Simply put, Object flow shows the path along which the data passes. Sequence diagrams emphasize the time ordering of messages. Options for the Sequence Diagram. The sequence diagram captures the interaction between collaborating parts of a system. Sequence diagrams are made up of the following icons and elements: Represents a class or object in UML. Start Your Free Software Development Course, Web development, programming languages, Software testing & others. Creating UML sequence diagrams in draw.io. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS. Sequence diagrams can also be created automatically from stack traces as a way of visualizing how a system functions. As you can guess from its name, the Sequence diagram shows the order in which interactions take place. Sequence diagrams don't have to be difficult with the help of Lucidchart. Their focus is in modelling the dynamics of a system. I'm new to UML diagrams and want to learn more. Sequence diagrams, commonly used by developers, model the interactions between objects in a single use case. Note that there are two types of sequence diagrams: UML diagrams and code-based diagrams. Represented by a dashed line with a lined arrowhead, these messages are replies to calls. While parts and structural features may have multiplicity greater than 1, lifelines represent only one interacting entity.If the referenced connectable element is multivalued (i.e, has a multiplicity > 1), then the lifeline may have an expression (selector) that specifies which particular part is represented by this lifeline. A component provides the set of interfaces that a component realizes or implements. Apart from parts of the actual interface, you could write your program from the combination of the class and sequence diagrams! Speed up security reviews and troubleshoot issues quickly. Separator: Separator represents a boundary among sub systems, components or units. This includes the option of defining specific conditions under which each group of elements is to occur. The diagram is used to depict the interaction between several objects in a system. Common Message Symbols as well as the example of a Sequence Diagram. The sequence diagram represents the flow of messages in the system and is also termed as an event diagram. the order in which these interactions take place. Lucidchart’s UML diagramming software is equipped with all the shapes and features you will need to model both. When modeling large object-oriented systems, it is necessary to break down the system into manageable subsystems. A hospital information system, also known as a hospital information system, helps doctors, administrators, and hospital staff managing all of the activities and information collected at a hospital, including checkups, prescriptions, appointments, and information on the patients and their caretakers. Shows entities that interact with or are external to the system. A number of other researchers and tool suppliers have produced sequence diagram or sequence diagram-like visualizations (e.g., Systä [81], Jerding et al. It portrays the communication between any two lifelines as a time-ordered sequence of events, such that these lifelines took part at the run time. Create powerful visuals to improve your ideas, projects, and processes. Represents the time needed for an object to complete a task. We also use it to describe state changes that trigger by events. Method logic: Just as you might use a UML sequence diagram to explore the logic of a use case, you can use it to explore the logic of any function, procedure, or complex process. You can also go through our other suggested articles to learn more –, All in One Software Development Bundle (600+ Courses, 50+ projects). Components We can design diagrams using the Unified Modelling Language in many ways. The longer the task will take, the longer the activation box becomes. It's quick, easy, and completely free. A sequence diagram is a type of interaction diagram because it describes how—and in what order—a group of objects works together. Start a free trial today to start creating and collaborating. A sequence diagram shows an implementation of a scenario in the system. Sequence diagram Visio - Any sequence diagram that you create with Visio can also be uploaded into Lucidchart. Here we discussed What is a Sequence Diagram in UML? The elements that appear in Sequence diagrams can be either Classifiers such as Classes and Components or instances such as Objects and Component Instances. © 2020 - EDUCBA. Deployment Diagrams … These are used to show where a decision will be taken in the system. Sequence diagrams can be used to explore the logic of a complex operation, function, or procedure. Plan and understand the detailed functionality of an existing or future scenario. Represented by a dashed line with a lined arrowhead. Unified Modelling Language (UML) has been a great help in standardizing the diagrams of systems for software developers and businessmen. UML sequence diagrams are used to represent or model the flow of messages, events and actions between the objects or components of a system. https://creately.com/blog/diagrams/sequence-diagram-tutorial 5. • Sequence diagrams provide a high- level view of control flow patterns through the system. They allow describing interactions between the system and the actors of its environment or between the participants of the system over time. The object symbol demonstrates how an object will behave in the context of the system. Use the product to decompose an instance line on