Google's OpenSocial

OpenSocial ist eine Menge von Programmierschnittstellen für Anwendungen in webbasierten sozialen Netzwerken. OpenSocial wird von Google entwickelt und wurde am 1. November 2007 veröffentlicht. (Quelle: Wikipedia-OpenSocial)

Stichworte zum Bauen von Social Applications

• Gadgets bestehen hauptsächlich aus HTML und JavaScript.
  
• API Namensräume (Javascript) sind opensocial.* und gadgets.*
• Als Views gibt es in der Klasse gadgets.views.ViewType: Profile View, Canvas View und Home View.
• Datenhandling/Persistenz findet über opensocial.DataRequest statt. Hierzu zählt auch der Zugriff auf Personen, Beziehungen, Aktivitäten und Nachrichten.
• Der soziale Graph ist über opensocial.Person erreichbar. Rollen werden in VIEWER und OWNER unterschieden.
• Aktivitäten: opensocial.Activity. Activity Templates können hierbei häufige Updates kumulieren.
• Nachrichtenversand: opensocial.Message
• Internationalisierung über Message Bundles in der XML-Spezifikation des Gadgets möglich.
• Backend Requests, die über die Möglichkeiten von JavaScript und HTML hinausgehen sollen, können mit gadgets.io.makeRequest() abgesetzt werden. Somit ist der Transfer von HTML-, XML-, JSON- und ATOM-Files möglich. -> JSON, XML und AtomPub können auch über die RESTful API genutzt werden, die neben der JavaScript API existiert.

Quelle: OpenSocial Artikel von Matthias Häsel und Karsten Rieke - http://www.springerlink.com/content/d7624423x371w5v6/

Weitere Infos
Host OpenSocial Apps basierend auf Java oder PHP: Apache Shindig
Let's get this Shindig started

XING und OpenSocial:
XING and OpenSocial

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First Steps With Java on Google App Engine

Image via CrunchBase

These are my first steps, creating an Java based App with Google App Engine.

Pre-stuff to get it run first:

1. I sign up for an App Engine account.
   
   
2. Downloaded the App Engine SDK and installed the Eclipse plugin.
   
   
3. Create a new project as described in the Quick Start Reference.
   
   
4. The Quick reference says for deploying (after you have created an application): "Once you have an application ID, just right-click on your project, and select Google > App Engine Settings... from the context menu. Enter your application ID into the Application ID text box. Click OK."
   
   
   • I found it quite hard to find the ID until I realized that it is the name itself found in the "Application" column on my apps listing at http://appengine.google.com/. (This is more clear if you just created your app.) So its "peters-cafe" in my case.
     
     
5. Then just hit the turbine button (Deploy App Engine Project) within eclipse, and here we go...
   ...I thought, but got an error: "Unable to upload app: Error posting to URL: http://appengine.google.com/api/appversion/create?app_id=peters-cafe&version=1&
   400 Bad Request
   Invalid runtime or the current user is not authorized to use it."
   --Hmm
   
   
6. I re-checked the developers settings on the app dashboard, but I still was an active developer :-(
   
   
7. Tried wrong credential infos -> PSW doesn't match. So that must be right.
   
   
8. Found it here in Java FAQ: I'm getting "Invalid runtime specified." when I try to upload.
   Acctually I do not have permission to upload a Java app to my account. That's what they say: "To request permission to upload an app which uses the Java runtime, sign up at the following URL: http://appengine.google.com/promo/java_runtime . For now, access will be limited to the first 10,000 to sign up."
   -> sTo request permission to upload an app which uses the Java runtime, sign up at the following URL: http://appengine.google.com/promo/java_runtime . For now, access will be limited to the first 10,000 to sign up.
   -> so nothing to do here, but wait...

In the meantime: Develop Your Application
It is possible, to run the app local, of course, so I will start to develop and test my app locally.
My first steps, developing a Java application with Google App Engine will be reported soon.



Edit Post:

Finally
I got my permission to upload, so here we go: http://peters-cafe.appspot.com/
(Just the default app, currently)

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