Application
- Set of computer programs that automates some business tasks
Three Common App’s Dimensions
- Characteristic: Data, constrains, and interfaces
- Responsiveness: Real-Time vs. Online vs. Offline
- Type: Business orientation (Transactional, Query, Decision, Intelligent, etc.)
Characteristic
- Any app have the following requirements for:
- Data:
- Input
- Output
- Storage
- Retrieval
- Transformation constrained by the business rules
- UI and Human Interfaces
Data
- Data are the raw material (numbers and letters) that relate to each other to form fields (attributes), which define entities. An entity is some definable class of people, concrete things, concepts, or events about which an application must maintain data.
- Data and entities can be described independently of their processing rules.
Data Processing
- Series of instructions run on data on some events
- The result of processing includes data modification OR read
Constraints
- Limitations of the behavior and/or processing of entities
- Types of constrains:
- Prerequisites: if-else statements before the processing
- Post-requisites: if-else statements after the completion of processing
- Time:
- Time of process: e.g. when to sync app data
- Timeouts: e.g.req/res. HTTP timeouts
- External time reqs.: time of results delivery
- Synchronous processing: running sequence of processing as transactions
- Response time for ext. interfaces: how much the app is responsive
- Structural: like app settings
- Control