ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF, REST, ODATA Radu Nicolescu Department of Computer Science University of Auckland 19 Sept 2018 1 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 2 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Outline 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 3 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Imperative vs Declarative • Imperative programming: HOW to do (usually low-level, state changes, loops) • Declarative programming: WHAT to do (usually high-level, no state changes, no loops) • Functional Programming (pure) • Logic Programming (pure) • Attributes - Aspect-Oriented Programming (AOP) 4 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Imperative vs Declarative • Imperative programming: HOW to do (usually low-level, state changes, loops) • Declarative programming: WHAT to do (usually high-level, no state changes, no loops) • Functional Programming (pure) • Logic Programming (pure) • Attributes - Aspect-Oriented Programming (AOP) 4 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Outline 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 5 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R OData { Open Data Protocol • Open protocol which allows the creation and consumption of queryable and interoperable RESTful APIs in a simple and standard way. • https://en.wikipedia.org/wiki/Open_Data_Protocol • https://www.odata.org/ • OData exposes data as resources that are addressable by URIs. • Representational state transfer (REST): Data is accessed and changed by using standard HTTP verbs of GET, PUT, POST, and DELETE. 6 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Outline 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 7 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF { Windows Communication Foundation • WCF is a runtime and a set of APIs in the .NET Framework for building connected, service-oriented applications. • WCF Data Services is a component of the .NET Framework that enables you to create services that use OData to expose and consume data over the Web or intranet by using the semantics of REST. • Uses the entity-relationship conventions of the Entity Data Model to expose resources as sets of entities that are related by associations. 8 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF { Windows Communication Foundation • WCF is a runtime and a set of APIs in the .NET Framework for building connected, service-oriented applications. • WCF Data Services is a component of the .NET Framework that enables you to create services that use OData to expose and consume data over the Web or intranet by using the semantics of REST. • Uses the entity-relationship conventions of the Entity Data Model to expose resources as sets of entities that are related by associations. 8 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF Data Services • EDM is high-level generic data model • Conceptual model • Storage model • Mapping between conceptual and storage models • Data sources • SQL databases via Entity Framework (EF) • Other data sources via ”Reflection” (simulating an SQL database) { A#4R • Custom 9 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF Data Services • EDM is high-level generic data model • Conceptual model • Storage model • Mapping between conceptual and storage models • Data sources • SQL databases via Entity Framework (EF) • Other data sources via ”Reflection” (simulating an SQL database) { A#4R • Custom 9 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF Clients • WcfClient.exe • CURL (Client URL, aka See URL) { XCOPY • Browser extensions: YARC (Chrome), RESTclient (FF) • C#, F#, JS • using URLs • using LINQ ) URLs 10 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF Clients • WcfClient.exe • CURL (Client URL, aka See URL) { XCOPY • Browser extensions: YARC (Chrome), RESTclient (FF) • C#, F#, JS • using URLs • using LINQ ) URLs 10 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Outline 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 11 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Simple Node Service 1 const http = require('http '); 2 3 const hostname = '127.0.0.1'; 4 const p o r t = 3000; 5 6 const server = http.createServer((req, res) => f 7 res.statusCode = 200; 8 res.setHeader('Content−Type', 'text/plain '); 9 r e s . end ('Hello Worldnn ' ) ; 10 g ); 11 12 server.listen(port, hostname, () => f 13 console.log(`Server running at ...`); 14 g ); 12 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Simple Node Service { Express 1 var express = require('express ') 2 var app = express() 3 4 app . get ('/', function ( req , r e s ) f 5 console.log("GET /") 6 res.send('Hello World') 7 g) 8 9 app . get ("/url", (req, res, next) => f 10 console.log("GET /url") 11 res.json(["James","Mano","Radu","Xinfeng"]); 12 g ); 13 14 app . l i s t e n (8085) 13 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Node Service { Varia • Advanced routing • Parsing URL • Dynamic content and data • Multi-threading { background • async, await • Odata? • ... 14 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Node Service { Varia • Advanced routing • Parsing URL • Dynamic content and data • Multi-threading { background • async, await • Odata? • ... 14 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Outline 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 15 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF Ddemos • Automatic parsing and translation URL ) method calls • Instancing models: single, multiple • Threading models: single, multiple • Demo: WCF Hello World • Demo: WCF Ping Pong 16 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Outline 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 17 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF Demos • Demo: Data Service EF { NO manual code! • Demo: A#4R Demo { ”reflection”, i.e. simulation of an EF model based on XML 18 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R Outline 1 Imperative vs Declarative 2 Open Data Protocol 3 Windows Communication Foundation 4 Node service 5 WCF Demos 6 WCF Data Service Demos 7 WCF A#4R 19 / 20 ImpDec OData WCF Node WCFDemo WCFDataDemo A#4R WCF A#4R • Extension of the given demos • Bigger, more realistic data • null XML Entries 1 <X> </X> 2 <X/> 3 <!−− <X> ... </X> −−> • Testing by script • Testing tools • DO NOT change anything but the .cs/fs source! 20 / 20.