Package de.christofreichardt.diagnosis

Class DebugLogTee<T extends AbstractTracer>

java.lang.Object

de.christofreichardt.diagnosis.AbstractTracer

de.christofreichardt.diagnosis.DebugLogTee<T>

Type Parameters:

T - The actual tracer type

Direct Known Subclasses:

FileTracerLogTee

public abstract class DebugLogTee<T extends AbstractTracer>
extends AbstractTracer

An abstract base class which provides the environment to connect additionally to another log system, such as log4j. This class honors the contract of the AbstractTracer base class but does so by wrapping and delegating to another AbstractTracer. Besides two abstract adapt methods must be implemented to route log messages to the desired log system. Note that the wrapped tracer instance must not be a NullTracer. An adapter which is only interested in logging messages and wants to discard the additional tracing information altogether should be derived directly from the NullTracer.

Author:

Christof Reichardt

Nested Class Summary

Nested classes/interfaces inherited from class de.christofreichardt.diagnosis.AbstractTracer

AbstractTracer.Exception

Field Summary

Fields

Modifier and Type	Field	Description
protected T	tracer	Some tracer.

Fields inherited from class de.christofreichardt.diagnosis.AbstractTracer

VERSION

Constructor Summary

Constructors

Constructor	Description
DebugLogTee(String name, T tracer)	Constructor expects the name of the tracer and the to be wrapped Tracer instance.

Method Summary

Modifier and Type	Method	Description
protected abstract void	adapt(LogLevel logLevel, String message, Class<?> clazz)	Derived classes should provide code which routes the given message with the denoted logLevel and class to the desired log system.
protected abstract void	adapt(LogLevel logLevel, Throwable throwable, Class<?> clazz)	Derived classes should provide code which routes the given throwable with the denoted logLevel and class to the desired log system.
void	close()	Derived classes should provide code that closes the output streams.
TraceMethod	entry(String methodSignature)	Deprecated.
TraceMethod	entry(String returnType, Class<?> clazz, String methodSignature)	Indicates an entering of a method which belongs to a class.
TraceMethod	entry(String returnType, Object object, String methodSignature)	Indicates an entering of a method which belongs to an object.
int	getBufferSize()	Gives the buffer size of the actual TracePrintStream.
String	getName()	The name of the tracer.
void	initCurrentTracingContext()	Initialises the current tracing context by taking the values for debugLevel and online from the configured debug map.
void	initCurrentTracingContext(int debugLevel, boolean online)	Initialises the current tracing context with the given debugLevel and online state.
boolean	isAutoflush()	Indicates whether the output stream will be flushed when leaving a method by AbstractTracer.wayout().
boolean	isOpened()	Indicates whether the actual TracePrintStream is opened.
void	logException(LogLevel logLevel, Throwable throwable, Class<?> clazz, String methodName)	Logs an exception with the given logLevel and the originating class.
void	logMessage(LogLevel logLevel, String message, Class<?> clazz, String methodName)	Logs a message with the given logLevel and the originating class.
void	open()	Derived classes should provide code that opens the respective output streams.
IndentablePrintStream	out()	Returns some kind of IndentablePrintStream based upon the current managed stack size, the configured debug level and the online state of the current tracing context.
protected void	readConfiguration(XPath xpath, Node node)	Reads the configuration for this particular tracer instance by evaluating the given node with the given xpath engine.
void	setAutoflush(boolean autoflush)	Used during the configuration.
void	setBufferSize(int bufferSize)	Configures the buffer size of the actual TracePrintStream.
TraceMethod	wayout()	Indicates the exiting of a method.

Methods inherited from class de.christofreichardt.diagnosis.AbstractTracer

clearCurrentTracingContext, formatStreamErrorState, formatVersionInfo, getBufferedOutputStream, getLevel, getNullPrintStream, getThreadMap, getTracePrintStream, isOnline, out, setBufferedOutputStream, setOpened, setTracePrintStream

Methods inherited from class java.lang.Object

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

Field Detail

tracer

protected final T extends AbstractTracer tracer

Some tracer.

Constructor Detail

DebugLogTee

public DebugLogTee(String name,
                   T tracer)

Constructor expects the name of the tracer and the to be wrapped Tracer instance.

Parameters:

name - the name of the tracer

tracer - the to be wrapped tracer (must not be a NullTracer instance)

Method Detail

getBufferSize

public final int getBufferSize()

Description copied from class: AbstractTracer

Gives the buffer size of the actual TracePrintStream.

Overrides:

getBufferSize in class AbstractTracer

Returns:

the bufferSize

isAutoflush

public final boolean isAutoflush()

Description copied from class: AbstractTracer

Indicates whether the output stream will be flushed when leaving a method by AbstractTracer.wayout().

Overrides:

isAutoflush in class AbstractTracer

Returns:

the autoflush

isOpened

public final boolean isOpened()

Description copied from class: AbstractTracer

Indicates whether the actual TracePrintStream is opened.

Overrides:

isOpened in class AbstractTracer

Returns:

the opened

getName

public final String getName()

Description copied from class: AbstractTracer

The name of the tracer.

Overrides:

getName in class AbstractTracer

Returns:

the name

setBufferSize

public final void setBufferSize(int bufferSize)

Description copied from class: AbstractTracer

Configures the buffer size of the actual TracePrintStream.

Overrides:

setBufferSize in class AbstractTracer

Parameters:

bufferSize - the bufferSize to set

setAutoflush

public final void setAutoflush(boolean autoflush)

Description copied from class: AbstractTracer

Used during the configuration. Indicates whether the output stream will be flushed when leaving a method by AbstractTracer.wayout().

