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Listen/Java
Edward L. Gilmore II
Bryan P. Strait
Aditya P. Mathur
Purdue University
{gilmorel,apm,straitbp}@cs.purdue.edu
10.25.2002
Introduction
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What is Listen/Java?
Motivation
Overall architecture
Future experiments
Demonstrations
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What is Listen/Java?
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A tool for mapping program events to sound.
Provides automated code instrumentation to
investigate use of sound in computing
environments.
Listen Specification Language (LSL):
language for specifying aural events.
LSL/Java is an evolution of prior work done
with LSL/C.
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Motivation
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Investigate the usefulness of sound in
various software engineering-related tasks.
Use program auralization to improve quality
of simulations of telephone networks,
mechanical systems, and biological
systems.
Data analysis using aural cues.
Development of programming environments
for visually handicapped.
Research in novel approaches to music
composition.
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LSL/Java Environment:
Java source file
(J)
Compilation
Listen
Instrumented Java file
(J’)
javac
LSL spec. file
Generates table of
program events to
be auralized
LSL parser
Java parser
decorates parse
tree based on table
ListenEvent table
Java parser
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Instrumented File Overview
ListenMediaManager
class
Instrumented file
ListenEvent
class
includes
ListenSoundManager.play
(ListenEvent);
includes
JavaSound API
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Future Experiments
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Defibrillator
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Heart events corresponding to embedded
program events can be auralized to
monitor heart status
Network monitoring
Software testing & debugging
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Demos
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1) Program flow 
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Learning objective: to identify when a
program has entered and exited a while
loop.
2) Variable access 
Learning objective: to identify when a
specific variable has been used.
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