Helma Workshop

Helma-WorkshopPhilipp Naderer

ASE-Projekt: Tenezhttp://www.tenez.at

philipp.naderer@tenez.at

Demo-Distribution

http://tenez.at/downloads/helma-1.6.3-inafara.zip

Helma?

JavaScript Web Application Server

Open Source – BSD-Lizenz

Mozilla Rhino zum Interpretieren

Rhino ist in der J2SE 6 fest verankert

Helma ist anders.

Helma ist anders!

Prototyp-basiertes Objekthandling

Ganz grob gesagt: Prototype = Klasse

Prototypen bestimmen Applikations-Layout

REST-konform - jeder Ressource wird eine URL zugeordnet.

/photographers/leibovitz/

Helma ist anders!Ruby on Rails: Helma:

application \-- models \-- controllers \-- helpers \-- views \-- photographer \-- agency \-- photo

application \-- Photographer |- Photographer.js |- Photographer.actions.js |- Photographer.macros.js |- preview.skin |- main.skin \-- Agency \-- Photo

Helma & JavaRhino ermöglich Zugriff auf Java-Klassen

Zugriff auf alle möglichen Java-Libraries!

Captchas, Chart-Rendering, ...

var url = new java.net.URL('http://orf.at‘);var host = url.getHost();

var bigInt = new java.math.BigInteger('1000000‘);res.write('Next prime: ' + bigInt.nextProbablePrime());

Request-HandlingIm Prototypen eine Funktion: ProtoName.prototype.methodenname_action()

Wird gemapped auf: /objektId/methodenname

Photo.prototype.delete_action = function() { // Request-Objekte: req res session root}

URL: /leibovitz/photos/1024/delete

RenderingrenderSkin(); renderSkinAsString();

Skins: /Prototype/skinname.skin

Macros: bezeichnung_macro(){...}

<li class="taskLine"> <% this.text %> <%// property %> <% this.status %> <%// status_macro() %></li>

DB-MappingFür jeden Prototype mit type.properties# Photographer/type.properties_db = photoworld_table = T_PHOTOGRAPHERS_id = PGR_ID_parent = agency.photographers, root

name = PGR_NAMEbirthday = PGR_BIRTHDAY

address = object(Address)address.local = PGR_ADDRESS_FKaddress.foreign = ADR_ID

photo = collection(Photo)photo.local = PGR_IDphoto.foreign = PHO_PHOTOGRAPHER_FK

REST-URLs/agency/magnum/photographers/philippnaderer

/Agency/type.properties_parent = root.agency

photographers = collection(Photographer)photographers.accessname = photographerUsername

/Root/type.properties

agency = collection(Agency)agency.accessname = agencyAlias

VererbungAlles, was für den Super-Prototypen definiert wird, erbt der Sub-Prototype.

Konstruktoren, Methoden, type.properties

_extends = SuperPrototypeName

Optional, aber üblich: Sub-Prototypen in selbe Datenbank-Tabelle ablegen# Dog/type.properties_extends = Animal_prototype = ANI_PROTOTYPE_NAME_extensionId = Dog (String oder frei wählbarer Integer)

Vererbung

Collections:Sub-Prototypes sind auch in Collections vom Super-Prototype enthalten

allUpdates = collection(Update)allUpdates.local = USR_IDallUpdates.foreign = UPD_CREATOR

StatusUpdate TaskUpdate

Update

Caching

DB

Obj1

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new old

Caching

DB

Obj1

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Obj26

Caching

DB

Obj1

Obj2

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Obj10

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Obj26

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Obj28cachesize/2 cachesize/2

cachesize = 12

Caching

DB

Obj1

Obj2

Obj3

new old

Obj26

Obj27

Obj28cachesize/2 cachesize/2

cachesize = 12

Sfârşit

(Ende)