#IF STATEMENT ON SEQUENCE DIAGRAMS CODE#

Now the user needs to start interacting with the other objects in the system by visiting the “Login page”.

#IF STATEMENT ON SEQUENCE DIAGRAMS CODE#

Just type the word “User” in the code field and Gleek will draw a rectangle with rounded edges to represent an object. Right, let’s put our sequence diagrams to good use and model a login page for a website! First, we need to head over to the Gleek.io app and select “sequence diagram” from the dropdown menu. Step-by-step guide to creating a login system sequence diagram In the sequence diagram, this is represented by an alt, or alternative, operator that creates a frame around part of the sequence showing the choice between accepting or rejecting the user login information. The database responds and the user is either allowed to enter the site or not. This page in turn sends those credentials to the database that stores user information. įrom the point of view of the sequence diagram, the user is the first active object and sends credentials to the login page. If not, you will usually get a response telling you to try again.Ĭheck out our latest how-to article on a Sequence diagram for Microservices using Gleek AI chat.

If everything is correct, you get cleared to enter the site. The server will then run some complicated algorithms to check whether you have submitted the correct password. You enter your data and submit the form, and this is when the sequence diagram kicks in and shows how useful it can be.Īssuming you have filled in both the username/email address and password, the server will first check that the username exists in the system. This is often just your email address and a password. Once the page has loaded, you’re usually presented with a form that allows you to enter your credentials, or in other words the information that you used to sign up for the site. So what actually happens when you arrive on the login page for your favorite website? That’s exactly what a sequence diagram is designed to show. Behind the scenes, any login page involves messages being sent back and forth, objects being activated, and responding with data, and it happens over a discrete period of time. How can you create a sequence diagram for a login system?Ī great example of sequence diagrams is a user login system. For much more detail, you should check out our sequence diagram page on Gleek. That gives you an overview of what to expect from a sequence diagram. The arrows are usually labeled so that you can easily understand the content of the message. Messages can be sent back and forth, from left to right, and the arrow shows which is the receiver and which the sender of the message.

These messages are represented by a line with an arrow. Each object can also have an activation bar on its lifeline that will show when it is active in the system and accepting or processing information from another object.Īctivity in the system is shown by messages that pass between the objects. These lifelines are shown by parallel vertical lines that can never overlap. Each object has a lifeline that represents its existence in time. The diagram shows the objects, or actors, involved in the system. Make your own UML sequence diagram with Gleek. The sequence diagram lets a developer sketch out and demonstrates how processes will behave and interact in sequence. What is a sequence diagram and what is it used for?Ī sequence diagram is a type of UML (Unified Modelling Language) diagram that is used to model interactions between objects in a system over time.

IF STATEMENT ON sequence diagrams