Package org.apache.log4j.chainsaw
Class ChainsawAppender
java.lang.Object
org.apache.log4j.AppenderSkeleton
org.apache.log4j.chainsaw.ChainsawAppender
- All Implemented Interfaces:
org.apache.log4j.Appender
,org.apache.log4j.spi.OptionHandler
public class ChainsawAppender
extends org.apache.log4j.AppenderSkeleton
ChainsawAppender receives LoggingEvents from the local
Log4J environment, and appends them into a model that
can be used inside a Swing GUI
- Version:
- 1.0
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate org.apache.log4j.Appender
private String
private String
private static ChainsawAppender
The in-JVM singleton instance of the ChainsawAppender.private String
The classname of the viewer to create to view the events.Fields inherited from class org.apache.log4j.AppenderSkeleton
closed, errorHandler, headFilter, layout, name, tailFilter, threshold
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Constructor Summary
ConstructorsConstructorDescriptionConstructor, initialises the singleton instance of the appender -
Method Summary
Modifier and TypeMethodDescriptionvoid
Instantiates and activates an instance of a ChainsawViewer to view the contents of this appender.protected void
append
(org.apache.log4j.spi.LoggingEvent aEvent) Appends the eventvoid
close()
Close does nothingorg.apache.log4j.Appender
Returns value of the Application option.(package private) static ChainsawAppender
Return the singleton instance of the ChainsawAppender, it should only be initialised once.Gets the viewer class to use to view the events.boolean
This appender does not require layout and so return falsevoid
setAppender
(org.apache.log4j.Appender appender) void
setApplication
(String lapp) The Application option takes a string value which should be the name of the application getting loggedvoid
setViewerClass
(String classname) Sets the viewer class to use to view the events.Methods inherited from class org.apache.log4j.AppenderSkeleton
addFilter, clearFilters, doAppend, finalize, getErrorHandler, getFilter, getFirstFilter, getLayout, getName, getThreshold, isAsSevereAsThreshold, setErrorHandler, setLayout, setName, setThreshold
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Field Details
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appender
private org.apache.log4j.Appender appender -
viewerClassname
The classname of the viewer to create to view the events. -
hostname
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application
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Constructor Details
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ChainsawAppender
public ChainsawAppender()Constructor, initialises the singleton instance of the appender
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Method Details
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getInstance
Return the singleton instance of the ChainsawAppender, it should only be initialised once.- Returns:
- the One and only instance of the ChainsawAppender that is allowed to be referenced by the GUI
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requiresLayout
public boolean requiresLayout()This appender does not require layout and so return false- Returns:
- false and only false
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getAppender
public org.apache.log4j.Appender getAppender() -
setAppender
public void setAppender(org.apache.log4j.Appender appender) -
append
protected void append(org.apache.log4j.spi.LoggingEvent aEvent) Appends the event- Specified by:
append
in classorg.apache.log4j.AppenderSkeleton
- Parameters:
aEvent
- the LoggingEvent to append
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activateOptions
public void activateOptions()Instantiates and activates an instance of a ChainsawViewer to view the contents of this appender.- Specified by:
activateOptions
in interfaceorg.apache.log4j.spi.OptionHandler
- Overrides:
activateOptions
in classorg.apache.log4j.AppenderSkeleton
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close
public void close()Close does nothing -
setViewerClass
Sets the viewer class to use to view the events. The class must implement the ChainsawViewer interface.- Parameters:
classname
- The class name of the viewer class.
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getViewerClass
Gets the viewer class to use to view the events.- Returns:
- The class name of the viewer class.
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setApplication
The Application option takes a string value which should be the name of the application getting logged -
getApplication
Returns value of the Application option.
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