Overrides:

setAutoflush in class AbstractTracer

Parameters:

autoflush - the autoflush to set

readConfiguration

protected final void readConfiguration(XPath xpath,
                                       Node node)
                                throws XPathExpressionException,
                                       AbstractTracer.Exception

Description copied from class: AbstractTracer

Reads the configuration for this particular tracer instance by evaluating the given node with the given xpath engine.

Overrides:

readConfiguration in class AbstractTracer

Parameters:

xpath - the xpath engine

node - the config node

Throws:

XPathExpressionException - indicates xpath problems

AbstractTracer.Exception - indicates problems when configuring certain tracer instances

open

public void open()

Description copied from class: AbstractTracer

Derived classes should provide code that opens the respective output streams.

Specified by:

open in class AbstractTracer

close

public void close()

Description copied from class: AbstractTracer

Derived classes should provide code that closes the output streams.

Specified by:

close in class AbstractTracer

initCurrentTracingContext

public final void initCurrentTracingContext()

Description copied from class: AbstractTracer

Initialises the current tracing context by taking the values for debugLevel and online from the configured debug map.

Overrides:

initCurrentTracingContext in class AbstractTracer

initCurrentTracingContext

public final void initCurrentTracingContext(int debugLevel,
                                            boolean online)

Description copied from class: AbstractTracer

Initialises the current tracing context with the given debugLevel and online state.

Overrides:

initCurrentTracingContext in class AbstractTracer

Parameters:

debugLevel - controls the extent of the output

online - a value of false delivers no output of the current thread at all whereas a value of true delivers output controlled by debugLevel

adapt

protected abstract void adapt(LogLevel logLevel,
                              String message,
                              Class<?> clazz)

Derived classes should provide code which routes the given message with the denoted logLevel and class to the desired log system.

Parameters:

logLevel - the to be translated LogLevel

message - the actual message

clazz - the class context of the message

adapt

protected abstract void adapt(LogLevel logLevel,
                              Throwable throwable,
                              Class<?> clazz)

Derived classes should provide code which routes the given throwable with the denoted logLevel and class to the desired log system.

Parameters:

logLevel - the to be translated LogLevel

throwable - references the to be logged info

clazz - the class context of the message

entry

public TraceMethod entry(String returnType,
                         Class<?> clazz,
                         String methodSignature)

Description copied from class: AbstractTracer

Indicates an entering of a method which belongs to a class. If a TracingContext exists for the current thread a TraceMethod object will be created and thereupon pushed onto the stack of a ThreadMap.

Overrides:

entry in class AbstractTracer

Parameters:

returnType - the return type of the method as string representation

clazz - the class to which that method belong

methodSignature - the remaining method signature (without return type) inclusive parameter as string representation

Returns:

the TraceMethod which has been put onto the stack - a mere data object for internal use primarily. May be null.

entry

public TraceMethod entry(String returnType,
                         Object object,
                         String methodSignature)

Description copied from class: AbstractTracer

Indicates an entering of a method which belongs to an object. If a TracingContext exists for the current thread a TraceMethod object will be created and thereupon pushed onto the stack of a ThreadMap.

Overrides:

entry in class AbstractTracer

Parameters:

returnType - the return type of the method as string representation

object - the object that owns the method

methodSignature - the remaining method signature (without return type) inclusive parameter as string representation

Returns:

the TraceMethod which has been put onto the stack - a mere data object for internal use primarily. May be null.

entry

@Deprecated
public TraceMethod entry(String methodSignature)

Deprecated.

Description copied from class: AbstractTracer

Indicates an entering of a method.

Overrides:

entry in class AbstractTracer

Parameters:

methodSignature - the signature of the method as string representation

Returns:

the TraceMethod which has been put onto the stack - a mere data object for internal use primarily. May be null.

logMessage

public final void logMessage(LogLevel logLevel,
                             String message,
                             Class<?> clazz,
                             String methodName)

Description copied from class: AbstractTracer

Logs a message with the given logLevel and the originating class.

Overrides:

logMessage in class AbstractTracer

Parameters:

logLevel - one of the predefined levels INFO, WARNING, ERROR, FATAL and SEVERE

message - the to be logged message

clazz - the originating class

methodName - the originating method

logException

public final void logException(LogLevel logLevel,
                               Throwable throwable,
                               Class<?> clazz,
                               String methodName)

Description copied from class: AbstractTracer

Logs an exception with the given logLevel and the originating class.

Overrides:

logException in class AbstractTracer

Parameters:

logLevel - one of the predefined levels INFO, WARNING, ERROR, FATAL and SEVERE

throwable - the to be logged throwable

clazz - the originating class

methodName - the name of the relevant method

wayout

public TraceMethod wayout()

Description copied from class: AbstractTracer

Indicates the exiting of a method.

Overrides:

wayout in class AbstractTracer

Returns:

the TraceMethod which has been popped from the stack - a mere data object for internal use primarily. May be null.

out

public final IndentablePrintStream out()

Description copied from class: AbstractTracer

Returns some kind of IndentablePrintStream based upon the current managed stack size, the configured debug level and the online state of the current tracing context. This is the NullPrintStream if the stack size is greater than the debug level or if the thread is offline. Otherwise, it's the TracePrintStream.

Overrides:

out in class AbstractTracer

Returns:

an IndentablePrintStream