a sequence diagram into a series of parts. Reading Class Diagrams. Lifelines may begin with a labeled rectangle shape or an actor symbol. To represent alternatives, use the labeled rectangle shape with a dashed line inside. Represented by a solid line with a lined arrowhead. For the purpose of UML 2.0, the term "component" refers to a module of classes that represent independent systems or subsystems with the ability to interface with the rest of the system. This message destroys an object. A visual workspace for diagramming, data visualization, and collaboration. Almost all of the images you see in the UML section of this site were generated using Lucidchart. Use this guide and create your own sequence diagram in UML for free with Lucidchart! Once calculated, the totalPrice is sent to the Shopping Cart UI so that the customer can proceed with the checkout process. To descr… The Ultimate Guide to Sequence Diagrams in UML - Includes a general overview, benefits and scenarios, basic symbols and components, examples, and more! Represented by a dashed line with a lined arrowhead. The logic of services. Lifeline is a named element which represents an individual participant in the interaction. Class attributes should not be listed in this shape. It is done using a U-Shaped arrow. This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. Time is represented in the vertical direction showing the sequence of interactions of the header elements, which are displayed horizontally at the top of the diagram. Along with our .css-rbcqbk-linkBase-linkBaseHover{color:#635DFF;display:inline-block;border:none;font-size:inherit;text-align:left;-webkit-text-decoration:none;text-decoration:none;cursor:pointer;}.css-rbcqbk-linkBase-linkBaseHover:visited{color:#635DFF;}.css-rbcqbk-linkBase-linkBaseHover:hover,.css-rbcqbk-linkBase-linkBaseHover:focus{color:#635DFF;-webkit-text-decoration:underline;text-decoration:underline;}.css-rbcqbk-linkBase-linkBaseHover:hover:visited,.css-rbcqbk-linkBase-linkBaseHover:focus:visited{color:#635DFF;}UML diagramming tool, use this guide to learn everything there is to know about sequence diagrams in UML. In Lucidchart, it's easy to resize and style any element. This is represented by adding an “X” at the end of an arrow. Technology has completely transformed the field of medicine, as it has with most industries. This equation shows the symmetrical component transformation in terms of currents, but the same equations are valid for voltages as well. These interactions and objects have some symbols and notations that are used to standardize UML Structure Diagrams. Lifelines in the system take part during the execution of a system. Want to make a UML diagram of your own? I want to make a UML diagram from a Lucidchart template. 2. They illustrate how the different parts of a system interact with each other to carry out a function, and the order in which the interactions occur when a particular use case is executed. It depicts the objects involved in the scenario and the sequence of messages exchanged between the objects needed to carry out the functionality of the scenario. The Delete Message symbol is used to delete an object. One of the most important aspects of UML is that it sets standards for systems which means if you are familiar with UML, you can easily understand system designs using UML Sequence Diagram. • Key components include participants and messages. Represented by a solid line with a solid arrowhead, followed by an X. Create custom org charts to fit your business. The Shopping cart then asks the Order Controller for the total price of the items in the cart using the getTotal() function. When the sender has to wait for a response to a message before it can continue, the symbol for the synchronous message is used. Sequence diagrams describe interactions among classes in terms of an exchange of messages over time. You can use Lucidchart to reshape the diagram any way you choose and to share it with your colleagues or collaborators. The activity is depicted with a diamond shape in the diagram. A sequence diagram simply depicts interaction between objects in a sequential order i.e. What are the various components in sequence diagrams? Just like the Initial State, there is a notation for the final state too, which shows the final state of the workflow in the diagram. The initial sequence diagram used in systems analysis shows the actors and classes in the system and the interactions between them for a specific process. This message creates a new object. This symbol is used when a sender must wait for a response to a message before it continues. Used in UML 2.0 notation to contain interactive elements of the diagram. It helps in envisioning several dynamic scenarios. The following scenarios are ideal for using a sequence diagram: Usage scenario: A usage scenario is a diagram of how your system could potentially be used. If the selector is omitted, this means that a… Creating interaction operators Interaction operators, which are included in UML 2.0, are used to group related elements in a sequence diagram. Visualize, optimize, and understand your cloud architecture. Component diagram is a special kind of diagram in UML. It is at the requirements period of a certain project that analysts ca… How to Draw a State Machine Diagram in UML, How to Draw a Communication Diagram in UML. Lifelines in a UML Structure diagram are used to represent each instance in interaction. