#UML SEQUENCE DIAGRAM IF ELSE CODE#

The following diagram shows an object being created and destroyed.īy default, a message is shown as a horizontal line. In the former case, the symbol at the head of the lifeline is shown at a lower level down the page than the symbol of the object that caused the creation. In the latter case, the lifeline is terminated by a stop symbol, represented as a cross. They are denoted going to or coming from an endpoint element.Ī lifeline may be created or destroyed during the timescale represented by a sequence diagram. Found messages are those that arrive from an unknown sender, or from a sender not shown on the current diagram. Lost messages are those that are either sent but do not arrive at the intended recipient, or which go to a recipient not shown on the current diagram. It is shown as creating a nested focus of control in the lifeline’s execution occurrence. The first is the source object sending two messages and receiving two replies the second is the target object receiving a synchronous message and returning a reply and the third is the target object receiving an asynchronous message and returning a reply.Ī self message can represent a recursive call of an operation, or one method calling another method belonging to the same object. In the previous diagram, there are three execution occurrences. In the following diagram, the first message is a synchronous message (denoted by the solid arrowhead) complete with an implicit return message the second message is asynchronous (denoted by line arrowhead), and the third is the asynchronous return message (denoted by the dashed line).Ī thin rectangle running down the lifeline denotes the execution occurrence, or activation of a focus of control. Messages can be complete, lost or found synchronous or asynchronous call or signal.

Boundary, control and entity elements from robustness diagrams can also own lifelines.

This will usually be the case if the sequence diagram is owned by a use case. Sometimes a sequence diagram will have a lifeline with an actor element symbol at its head. If its name is 'self', that indicates that the lifeline represents the classifier which owns the sequence diagram. A lifeline will usually have a rectangle containing its object name. Sequence diagrams are not intended for showing complex procedural logic.Ī lifeline represents an individual participant in a sequence diagram. Sequence diagrams are good at showing which objects communicate with which other objects and what messages trigger those communications. jar file which consumes the specification files (which can be used with other UML document tools as well).UML 2 Tutorial - Sequence Diagram Sequence DiagramsĪ sequence diagram is a form of interaction diagram which shows objects as lifelines running down the page, with their interactions over time represented as messages drawn as arrows from the source lifeline to the target lifeline. There are constraints imposed on diagram specifications, so one cannot model something that is impossible to implement.Īll it requires is Java (for your platform), the downloadable is an executable.

#UML SEQUENCE DIAGRAM IF ELSE CODE#

Diagram code is instantly checked, errors are pointed at.It also supports inline annotations (comments) as well as conditional (branching) IF/ELSE logic.Ĭode is evaluated/rendered as you add the code so that it is impossible to model a sequence with invalid object names.įrom the site, here are the principal features:

Services (or classes) are declared first, and then subsequent code calls out the service behaviour (request/response, arguments). The tool uses a pseudo code syntax to produce (render) the sequence diagrams. Using this tool, you can effectively call out the interface definitions of your distributed services or service library. Since then, I have been recently introduced to, of all things, a Java based tool called the ‘ Quick Sequence Diagram Editor’ which can be used to produce really useful UML Call Sequence Diagrams. Surprisingly, there was only one response! Not long ago, I posed a question to the Stack Overflow community – (is there a) “ Good Visio Template (or alternative) for SOA/Distributed Systems?”.

Uml sequence diagram if else