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It also may be helpful for you to create a use case diagram first, to provide basic structure and context for the flow of the sequence diagram. The first thing you will need to do before making a sequence diagram is decide on the tool you will use to create it.

SEQUENCE DIAGRAM IFELSE HOW TO

The “ref” or reference fragment indicates an interaction defined on another diagram.īack to top How to Make a Sequence Diagram The “neg” or negative fragment represents invalid interactions.

The “loop” fragment repeats multiple times in a row. The “par” or parallel fragment represents simultaneous paths. The “opt” or optional fragment will either occur or not occur based on the conditions. The “alt” or alternative fragment represents mutually exclusive alternative paths. Here are some of the types of fragments that you might need in order to accurately describe a process in your sequence diagram. They are helpful when managing complex interactions because of the extra context they provide.Ī sequence fragment is a box around a section of the diagram with a label that describes its purpose. Sequence fragments, a new addition to UML 2.0, provide helpful notation to make sequence diagrams more detailed and accurate. Connect notes to objects with a dotted line. Notes are not required and are not an official sequence diagram element, but they can be used to provide additional information as needed. The length of the activation bar depends on the length of activity. Activation barsĪctivation bars are vertical rectangles on a lifeline that make it clear at a glance when each part of the system is active throughout the process. Some systems even have reflexive messages, meaning a lifeline sends a message back to itself, which is shown with an arrow looping back to the original sender. There are a few other, more specific types of messages, such as “create” and “destroy” messages, but the three listed above are the most commonly used in basic sequence diagrams. Return messages are sent back to the original sender after a message is received and these are represented by a dashed line with a lined arrowhead.Asynchronous messages don’t need a reply from the receiving lifeline in order to continue and are represented by a solid line with a lined arrowhead.Synchronous messages require a reply from the receiving lifeline in order for interaction to continue and are represented by a solid line with a solid arrowhead.The type of arrow depends on the type of message: Messages are communication between objects and are represented with arrows. Lifelines are vertical lines used to represent objects that send and receive interactions throughout the sequence. A single sequence diagram can describe just one scenario or multiple scenarios. ScenariosĪ scenario is the systematic execution of one specific path. It’s usually helpful to define use cases before creating a sequence diagram, as this will provide necessary context for the diagram’s structure. Use cases in UML are specifications of a sequence of events performed by a system, including its variants.

Here are a few of the terms and symbols you will need to know before creating a sequence diagram.

SEQUENCE DIAGRAM IFELSE CODE

However, they can be created any time as a way to document existing systems.Īlthough sequence diagrams are very technical, they still provide a slightly higher-level view than code itself, so they can also be used to communicate system requirements to business executives and other non-technical stakeholders. Architects and developers use them to visualize how the system should behave and provide a helpful framework to use throughout the design process. Sequence diagrams are often created and used during a future system’s planning phase. They represent the details of a UML use case and the logic behind how objects and components interact with each other throughout a process. Sequence diagrams are most commonly used by technical teams. TRY GLIFFY What is a Sequence Diagram Used For?

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To add a sequence diagram directly to your Confluence documentation, add Gliffy to your Confluence space (it's free for 30 days!): Sequence diagrams are an important type of application architecture diagram to include in technical documentation because they outline system requirements, making them a valuable planning, decision-making, and onboarding resource.

Common Sequence Diagram Symbols and NotationĪ sequence diagram, also sometimes called an event diagram, is a type of UML interaction diagram that illustrates the interactions between objects in a system in the order that they occur.

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