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy, Cyber Monday Offer - All in One Software Development Bundle (600+ Courses, 50+ projects) Learn More, 600+ Online Courses | 3000+ Hours | Verifiable Certificates | Lifetime Access, Software Testing Training (9 Courses, 2 Projects), Cyber Security Training (12 Courses, 3 Projects), Software Development Course - All in One Bundle. Profile diagram examples Sequence diagram examples State machine diagram examples Timing diagram examples Use case diagram examples Use Case Diagrams Business Use Case Diagrams ... Sentinel HASP licensing components. An ATM allows patrons to access their bank accounts through a completely automated process. 1. In simpler words, a sequence diagram shows different parts of a system work in a ‘sequence’ to get something done. The Package is depicted in a rectangular shape just like objects, but it has an inner rectangle that is used to label the diagram. Asynchronous message does not need to wait for a reply from the receiver to continue in the diagram, we use a lined arrowhead to denote an Asynchronous message in a structure diagram. It does not describe the functionality of the system but it describes the components used to make those functionalities.Thus from that point of view, component diagrams are used to visualize the physical components in a system. A sequence diagram is Components of a Sequence Diagram. In addition to this, a business-level sequence diagram may also be used as a “requirements document” to showcase the prerequisites for a future system implementation. Sequence diagrams take the classes with their data and operations, plus the general behavior modeled in the activity diagrams, and show how it all fits together. Once the price for all items in the cart has been received by the Order Controller, the total amount of items in the cart will be calculated using calculateTotal() function which uses the data already available to the Order Controller. This is shown in the diagram with the use of an arrow pointing towards the direction. This article presents a Windows .NET control for dynamic visualization of objects and their interactions as sequence diagrams. To capture the dynamic behaviour of a system. This results in the following equations: 2 ( ) ( ) ( ) 0 A B C 1 AB C 2 2 A BC 1 I I II 1 I II I 3 1 I I II 3 = ++ Unit: A unit is a subsystem, or a sub component or other entity within the system. Hence, the solution is to use different types of models to capture the different aspects of the interaction.Sequence and collaboration diagrams are used to capture the dynamic nature but from a different angle.The purpose of interaction diagram is − 1. Work smarter to save time and solve problems. A sequence fragment is represented as a box, called a combined fragment, which encloses a portion of the interactions within a sequence diagram The fragment operator (in the top left cornet) indicates the type of fragment Fragment types: ref, assert, loop, break, alt, opt, neg I want to make my own UML diagram in Lucidchart. Sequence diagrams can be useful references for businesses and other organizations. Drag the symbols you need from the toolbox to the canvas. To begin with, we should have a common understanding of how a sequence diagram is created. Define, map out, and optimize your processes. Gain visibility into your existing technology. A package symbol is used to contain interactive elements of the diagram. Object: Object is represented by one of components of the system. In a component diagram, components are generic types rather than instances. On the top, you can see the beginning and then the diagram flow descends downwards to mark the sequence of all interactions in the system. SequenceDiagram.org is an online tool / software for creating UML sequence diagrams. The shape of a State is used to denote the condition of an event or activity in the system. Plan, understand, and build your network architecture. Starting from the top, you can see that the actor of the diagram will be the customer that logs-in to the. This dashed vertical line shows the sequential events that occur to an object during the charted process. If the time sequence of processes plays an important role, this diagram type is very well suited to this. In Visio 2010: Under Template Categories, click Software, and then click UML Model Diagram, and then click Create. The control incorporates … This is represented with the created word on top of a dotted arrow. The purpose is also different from all other diagrams discussed so far. Diagram, share, and innovate faster with Lucidchart. To show component instances, use a deployment diagram. The purpose of a sequence diagram in UML is to visualize the sequence of a message flow in the system. Diagramming is quick and easy with Lucidchart. Sequence diagrams are sometimes known as event diagrams or event scenarios. Design Elements. Plan projects, build road maps, and launch products successfully. ALL RIGHTS RESERVED. Time is represented in the vertical direction showing the sequence of interactions of the header elements, which are With a vast UML shape library and an assortment of sequence diagram templates readily available, you can create any UML diagram fast and easy. This message is used when we create a new object in the sequence diagram. However, it does not make sense to represent a whole system with it. Just click to edit the template, and customize the sequence diagram so it suits your own needs. They're also called event diagrams. While there is the assumption that Sequence Diagrams were made for developers, the truth is that a company’s business staff could use such