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CH1 - Coggle Diagram

- - - - Must be attractive
  - - - for revenue generation is more effective if the applications are used for
        relatively long periods of time.
  - - - usually applied for business and financial apps such as mobile wallets
  - - - probability of users buying such an app increases if it provides
        outstanding features or usability, or when competing applications are not available
  - - - developed for
        internal use within the organization and provide an interface to the services provided
- - - - four main ways to create Browser-Based Apps
        
        Mobile Specific versions of websites and Apps(m.)
        when a mobile browser addresses the application, a mobile version of the application is provided. (m.facebook.com)
        
        Responsive web app
        ensure that the design adjusts to the form factor and screen size,
        usually expressed as view ports
        (The same view is kept for all screen sizes)
        
        Adaptive web apps
        predefined sizes
        There are different
        designs for these sizes and the features available to the user are often adjustable.
        
        Progressive web apps
        allow shortcuts of specific web pages to be created on the mobile
        home screen
        Appear like native apps and sometimes even can work offline.
      - -created using common web technologies
        -not be as feature-rich
        as native or hybrid apps
        -access to mobile sensors is also limited.
- - - - Thin
        
        -Do NOT contain App Code
        
        customized to the device and make minimal
        use of mobile operating system features
        -Use the web browser as the front-end
        and JS for implementing client-side logic
      - Fat
        
        May have multiple layers of application code and may use mobile
        operating system features
        
        Native or Hybrid applications
    - - Continues Mode -> data gets transferred as soon as it is submitted
      - Store-and-forward -> data may be stored locally before being transferred,
        especially when no connectivity is available
      - Data Transfer Approaches
        
        Synchronous
        
        performed when the calling function waits for the called
        function to complete before returning
        
        Asynchronous
        
        performed when the called server function returns immediately, processes the data in the background and calls back the calling client function once it completes the task
    - - Single-tier
        
        monolithic and have all servers on the same machine
        
        less scalable and harder to secure
      - Multi-tier
        
        spread server-side components across various units
        
        2 Tier -> separated web & DB Servers
        
        3 Tier -> Web + DB + App Server
        
        Multi-Tier Allows separation of responsibilities, provide database specialization ,better flexibility, scalability
        and security.
    - - WI-FI- 3,4,5G
        
        Three Methods
        
        Never-connected apps
        
        Work Offline, NO need to be connected (Calculator)
        
        Always-connected
        
        require a permanent network connection
        
        All mobile web applications fall into this category
        
        Partially-connected
        
        require a connection for tasks such as data transfer
        
        can
        operate for long periods of time without connection