Logical Application System Example
A logical application system is an assembly of other logical application systems, logical applications and end users interacting with application components to implement one or several functions.
A logical application is a component of an application that is available to the end user of this application in the context of his/her work. Logical applications represent the split of an application into its basic functional units. A logical application is a consistent, indivisible unit of processing that coordinates a set of messages and events in order to perform a task in the information system. In the application system, the logical application is the most basic functional unit.
Logical application system environment diagram
A logical application system environment presents a logical application system use context. It describes the interactions between the logical application system and its external partners, which allows it to fulfill its mission and ensure the expected functionalities.
The components of a logical application system environment are presented in an application system environment diagram that describes the interactions between the internal logical application systems, the users and the partner logical application systems.
The following diagram describes the logical application system environment corresponding to Internet purchases.
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Environment diagram if the logical application system "Internet Purchasing"
Purchases are offered to private users and companies.
The "Internet Purchasing" application system uses a "Purchasing Financing" logical application system that is external to the described environment.
The diagram includes:
• An application system component element that represents the application system internal to the environment.
A logical application service component represents the fact that the logical application system used plays a role in the described environment.
• A partner logical system that represents a logical application system used in the context of the described environment.
A partner logical system is a logical application system external to the environment of the described logical application system. The partner logical system can be a service supplier or a service consumer with respect to components of the logical application system.
• Two system user components that represent the user category of services provided by the environment.
A system user represents an organizational unit interacting with the boundaries of an application system environment or a logical application system environment.
• Interactions between the components representing requests for services.
An interaction represents a contract established in a specific context between autonomous entities that are internal or external to an enterprise. These entities can be enterprise org-units, applications, activities or processes, as well as external org-units. The content of this contract is described by an exchange contract.
Logical application system structure diagram
The components of the logical application system are described in an application system structure diagram, which presents:
• services offered or required
• processes handled, components and interactions
• end users interacting with the application components
The following diagram describes the structure of the Internet purchasing logical application system proposed to customers.
"Internet Purchasing" logical application system structure diagram
Requests made by customers are processed by a "Management Shopping Cart" logical application system. The "Order Creation" logical application is then used in the context of this architecture.
The logical application system structure diagram, responsible for customer shopping cart management, presents two request points for "Booking" or "Ordering".
"Management Shopping Cart" logical application system structure diagram
These diagrams include:
• A component of end user type in this case representing customers.
The end user represents an organizational unit interacting at the boundaries of an application system or a logical application system.
• Two logical application system components that represent the logical application systems used.
The use of a logical application system describes the role of a logical application system in a composition relationship with a parent application system or in a logical application system environment.
• Tee logical application components representing the logical applications used in the context of the described logical application system.
A logical application component describes the role of a logical application in a composition relationship with a parent logical application or a logical application system.
• Interactions between the components representing requests for services.
An interaction represents a contract established in a specific context between autonomous entities that are internal or external to an enterprise. These entities can be enterprise org-units, applications, activities or processes, as well as external org-units. The content of this contract is described by an exchange contract.