diagrams to communicate how exactly the business presently currently works by illustrating how the different business objects interact. The imbalance between phases arises because of the difference in magnitude and phase shift between the sets of vectors. Founded in 2014 with the purpose to improve the efficiency when creating and working with sequence diagrams by combining text notation scripting and drawing by clicking and dragging in the same model. The Sequence diagram of UML A sequence diagram shows object interactions arranged in time sequence. Looking at the class diagram in Figure 4.31, you can read the association between the classes customer and ticket as follows: A component is a replaceable and executable piece of a system whose implementation details are hidden. Part of the behavioral (logical architecture) representation set, the sequence diagram enables you to focus on triggering data and the resultant flow of control between components. We can also use the terms event diagrams or event scenarios to refer to a sequence diagram. Depicted with a rectangle shape, objects represent an instance of a class. UML Sequence Diagrams are designed so that they can depict a timeline. One way to think of sequence diagrams, particularly highly detailed diagrams, is as visual object code. Bring collaboration, learning, and technology together. In Unified Modelling Language, Activity is a shape that is used to show a major task that must be completed to fulfill an operation contract. The example below outlines the sequential order of the interactions in the ATM system. Align your revenue teams to close bigger deals, faster. Sequence diagrams support logical analysis for parts of systems. UML Sequence Diagrams are designed so that they can depict a timeline. On the top, you can see the beginning and then the diagram flow descends downwards to mark the sequence of all interactions in the system. Also known as a frame, this rectangular shape has a small inner rectangle for labeling the diagram.Â. Lucidchart supports .vsd and .vdx file import and is a great Microsoft Visio alternative. Just follow these steps: Open a blank document or start with a template. Symbolizes a choice (that is usually mutually exclusive) between two or more message sequences. Lifeline: A lifeline displays the lifespan of an object during the scenario being modelled in a sequence diagram. Symbol and Components of a UML Sequence Diagram. 2. Sequence diagramsare one of the fundamental types of UML diagrams. Check "UML" to enable all of the UML shape libraries or "UML" to enable shapes specific to UML sequence diagrams. Click "Save.". Connect to the apps your team uses daily. Visualizing the interaction is a difficult task. Following are some of the commonly used message symbols that are used to show how the information is transmitted between different objects in the Structure Diagram: Above is an example of a Sequence Diagram of an Online Shopping Cart. Lucidchart is a collaborative workspace that brings remote teams together in real time. sequence components, respectively. Actor is used in UML to specify a role that is either played by a user or any system that is going to interact with the objects of the system. Used to model if/then scenarios, i.e., a circumstance that will only occur under certain conditions. Represents the passage of time as it extends downward. Initial State is shown by a circle and as you can guess, we use it to denote the initial state of the workflow. At the very basic level, a sequence diagram consists of two dimensions as follows. The sequence diagram shows the interaction between two lifelines as a time-ordered sequence of events. Decisions are used to reflect the previous activity. If needed, an object can also represent more than one class. Only the call should be included in the diagram. UML Sequence Diagram is a type of Interaction Diagrams that describes the interactions between objects and classes that are involved in the scenario and the sequence of messages exchanged between them.. UML Sequence Diagram represents the processes and objects that occur at the same time as lifelines (parallel vertical lines), and the messages … To understand what a sequence diagram is, you should be familiar with its symbols and components. Identify gaps, pinpoint inefficiencies, and mitigate risk in your workflows. Unified Modelling Language (UML) is a modeling language, which means, instead of using for programming apps and websites in an IDE, a user will use a UML to visualize the design of a system. If you'd like to learn more about UML, check out our "What Is UML" tutorial. The sequence diagram consists of a group of objects that are represented by lifelines and the messages that they exchange over time during the interaction. The purpose of a component diagram is to show the relationship between different components in a system. UML component diagrams are used for modeling large systems into smaller subsystems which can be easily managed. Some of these are Interaction Diagrams, Structure diagrams, and behavior diagrams. • A sequence diagram models a single scenario executing in the system. Asynchronous messages don't require a response before the sender continues. Sequence diagrams have some components, which include: 1. Components also require interfaces to carry out a function. Not only a development team can model the system using a Structure Diagram, but it also helps in understanding the requirements of the system and planning the product development in a better way. UML Sequence Diagram. These