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Questions tagged [sequence-diagram]

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When and how can I use an Entity created in a use case X' sequence inside another use case Y' sequence? [closed]

I have a use case X' sequence in which I create an Entity Z. I have another use case Y' sequence where I want to use the SAME already created Entity Z. How to do that? Do I have to specify it in some ...
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Sequence diagram question

For this question: Considering the following sequence diagram, it is CORRECT to state that: Select one or more: a. Message 4 might never be executed. b. Message 5 is not complete until the Customer ...
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1 vote
1 answer
170 views

In a sequence diagram, where do message parameters come from?

I'm drawing some sequence diagrams to give a graphical depiction of the use cases written during the requirements elicitation phase for my project. This is a simple one: Vote Post Use Case ...
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Drawing a sequence diagram for a "View posts in a section" use case

As title says, I'm currently working on an alaysis model for a little website similar to Reddit for academic purposes. I have one use cases written like this (They're not in English so they may not ...
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2 votes
4 answers
481 views

A single sequence diagram for the whole system?

Sequence diagrams are used to model use case scenarios i.e., main success scenarios and alternate scenarios. That's what I understand from Craig Larman's book. I understand that it depends a lot on ...
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2 votes
2 answers
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Actors and their representation in the system

I am trying to understand the relationship between actors and their representation in the system. Please see the below figure In the figure on left, I have an abstract representation of my system. In ...
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1 vote
1 answer
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Difference between Sequence Diagrams at Conceptual and Design

Recently I learned that sequence diagrams can be used at both requirements specification and design level. My search so far shows the boxes on top of the sequence diagrams used for design consist of ...
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1 answer
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when and how to use class responsibility collaboration cards vs sequence diagrams?

I've recently come across CRC cards and sequence diagrams at my university. Martin fowler has said that sequence diagrams are interchangeable with CRC cards when you're in the design phase of your ...
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1 answer
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How to return an new Object as Value ?[Sequence Diagram]

within the sequence diagram it is possible to return a value, with return of a method edge, however this is usually done with a simple numeric or string value. Is it possible to return a whole object? ...
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1 vote
1 answer
2k views

What can be an Actor in a subsystem sequence diagram?

I am doing a lot of sequence diagrams. We decided to start at a subsystem level of abstraction because we do not have all the details yet. In my diagrams I was using this definition of Actor: In UML, ...
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1 vote
1 answer
112 views

Is my Sequence diagram correct? I need some comments

It's a SEQ diagram designed for a smartwatch app to receive zone level of feeling from an adult with autism on their smartwatch and provide a recommendation based on their input. The scenario is like ...
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1 answer
451 views

How do I represent parallel (multiple) inputs in a UML Sequence diagrams?

I am new to UML sequence diagrams. I saw a few YouTube videos and a few tutorials such as this one. I have a system with multiple inputs, that can interact with the system asynchronously. For example,...
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1 answer
531 views

CRUD use case and relative sequence diagram

I'm building my project with Visual Paradigm and I have some use cases that implements the CRUD pattern. As specified in the book Use Cases: Patterns and Blueprints, Övergaard and Palmkvist suggest ...
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1 answer
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User registration flow UML diagrams

This my first UML diagram for user registration flow. After double checking the diagram I feel that I have a crowded diagram compared to what I can found in Google search. My questions: Are my alt ...
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1 vote
2 answers
110 views

Should the View pass data inserted from user to Controller or should the Controller get data from View's fields? (MVC Pattern)

My View has a textfield and a button. According to MVC pattern on button click should be called a function of the controller. This function should do some operation on the View's textfield content. It ...
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3 votes
2 answers
7k views

How to write UI in sequence diagram?

So i want to make a sequence diagram for login .. the first step is user access my website then the system redirect to login Form, then he insert username and password than the system validate it , if ...
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1 vote
1 answer
793 views

Sequence diagram: explicitly show websocket creation?

I am trying to draw up a sequence diagram to show how my web client will interact with my backend over a websocket connection. I am using a websocket middleware to manage the stream connections. ...
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3 answers
904 views

Is this right way to create sequence diagram?

im trying to create a sequence diagram for login , but i dont know if its true or not , maybe the community can help me check , because i see many way to create sequence diagram and its not the same ...
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7 votes
1 answer
998 views

Why is a <<create>> message asynchronous in UML sequence diagrams?

As far I as I could tell, the proper way to show an object creation in a sequence diagram is with an asynchronous arrow, e.g., However, in Java (and other OO languages I have used), as far as I know, ...
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Object and actors in sequence diagram [duplicate]

question Can an actor "talk" directly with an object of the system in a sequence? example For an homework I need to model a "tracking service" for some shipping company. The functional requisites ...
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Handle alternative frame in sequence diagram

Question When an alt frame is used in a sequence diagram, and one of the two possibility end the sequence, how is "legal" to continue? example I need to represent a sequence in wich there ...
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-1 votes
3 answers
283 views

Coherence between sequence diagram and class diagram

Question 1 All participants in a sequence diagram must match a class in class diagram? Question 2 All class that represents some object that is created by the system needs a class that creates it? ...
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2 answers
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What's the use case of the combined fragment "strict"?

As far as I understood, synchronous messages will be handled one after another. Then we have the interaction operator for combined fragments called "strict" which states, that the operands inside the ...
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2 answers
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UML sequence diagram for a periodic operation

I have a scheduled operation in my spring boot application using spring boot scheduler. this operation executes every period of time(30 minutes) and adds data in the database if conditions are met. I ...
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1 vote
1 answer
252 views

Is the sequence diagram for the pull model for observer pattern the same as push model?

