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MoDeC: an instrumentor, invoker, and meta-model to collect and model execution traces of Java programs.
- “MoDeC Bytecode Instrumentation” (and “MoDeC Bytecode Instrumentation Tests”) deals with the instrumentation of the bytecodes of the Java programs of which a user wants to collect execution traces (called target Java program).
- “MoDeC Invoker” allows the user to simply calls the instrumented Java program (i.e., to run the instrumented bytecodes of the target Java program.
- “MoDeC Metamodel” declares a meta-model of the execution traces produced by the “MoDeC Bytecode Instrumentation” and provides a parser to instantiate the MoDeC meta-model to obtain a model of a given execution trace.
- “MoDeC Solver” (and “MoDeC Solver Tests) defines constaints and problems to identify occurrences of behavioural and creational design motifs in models of execution traces.
Steps to gather execution traces of some target program.
(1) Instrument the bytecode of the target program, using “modec.util.Instrumentor.instrumentClasses(String)”, see examples in “modec.util.Instrumentor.main(String)”. The input of the “instrumentClasses” method is a file describing:
See for a complete example “MoDeC Bytecode Instrumentation Tests/Input Files/Evaluation of ArgoUML v0.19.8.txt”.
The list of paths to the Java class files to instrument can be generated using “modec.tool.helper.ClassFileListGenerator.main(String)”.
(2) Execute the instrumented target program, using “modec.tool.Invoker.invokeMainClass(String)”, see examples in “modec.tool.Invoker.main(String)”. Running the “Invoker” will launch the instrumented target program and open a new window. The new window shows only one button and a text field, used to insert marks (also called tags) at any user-chosen appropriate moment in the collected execution traces, for example before and after executing some particular feature.