Delphi MVC Framework. Mathias Pannier

Transcription

1 Delphi MVC Framework Mathias Pannier

2 Aboutme Name: Mathias Pannier Position: Software developer/ Team leader More than 15 years of experience with software development in Delphi Blog:

3 DMVCFramework Delphi MVC Framework -is a powerful framework for web solution in Delphi(Quelle: Source filesforthedevelopmentofweb services(rest Server/Clients) Website: Support site:

4 DMVCFramework Lead developer and initiator is Daniele Teti ( - Author of Delphi Cookbook) Delphi Cookbook contains some sections about DMVCFramework At themoment4 developer First public release 10/29/2013 Last update January 2016 (Time of presentation is January 2016) Works withxe3 andnewer

5 Features Simple to use (really) RESTful (RMM Level 3) compliant Fancy URL with parameter mappings** Specialized renders to generate text, html, json** Powerful mapper to map jsonto objects and datasets to objects** Can be packaged as stand alone server, apache module (XE6 or better) and ISAPI dll

6 Features Integrated RESTClient Messaging extension using STOMP Load balancing and cache using REDIS It use Embarcadero WebBrokerbut is not tied to it Designed with services and web client app in mind Server side generated pages using Mustache (in the past elua) Etc. Source: und N%202013%20-%20Introduction%20to%20DelphiMVCFramework.pdf

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8 REST... representational state transfer (REST) is the software architectural style... REST's coordinated set of constraints, applied to the design of components in a distributed hypermedia system, can lead to a higherperforming and more maintainable software architecture. Constraints: Client-server, Stateless, (HTTP) Cacheable, Uniform interface(uri, HTTP verbs, JSON, HATEOAS navigationbyuris), Layered system Source:

9 Architecture Oneapplication(EXE orisapi DLL) Several controller(tmvccontroller) Severalactionsper controller(methods) Controller, action and parameter are parts auf the url

10 1. Example- Delphi WebBroker Application(ISAPI/EXE) type TWebModule1 = class(twebmodule) procedure WebModuleCreate(Sender: TObject); private DMVC: TMVCEngine; end; proceduretwebmodule1.webmodulecreate(sender: TObject); begin DMVC := TMVCEngine.Create(self); DMVC.AddController(TBlogController); end;

11 1. Example The controller type [MVCPath('/blog')] TBlogController = class(tmvccontroller) public [MVCPath('/posts/($id)')] procedure GetPostByID(CTX: TWebContext); end; implementation procedure TBlogController.GetPostByID(CTX: TWebContext); var ablogpost: TBlogPost; begin ablogpost := LoadFromDataBaseByID(CTX.Request.Parameters['id'].ToInteger); Render(aBlogPost); end;

12 Parameter CTX.Request.Params['id'] URL Mapped parameters Query String parameters Form parameters(html Form Submit) Cookie fields Bsp.:

13 Renders Methods of the controller to produce the response stream Renders can set the HTTP Status Code and the Content Type Currently you can render Text, DataSets, JSONValues, Delphi Objects, List of Delphi Objects, Exceptions, HTML pages using Mustache, Raw Streams

14 Rendersexample procedure TBlogController.GetPostByID(CTX: TWebContext); var ablogpost: TBlogPost; begin ablogpost := TBlogPost.Create; ablogpost.id := CTX.Request.Parameters['id'].ToInteger; ablogpost.title := 'Hello World.'; ablogpost.body := 'This is a test message.'; ablogpost.createdate := Now(); ablogpost.author := 'Mathias Pannier'; Render(aBlogPost); end; procedure TBlogController.GetPostByID(CTX: TWebContext); begin DataSet1.SelectSQL.Add('select * from BLOG_POSTS where ID = :ID'); DataSet1.Params[0].AsInteger := CTX.Request.Parameters['id'].ToInteger; DataSet1.Open; Render(DataSet1); end;

15 Mapper Converter" for Delphi Objects, JSon and DataSets Example.: ObjectToJSONObject JSONObjectToObject DataSetToJSONArray JSONArrayToDataSet... Can be used independent of the DMVCFramework

16 Mapper example procedure TForm1.Button1Click(Sender: TObject); var ablogpost: TBlogPost; begin ablogpost := TBlogPost.Create; ablogpost.id := 1; ablogpost.title := 'Hello world.'; ablogpost.body := 'This is a test message.'; ablogpost.createdate := Now(); ablogpost.author := 'Mathias Pannier'; ShowMessage(Mapper.ObjectToJSONObjectString(aBlogPost)); ablogpost.free; end;

17 Demo

18 Alternatives Hand made with Indy components DataSnap(Embarcadero; shipped with Delphi) mormot Framework TMS XData kbmmw RemObjects Etc.

19 WhyDMVCFramework Lightweight, small, fast Easy touse Open source Closer to REST/Web development/http Mapper/Renders independently usable Performance andstabilityofdatasnap... (

20 Questions?