VEEBIRAKENDUSTE ARHITEKTUUR Tehniline vaade
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1 VEEBIRAKENDUSTE ARHITEKTUUR Tehniline vaade
2
3 KOGEMUS ZeroTurnaround - java engineer Developer tools, used by thousands Proekspert - tarkvaraarhitekt EMT & Elisa backend Danske Bank kaardimaksed
4 LOENGU KAVA 1. Veelkord arhitektuurist 2. Veebirakenduste arhitektuur 3. Veebirakendused javas 4. Live coding (kui aega jääb)
5 ARHITEKTUURI POINT HALDAB KEERUKUST MÕELDUD INIMESTELE
6 EMT BACKEND 4 miljonit rida koodi kirjutatud 15 aasta jooksul 10 tarkvarafirma poolt 20 andmebaasi 1000 tabelit andmebaasis
7 UNIVERSAALSED PÕHIMÕTTED Kõige olulisemad: High cohesion Low coupling Loose coupling
8 HIGH COHESION Süsteem jaotatud tükkideks Iga tükk... Lahendab ainult ühte probleemi või alamprobleemi
9
10 LOW & HIGH COHESION
11 LOW & LOOSE COUPLING low coupling moodulil vähe sõltuvusi puuduvad ringsõltuvused loose coupling selgelt defineeritud liidesed. sisemiste detailide varjamine
12 LOW COUPLING
13 LOOSE COUPLING
14 HEA ARHITEKTUURI EELISED Rakendust on kerge lugeda kasutada muuta testida
15 KERGE LUGEDA igal tükil selge eesmärk silme ees ainult oluline parem ülevaade struktuurist
16 KERGE KASUTADA Kasutatav komponent võib olla koodina rakenduse sees teegina rakenduse küljes veebiteenuse taga
17 KERGE MUUTA Kõigepealt tuleb aru saada muudatuste piiratud mõju süsteemile ( ripple effect )
18 KERGE TESTIDA võimalik isoleerida ja mock ida sõltuvuste asemel dummy d kerge eri situatsioone läbi mängida
19 MIS ON ARHITEKTUUR Palju definitsioone Kõik on õiged Arhitektuur vs disain semiootikute pärusmaa
20 VEEBIRAKENDUSTE ARHITEKTUUR
21 HTTP PROTOKOLL Kuidas organiseerida baidijada? TCP / IP
22 HTTP PROTOKOLL Kuidas organiseerida baidijada? Millal algab? Kui pikk on (millal lõppeb)? Mis formaadis?
23 HTTP PROTOKOLL
24 HTTP PROTOKOLL Üldlevinud Kerge kasutada Kerge testida Sobib peaaegu igale poole Palju töövahendeid
25 HTTP PÄRING GET / HTTP/1.1 \r\n Host: localhost \r\n \r\n
26 HTTP VASTUS HTTP/ OK \r\n Content-Type: text/html \r\n Content-Length: 25\r\n \r\n <!DOCTYPE html>\r\n <html>\r\n
27
28 MITU ARHITEKTUURI KORRAGA klient-server kihiline & N-tier objekt-orienteeritud komponentidel põhinev mikroteenustega
29 VEEBIRAKENDUSTE LIIKE Thin-client veebirakendused Fat-client veebirakendused Veebiteenused REST liidesega SOAP (lõputu peavalu allikas!)
30 THIN CLIENT Server koostab HTML i Piiratud interaktiivsus Näiteks lihtsamad rakendused registreerimisvormid
31
32 FAT CLIENT Web 2.0 Server edastab koodi ja andmed Ekraanipilt valmib kliendi poolel Interaktiivne Asendab sageli arvutiprogramme
33
34 REST LIIDES Süsteemide ühendamiseks Standardse HTTP abil GET, POST, DELETE Sageli JSON andmeformaadis
35
36 MODEL-VIEW-CONTROLLER model andmemudel äriloogika view kasutajaliidese genereerimine
37 MODEL-VIEW-CONTROLLER controller vahendaja maailma ja rakenduse vahel suhtleb äriloogikaga otsustab millist view d näidata
38
39 FAT CLIENT staatiline html leht + javascript ajax kaudu andmete lugemine ja kirjutamine kontroller vahendab andmeid sisuliselt REST liides
40 REST LIIDES Lihtsustatud kontroller Ainult töötleb andmeid Ei tegele kasutajaliidesega
41 EELISED Väga hea vastutuste jagamine Lihtne testida Parem interaktiivsus ja kasutajamugavus
42 VEEBIRAKENDUSED JAVAS
43 VEEBIRAKENDUS JAVAS Pakendatud.war faili sisse tavaline zip fail Paigutatakse java serverisse teise nimega konteiner vastutab HTTP protokolli eest
44 JAVA KONTEINERID Tomcat Jetty TomEE Wildfly
45 MOODSAD ALTERNATIIVID Konteiner lisatakse teegina rakenduse sisse Käivitatakse otse käsurealt Pakendatakse standardse java arhiivina (jar)
46 SERVLET public class HelloWorld extends HttpServlet... doget(request, response) dopost(request, response) dodelete(request, response)
47 SERVLET API protected void doget( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { response.getwriter().println("hello world"); }
48 MODEL VIEW CONTROLLER private UserService service; protected void doget(request, response) { String = request.getparameter(" "); User user = service.getuser( ); request.setattribute("user", user); //TODO: render view
49 MODEL VIEW CONTROLLER request.getrequestdispatcher( "/WEB-INF/views/userDetails.jsp").forward(request, response);
50 MODEL VIEW CONTROLLER Spring public String listusers(model viewmodel) {... viewmodel.addattribute("user", user); return "userdetails"; }
51 JSP - Java Server Pages Tekstifail HTML genereerimiseks Kompileeritakse servletiks <h1>kasutaja andmed:</h1> <p> Eesnimi: ${requestscope.user.firstname} </p>
52 JSP Tag libraries Custom tagid keeruliste lehtede ehitamiseks <ul> <c:foreach items="${employees}" var="emp"> <c:if test="${emp.isactive}"> <li>${emp.name}</li> </c:if> </c:foreach> </ul>
53 JAX-RS Standard REST-liideste ehitamiseks Kerge andmeid JSON ja XML formaadist konverteerida
54 public class UsersEndpoint public List<User> getactiveusers() { return service.getactiveusers(); }
55 STARTER KITS Kõik ühes kogumikud, sh server Spring Boot Dropwizard
56 ALTERNATIIVID SERVLETILE Play! Framework Spark Framework Grizzly.
57 KOKKUVÕTE Java on väga hea vahend veebirakenduste loomiseks Optimeeritud keeruliste rakenduste jaoks Palju tööriistu ja raamistikke Kõige suurem community
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