![]() ![]() A sequence diagram shows different processes or objects that live simultaneously (shown in parallel vertical lifelines), and the messages exchanged between them in the order in which they occur (shown as horizontal arrows). It describes the interaction between objects in the sequential order that these interactions occur. Use cases are often refined into one or more sequence diagrams.Įlements of a use case diagram Sequence diagramĪ sequence diagram is an interaction diagram. ![]() Package diagrams are useful when class diagrams that encompass the whole system become too large.Įlements of a package diagram Use case diagramĪ use case diagram is a dynamic behavior diagram that describes a set of actions (use cases) that some system or systems should or can perform in collaboration with one or more external users of the system (actors). A package diagram is just a class diagram that shows only packages and dependencies. It shows the packages of classes that make up the model, and the dependencies between the packages. It describes the static structure of a system by imaging the classes of the system, their attributes, operations (or methods) and the relationships between the classes.Įlements of a class diagram Package diagramĪ package diagram is a static structure diagram. Please someone correct me if there is any misunderstanding.A class diagram is a structural diagram. ![]() Finally, the cart object will invoke the placeItemInOrder function of the inventory object to place the checked out items in order. Next, the storefront will acknowledge this message, meaning that the order has been confirmed and then an acknowledgment will be sent by the cart order to acknowledge the checkout process. ![]() Next this "self function " will invoke the confirmOrder method of the storefront object. Next, this cart object will invoke its processorder function to process the order. After that ,the storefront object will send a message for the cart object to make the checkout of these items that are added to the cart from the for loop. Next, this inventory object will acknowledge the cart object and the cart object will acknowledge the storefront object for adding this item. For certain storefront ( object of storefront class, say amazon ), there will be a loop for each item or stock available at this storefront, every item will be added to a certain object of cart class and this cart object will call a certain inventory object to reserve this item (call reservethisitem method of that belongs to this object). I understand that this diagram describes the operation of buying some items from certain storefront. Else, if the value is less than 1000, the other distributor "regular" will dispatch this item. In other words, we will send a message or call the dispatch function of the careful object of the distributor class. After that for each item in this order (loop), for if the value of this item is more than 1000 we will make the careful distributor (certain object of distributor class) to dispatch this order. First of all, there will be a dispatch message for certain order (object of order class). Can you confirm if my understanding is correct ?Īccording to my understanding, this sequence diagram describes the dispatch process of orders to either of two distributors. I am trying to understand two sequence diagrams that I have found in the SE course at university of Washington. ![]()
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