I've been looking at examples of sequence diagrams for observer pattern but most implement push model where the subject updates the observers. In a pull model how would it be different because ...
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1 answer
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C# variables in Sequence diagram

I am playing with sequence diagram. And main question is how to draw properly on sequence diagram interaction with variable. How to draw 1) When MakePayment aggregates person insurance....
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2 answers
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Is it possible to represent an if statement in a system sequence diagram?

I'd like to highlight that this questions is about a System Sequence Diagram (SSD) and not a simple Sequence Diagram and of course any help would be appreciated! I'm reading Graig Larman's book ...
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-5 votes
1 answer
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How this diagram can be improved [closed]

I'm looking for failures in this "token based login" design, besides the UML "syntax" errors. Theoretically speaking, it will do the trick when implemented on an small project. If true, sorry about ...
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1 vote
1 answer
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Trying to understand Sequence Diagram

I am trying to understand two sequence diagrams that I have found in the SE course at university of Washington. Can you confirm if my understanding is correct ? Diagram 1: According to my ...
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3 votes
0 answers
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Displaying entity framework calls in Sequence Diagram

I have a controller action which gets all the Plants by location from the database puts it inside a view model and passes it to the view. public ActionResult index() { List<Plant> plants = ...
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-1 votes
1 answer
845 views

Microservice dependency diagram

What is the best way to capture dependency between microservices. I want to create a diagram which show the interfaces and the microservices using the interfaces. The aim is to easily do a impact ...
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1 vote
3 answers
715 views

How to display a C# using() statement in sequence diagram

Is there a rule/guideline about how to display a C# using() statement in UML sequence diagrams? I'm right now in the last months of my apprenticeship. And to prove, that I'm able to develop software ...
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1 vote
1 answer
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Representing handlers on UML diagrams

This question is a follow-up to Representing multiple actions for sequence of objects on activity diagram, but isn't strictly related. The question boils down to: How to present in UML patterns that ...
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5 votes
1 answer
12k views

Shall the Database in a sequence diagram be represented as actor or boundary?

I'm designing a system made of a web application and database. I use the <<Entity>> - <<Control>> - <<Boundary>> stereotypes in my UML diagram. In the following ...
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3 votes
1 answer
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What is a good diagrammatic way to represent async event communication between two systems?

What is a good diagrammatic way to represent asynchronous event communication between two systems (the pub sub model)? I am not looking for tools but more of a representation. Is it a sequence diagram,...
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2 votes
2 answers
5k views

Sequence diagram for Abstract and Derived class

I've a bunch of classes where one is Abstract class. I draw few derived class from that Abstract base class. For example, class IBase{ public: *register(): bool* *update(): bool* }; class Derived:...
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2 votes
4 answers
1k views

Is actor a own class

I have this sequence diagram and want to transform it into a class diagram. But I don't know if the actor (Customer) is in this case a own class or not. Normally the actor isn't a own class, but in ...
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2 votes
2 answers
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Long chained method calls contained within an if statement shown on a sequence diagram

Just wondering if there is a good way to do this? Currently i'm performing the method calls as if they were happening prior to the conditional block, then comparing what would be the result in "[...
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5 votes
3 answers
2k views

Software architecture | App with API back-end

I have been searching the net for an answer, but I was not able to find a similair question nor answer. So here I am. I am developing an app where a user can take a picture of a car and they will get ...
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2 votes
1 answer
3k views

How do I represent a recursive process down a tree in a sequence diagramm?

I'm working on a sequence diagram for a layered system that has a tree hierarchy. Now I have a process that works itself recursively down the tree. Meaning calling the same function on a child object. ...
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3 votes
2 answers
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A function as a parameter in UML

I was wondering what is the best way to represent a function that is passed as a parameter in UML. Because I want to create a sequence diagram of my current networking code in my Swift project and ...
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3 votes
1 answer
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UML Sequence Diagram

I am trying to draw a sequence diagram for "post a job" use case. The description is as follow: Basic flow: This use case begins when the employer selects the “Post a new Job” option. System ...
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10 votes
3 answers
23k views

UML sequence diagram - how to represent async response

If A sends an async message to B like for example, to load async images to UI from the web. Where should the response message go? Should it be slant as well or direct? And where would the activation ...
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14 votes
1 answer
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Sequence Diagram: Are actors objects?

The most likely answer is no, but I've come with this doubt. Can an actor act as a class? I know actors trigger events and can have prompts, but if there's a class modeling an actor (such as an user ...
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2 votes
1 answer
3k views

How to show multiple exit conditions in a system sequence diagram loop frame

How are multiple exit conditions in a system sequence diagram loop frame indicated? And how would the alternative event flow based on how the system exited the loop be shown? For example a login loop ...
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2 votes
2 answers
883 views

Is it okay to simplify a Sequence Diagram (grouping lifelines)?

Is it okay to group several Components into a single lifeline for simplicity? For example, let's say I have a UML Component Diagram, and it's a layered architecture. There are 26 components, one on ...
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3 votes
2 answers
709 views

Sequence diagram - unknown receiver of a message

Our lecture provides us students a quiz to revise the material learnt of the last study session. The answer to the following questions was stated as "Yes": "The receiver of a message does not have ...
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4 votes
1 answer
7k views

Does a message in a UML sequence diagram have parameters or arguments? [duplicate]

I recently took an exam for the introductory course on Computer Science. One question was about sequence diagrams (very simple example, boiled down to its essentials): The Bank object sends a message ...
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2 votes
1 answer
3k views

Is there a way to show an if statement in a UML Sequence Diagram?

I went on an interview last year and was shown a sequence diagram and was asked to describe the the sequence. There were 2 things in the diagram I had never seen before. I asked what one of them was ...
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5 votes
2 answers
6k views

How to show retry in sequence diagram

I am drawing sequence diagram for large integration project where one system will initiate the REST call to another system and there is a proxy in middle which will pass through the request like A->...
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