the logger

projectCode - the unique code for a complete project.

name - the name of the slf4j logger to use.

componentId - the unique id of the component.

logDebug

protected void logDebug(String id,
            String messageTemplate,
            Object... parameters)

Logs a 'DEBUG' message

Parameters:

id - the unique id of this log message

messageTemplate - the message template to use

parameters - a list of optional parameters

logInfo

protected void logInfo(String id,
           String messageTemplate,
           Object... parameters)

Logs an 'INFO' message

Parameters:

id - the unique id of this log message

messageTemplate - the message template to use

parameters - a list of optional parameters

logWarn

protected void logWarn(String id,
           String messageTemplate,
           Object... parameters)

Logs an 'WARN' message

Parameters:

id - the unique id of this log message

messageTemplate - the message template to use

parameters - a list of optional parameters

logError

protected void logError(String id,
            String messageTemplate,
            Object... parameters)

Logs an 'ERROR' message

Parameters:

id - the unique id of this log message

messageTemplate - the message template to use

parameters - a list of optional parameters

isDebugEnabled

public boolean isDebugEnabled()

Returns:

true if the logger will log 'DEBUG' messages

isInfoEnabled

public boolean isInfoEnabled()

Returns:

true if the logger will log 'INFO' messages

isWarnEnabled

public boolean isWarnEnabled()

Returns:

true if the logger will log 'WARN' messages

isErrorEnabled

public boolean isErrorEnabled()

Returns:

true if the logger will log 'ERROR' messages

formatMessageTemplate

protected String formatMessageTemplate(String id,
                           String messageTemplate)

Formats a message template

Parameters:

id - the id of the message

messageTemplate - the message template to use

Returns:

the formatted template

exceptionMessage

protected String exceptionMessage(String id,
                      String messageTemplate,
                      Object... parameters)

Prepares an exception message

Parameters:

id - the id of the message

messageTemplate - the message template to use

parameters - the parameters for the message (optional)

Returns:

the prepared exception message