![]() P.S: this example shows 2 threads, but you can add more threads by adding more horizontal dashed lines. ![]() Graphically (see link), the combined fragment is represented as a boxed region in your sequence diagram, parallel sequences being separated by horizontal dashed lines (each of the slices would then correspond to one thread of execution. ![]() So how to show that interactions may happen in parallel ?įor representing parallelism, you would use a combined fragment introduced by the operator par. In principle, the sequence of the interactions with your object is indicated by the vertical order of the messages. It could be thread instantiations directly, or it could be several objects that are created in the context of the two threads.īut this is not sufficient. That makes this kind of system perfect for describing with a sequence diagram. Server-side web application: A Java EE web application running on Apache. Making a purchase online involves a lot of back and forth between the user, the store, the payment gateway, and even potentially a bank, if a transfer is involved. UML class) diagram can be used to zoom into an individual. Connectors will snap to shapes and never separate apart. Step-by-step guide to creating a sequence diagram for an online shopping system. As A-type and B-type sequence diagrams differ from. Easy to use: Create and connect shapes with drag and drop. You would also represent with a lifeline each threaded object that interact with your shared object. the UML metamodel regarding sequence diagrams (in the Interactions context of the UML Superstructure). A sequence diagram consists of a group of objects that are represented by lifelines, and the messages that they exchange over time during the interaction. Sequence Diagrams are used to design, document, and validate the architecture, interface and logic of systems by describing the sequence of actions that need to be performed to complete a task. Edit the text to the left to update the diagram. The most frequently used ones in software development are: Use Case diagrams, Class diagrams, and Sequence diagrams. So your object that is shared between the threads should appear once and only once in the diagram. A sequence diagram is a Unified Modeling Language (UML) diagram that illustrates the sequence of messages between objects in an interaction. swimlanes.io is a simple online tool for creating sequence diagrams. In a sequence diagram, a lifeline represents an individual participant in the interaction.
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