![]() ![]() UML sequence diagrams are visual representations of object interactions in a system and can provide valuable information for program comprehension, debugging, maintenance, and software archeology. Sequence diagrams generated from legacy code are independent of existing documentation that may have eroded. We present a framework for static generation of UML sequence diagrams from object-oriented source code. The framework provides a query refinement system to guide the user to interesting interactions in the source code. Our technique involves constructing a hypergraph representation of the source code, traversing the hypergraph with respect to a user-defined query, and generating the corresponding set of sequence diagrams. We implemented our framework as a tool, StaticGen (supporting software: StaticGen), analyzing a corpus of 30 Android applications. We provide experimental results demonstrating the efficacy of our technique (originally appeared in the Proceedings of Fundamental Approaches to Software Engineering-20th International Conference, FASE 2017, Held as Part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2017, Uppsala, Sweden, April 22–29, 2017). Legacy object-oriented code may be accompanied by high-level documentation and/or descriptive comments in the source code, each of which may contain omissions or erroneous information. As documentation erodes, an engineer can trust only the source code. ![]() A necessary component of software archeology in object-oriented systems is the interactions among objects. A sequence diagram is a visual representation of those object interactions as well as their lifelines. Sequence diagrams generated from legacy code are independent of existing documentation. Dynamic techniques for generation of sequence diagrams from legacy code can synthesize a subset of all possible sequence diagrams based on runtime traces. The capability of purely dynamic reverse-engineering techniques to produce useful diagrams depends on the quality of the executions. In particular, one may need a large number of executions with sufficient diversity to cover the space of interactions. Existing static techniques result in sequence diagrams that replicate the original legacy source code, including conditionals and loops, without providing further intuitive notions beyond the code itself. Hybrid techniques like combine static and dynamic analysis. ![]() Information extracted from an accurate static analysis framework can guide the executions during the dynamic stage. In ZenUML, you can create conditional interactions using exact same way you do in your program languages.1, for static generation of UML sequence diagrams Footnote 1 together with a query system to guide the user to the most interesting interactions in the (unobfuscated) source code Footnote 2 Given an existing object-oriented code base as input, our technique involves three distinct steps as shown in Fig. Only when the condition is true does the sequence of events within that partition occur. The guard condition is a boolean expression that shows when the branch should be taken. Each section represents a branch of execution, and you annotate it with a guard condition.In your modelled sequence, you return a PIN in the reply message 2. Thought, this makes it hard for a program to determine what you are modelling and what is your intended sequence. In such a usage it can be ok to use the syntax in a less strict form. Divide the rectangle into sections for each alternative path. Obviously you are using the sequence diagram as an analysis tool, not a design tool.Draw a rectangle called a combined fragment and label it with alt.The alt fragment is used to represent alternative paths it's the UML equivalent of an if-else statement. But how do we illustrate an "if this, then that" scenario in a sequence diagram?Įnter the alt fragment. The same need to represent decision-making processes arises in sequence diagrams. When coding, conditional logic is instrumental in controlling the flow of execution. We'll also dive into the intriguing world of combined fragments such as alt, opt, loop, and break. Today, we're going to kick it up a notch and explore how to represent conditional logic (like if-else statements) and loops (for, while) in sequence diagrams. Welcome back to our series on UML Sequence Diagrams! In our previous posts, we've walked through the basics of sequence diagrams and how they can help us visualize the interactions between objects in our system. Advanced Uses of Sequence Diagrams: Conditions and Loops ![]()
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