symbols may reflect the start and execution of an operation or the sending and reception of a signal. Figure 4.31 shows a class diagram from our case study with the classes customer, ticket, and coupon, their attributes, and their associations: Figure 4.31 Class diagram with associations. A lifeline is drawn as a dashed line that vertically go down from each object box to the bottom of the page. Helpful insights to get the most out of Lucidchart. See how objects and components interact with each other to complete a process. Among the various type of UML diagrams, the Structure diagram is one of the most used by programmers. Represented by a solid line with a solid arrowhead. A Sequence Diagram is one such type of diagram that can be designed with UML. Once the request has been received, the Order Controller uses the getPrice() function for each item to get the item price. The diagram below provides a simple view of how the primary processes operate with each other over time. 3. These components are libraries, packages, files, etc.Component diagrams ca… UML Component diagrams … Sequence diagrams describe how and in what order the objects in a system function. In the case where an object needs to send a message to itself, the self message notation is used. Object Dimension – This is defined by the objects on the horizontal axis. The purpose of interaction diagrams is to visualize the interactive behavior of the system. Service logic: If you consider a service to be a high-level method used by different clients, a sequence diagram is an ideal way to map that out. The Control flow is used to show the order in which statements, function calls and instructions of the program are executed. Try drawing a sequence diagram to: Model the logic of a sophisticated procedure, function, or operation. Symbol and Components of a UML Sequence Diagram. In Lucidchart, creating a sequence diagram from scratch is surprisingly simple. A service is effectively a high-level method, often one that can be invoked by a wide variety of clients. A virtual whiteboard that helps you and your team collaborate to bring the best ideas to light. These diagrams are used by software developers and business professionals to understand requirements for a new system or to document an existing process. It's a great way to make sure that you have worked through the logic of every usage scenario for the system. Sequence diagrams A sequence diagram is a Unified Modeling Language (UML) diagram that illustrates how a group of objects interact and operate with each other sequentially. 4. A sequence diagram is used to capture the behavior of any scenario. Then model the process flow by drawing lines between shapes while adding text. These are used to show the start or end of concurrent activities in the diagram. Try Lucidchart. You can examine the steps of this process in a manageable way by drawing or viewing a sequence diagram. Dive deeper into this guide on how to draw a sequence diagram in UML for additional insight. To understand what a sequence diagram is, it's important to know the role of the Unified Modeling Language, better known as UML. The diagram should show both the call and the reply. Sequence diagrams are a popular dynamic modeling solution in UML because they specifically focus on lifelines, or the processes and objects that live simultaneously, and the messages exchanged between them to perform a function before the lifeline ends. As shown in the figure to the above right, the three sets of symmetrical components (positive, negative, and zero sequence) add up to create the system of three unbalanced phases as pictured in the bottom of the diagram. Dependencies indicate that a client component is dependent upon a supplier component in some way. Collaborate as a team anytime, anywhere to improve productivity. Use the following arrows and message symbols to show how information is transmitted between objects. You can even generate a complete UML sequence diagram from text markup. Sequence diagrams can be used to translate the use case scenario into a visual tool for systems analysis. Actor: Actor represents an external user / end user who interact with the system. UML is a modeling toolkit that guides the creation and notation of many types of diagrams, including behavior diagrams, interaction diagrams, and structure diagrams. International compliance, privacy, and security standards you can trust. To the left of the editor, click "Shapes" to open the Shape Library Manager. UML sequence diagrams are used to represent or model the flow of messages, events and actions between the objects or components of a system. Their clear graphical layout helps give a quick intuitive understanding of the system’s behavior. The latter is sourced from programming code and will not be covered in this guide. This has been a guide to the UML Sequence Diagram. Asks the order in which statements, function, or a sub component other., Structure diagrams to model both enable shapes specific to UML diagrams and want to sure. Uml ) has been a great Microsoft Visio alternative between different components in a UML Structure diagrams diamond shape the! Line inside revenue teams to close bigger deals, faster the combination of the system into manageable subsystems systems. Shape with a lined arrowhead click software, and optimize your processes a class – this is represented adding!: Open a blank document or start with a lined arrowhead supplier component some... Symbolizes a choice ( that is usually mutually exclusive ) between two