Package de.gebit.integrity.runner.console.intercept

Class DefaultConsoleOutputInterceptor

java.lang.Object

de.gebit.integrity.runner.console.intercept.DefaultConsoleOutputInterceptor

All Implemented Interfaces:

ConsoleOutputInterceptor

public class DefaultConsoleOutputInterceptor
extends Object
implements ConsoleOutputInterceptor

Default implementation of a console output interceptor. Hooks the System.out and System.err streams to do its work, thus it is critical that there's only one instance of this service in a given JVM. This imlementation automatically hooks the streams when at least one target is registered, and unhooks them when the last target unregisters.

Author:

Rene Schneider - initial API and implementation

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	DefaultConsoleOutputInterceptor.InterceptPrintStream	This stream is the core of this service: it captures all data being printed through it, splits it into single lines and forwards the lines to all targets.

Field Summary

Fields

Modifier and Type	Field	Description
protected DefaultConsoleOutputInterceptor.InterceptPrintStream	interceptStderr	The interceptor stream for STDERR.
protected DefaultConsoleOutputInterceptor.InterceptPrintStream	interceptStdout	The interceptor stream for STDOUT.
protected PrintStream	stderr	The original STDERR stream.
protected PrintStream	stdout	The original STDOUT stream.
protected List<ConsoleInterceptorTarget>	targets	The interception targets.
protected Object	targetSync	A sync object used to synchronize interception target access.

Constructor Summary

Constructors

Constructor	Description
DefaultConsoleOutputInterceptor()

Method Summary

Modifier and Type	Method	Description
void	printlnStdErr(String aLine)	Prints a line on the original System.err stream, including an added newline.
void	printlnStdOut(String aLine)	Prints a line on the original System.out stream, including an added newline.
void	printStdErr(String aText)	Prints text on the original System.err stream.
void	printStdOut(String aText)	Prints text on the original System.out stream.
void	registerTarget(ConsoleInterceptorTarget aTarget)	Registers a target for intercepted data.
void	unregisterTarget(ConsoleInterceptorTarget aTarget)	Unregisters a registered target.
protected void	updateStreamCapture()	Reevaluates whether the streams are to be captured at the time of calling, and hooks or unhooks the streams as necessary.

Methods inherited from class java.lang.Object

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

Field Detail

targetSync

protected final Object targetSync

A sync object used to synchronize interception target access.

targets

protected List<ConsoleInterceptorTarget> targets

The interception targets.

stdout

protected final PrintStream stdout

The original STDOUT stream.

interceptStdout

protected DefaultConsoleOutputInterceptor.InterceptPrintStream interceptStdout

The interceptor stream for STDOUT.

stderr

protected final PrintStream stderr

The original STDERR stream.

interceptStderr

protected DefaultConsoleOutputInterceptor.InterceptPrintStream interceptStderr

The interceptor stream for STDERR.

Constructor Detail

DefaultConsoleOutputInterceptor

public DefaultConsoleOutputInterceptor()

Method Detail

updateStreamCapture

protected void updateStreamCapture()

Reevaluates whether the streams are to be captured at the time of calling, and hooks or unhooks the streams as necessary.

registerTarget

public void registerTarget(ConsoleInterceptorTarget aTarget)

Description copied from interface: ConsoleOutputInterceptor

Registers a target for intercepted data.

Specified by:

registerTarget in interface ConsoleOutputInterceptor

Parameters:

aTarget - the target to register

unregisterTarget

public void unregisterTarget(ConsoleInterceptorTarget aTarget)

Description copied from interface: ConsoleOutputInterceptor

Unregisters a registered target.

Specified by:

unregisterTarget in interface ConsoleOutputInterceptor

Parameters:

aTarget - the target to unregister

printlnStdErr

public void printlnStdErr(String aLine)

Description copied from interface: ConsoleOutputInterceptor

Prints a line on the original System.err stream, including an added newline. Automatically flushes the stream.

Specified by:

printlnStdErr in interface ConsoleOutputInterceptor

Parameters:

aLine - the line

See Also:

PrintWriter.println(String)

printStdErr

public void printStdErr(String aText)

Description copied from interface: ConsoleOutputInterceptor

Prints text on the original System.err stream.

Specified by:

printStdErr in interface ConsoleOutputInterceptor

Parameters:

aText - the text to print

See Also:

PrintWriter.print(String)

printlnStdOut

public void printlnStdOut(String aLine)

Description copied from interface: ConsoleOutputInterceptor

Prints a line on the original System.out stream, including an added newline. Automatically flushes the stream.

Specified by:

printlnStdOut in interface ConsoleOutputInterceptor

Parameters:

aLine - the line

See Also:

PrintWriter.println(String)

printStdOut

public void printStdOut(String aText)

Description copied from interface: ConsoleOutputInterceptor

Prints text on the original System.out stream.

Specified by:

printStdOut in interface ConsoleOutputInterceptor

Parameters:

aText - the text to print

See Also:

PrintWriter.print(String)