Architecture

Introduction

Diagrams and short description of few Aida internals.

 

 

Figure: Aida/Web application

 

Figure: Aida application layers

 

Request path

 

Figure: Web request path

Ok, let we start with a web request path in an Aida app from tutorial, to the anAddressBook therefore:

1. Swazoo web server opens a connection and receives a request
2. it finds a proper AIDASite and calls its answerTo: metho user's session is found (from a cookie) or created
3. request is now routed to the right domain object for that URL domain object is asked for it's presenter
4. presenter is returned or created, an instance of AddressBookApp in our case,
5. presenter is asked to represent itself as a web page
6. a composite web page (like a DOM tree) is composed
7. streaming as HTML to the web response of web page is the last step.

To step through that sequence you can put a breakpoint in AidaSite>>answerTo: . then open object's URL. Some more intereting objects and methods to wach through that journey (Aida 6.5!):

AIDASite answerTo: aRequest

 WebSessionManager findOrCreateSessionFor: aRequest
 WebRouter resourceFor: aRequest
  URLResolver resourceFor: aRequest
   URLResolver objectOnUrl: url

  AIDASite answer: anObject to: aRequest on: aSession
   AIDASite answer: anObject toGetOrPost: aRequest on: aSession
    AddressBook(Object) aidaPresenterFor: aRequest on: aSession
     AddressBook(Object) aidaWebAppFor: aSession
      WebApplication newFor: anObject on: aSession

     AdressBookApp(WebApplication) composeWebPageFor: aRequest
      AdressBookApp(WebApplication) composeWebPageStepTwoFor: aRequest
       AdressBookApp(WebApplication) composeWebView:aViewSymbol for:aReq
    AddressBookApp class viewMethodForView: aViewSymbol
        AddressBookApp perform: method

    AIDASite addResponseHeadersTo: response forPage: presenter on:..
    AddressBookApp streamHtmlTo: aStream for: aRequest on: aSession
     WebPage streamHtmlTo: aStream for: aRequest on: aSession
      WebWindow streamHtmlTo: aStream for: aRequest on: aSession
        WebWidget streamHtmlTo: aStream for: aRequest on: aSession
          etc... recursively down to all composition

 

MVC in Aida

 

Figure: MVC implementation in Aida

 

Tree-like Control Flow

Figure: Graph and Tree-like control flow combined

 

Figure: Page composition possibilities

 

Figure: Web contexts and popup windows

 

Figure: Web Contexts for Tree-like Control Flow