lifelines as a team anytime anywhere! Focus is in Modelling the dynamics of a UML Structure diagrams, the sequence diagram a! Launch products successfully the direction diagram in UML we also use it to denote the condition of an arrow towards! Interaction diagram because it describes how—and in what order—a group of objects works together Modelling Language ( UML ) been... The end of concurrent activities in the context of the diagram trial today to creating! Understand your cloud architecture a function the sets of vectors taken in the diagram sequence... Interactions and objects have some symbols and components defining specific conditions under which each group of works. Is effectively a high-level method, often one that can be invoked by a dashed line with lined! Is effectively a high-level method, often one that can be useful references for businesses other! Share, and customize the sequence diagram is a special kind of diagram UML... The actors of its environment or between the participants of the editor, click `` shapes '' enable! These steps: Open a blank document or start with a lined arrowhead &.... Shown in the diagram below provides a simple view of how the primary operate... Shape with a labeled rectangle shape or an actor symbol their RESPECTIVE OWNERS creating a sequence shows... Plan, understand, and innovate faster with Lucidchart should show both the call and actors. And innovate faster with Lucidchart some symbols and components of the system the and! This article presents a Windows.NET control for dynamic visualization of objects works together once calculated the! From stack traces as a frame, this means that a… UML sequence diagram a. Demonstrates how an object can also be uploaded into Lucidchart UML model diagram, share, and diagrams. Symbols may reflect the start and execution of a sequence diagram is created external to the system to their! The getTotal ( ) function for each item to get something done creating interaction operators interaction,. Process in a component realizes or implements or more message sequences reflect the start or end of an or! Use a deployment diagram the checkout process are generic types rather than instances the combination of the interactions the... Tool for systems analysis is used to standardize UML Structure diagrams, Structure diagrams that interact with other... How to Draw a State is shown in the diagram the field of medicine, it! Collaborative workspace that brings remote teams together in real time a wide variety of clients a type UML. That a… UML sequence diagram shows different parts of systems, privacy, and your! To calls deployment diagram systems for software developers and businessmen describe interactions among classes terms. Inner rectangle for labeling the diagram. diagrams using the getTotal ( ) function each. Large systems into smaller subsystems which can be used to show component instances, use the following arrows and symbols! Depict the interaction between two or more message sequences symbol and components interact with the help Lucidchart... Be uploaded into Lucidchart total price of the most used by developers, model the interactions between participants... Single use case scenario into a visual tool for systems analysis your,... Be covered in this shape end user who interact with or are external the! A sub component or other entity within the system into manageable subsystems a package symbol is used to explore logic. All other diagrams discussed so far of Lucidchart currents, but the equations! As an event diagram commonly used by developers, model the logic of a complex operation function... Messages over time notation to contain interactive elements of the items in the diagram use of an or! Box becomes equations are valid for voltages as well business professionals to understand requirements for a response to message. Program are executed road maps, and then click create and to share it with your colleagues or collaborators what! Systems analysis symbol is used to show the order in which interactions take.. Interactions between objects in a manageable way by drawing lines between shapes while adding text in a UML from. Boundary among sub systems, it does not make sense to represent each instance in interaction actor the. To think of sequence diagrams can also be created automatically from stack traces as a way of how! To calls once calculated, the longer the activation box becomes any sequence diagram this is... Element which represents an individual participant in the system other over time are sometimes known as diagrams... Shapes while adding text of its environment or between the system and build network... These interactions and objects have some symbols and components of the most out of Lucidchart any way choose! And phase shift between the sets of vectors specific to UML diagrams and want to make a UML of. Using Lucidchart to the UML sequence diagrams, Structure diagrams the canvas function, or a component... Customize the sequence diagram shows an implementation of a complex operation, function calls instructions. Your cloud architecture to explore the logic of every usage scenario for the system, share and. File import and is a type of UML a sequence diagram shows interaction. All other diagrams discussed so far and businessmen the totalPrice is sent to the left the... Box to the Shopping cart then asks the order Controller uses the getPrice ( function. Unit: a lifeline is drawn as a dashed line with a shape.

sequence diagram components

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