Blackberry web services - json

I am looking to expose an existing app as web service for use on the Blackberry. So I have some questions around the blackbery and its use of web services.
I am wonderings is it possible to use Restful web services (using JSON as the payload) on the blackbery or is SOAP the only web services the balckbery can do?
In recent times I have used the Jersey framework for web services in normal web apps and I think this would suit my current requirements,just need to know if this is possible on the blackberry. Effectively the blackbery would only need to send/recive/procees HTTP calls and JSON so I would imagine this would be possible?
Also I may have to use the enterprise blackberry server, how do I route requests to/from the app (and the enterprise server) to the back end existing app. Is this all seamless with some config settings on the enterprise server or does the the blackberry application need to handle this in a certain way?


You can definitely use a RESTful service and JSON on the BlackBerry. Depending on the version you are targeting you may have to download a JSON library. There is also a good reference guide at http://java.sun.com/developer/technicalArticles/javame/json-me/ you can look through.
The Enterprise server shouldn't affect your ability to use this, as you're essentially making the same calls a browser would, and it will know how to route that traffic.

Related

Universal Windows app with Web API

This question may broad to answer. But just give me idea/structure.
I'm planning to build a shopping cart app for Windows Store. My logic behind the app is
Developing Web API and hosting on server
Accessing those API through app and displaying data on XAML UI
Is that right? or any other logic that i need to follow?
Should i use MVVM?

Though it might be a little harder at first, using MVVM is always a good idea.
As for your logic, why do you need Web APIs for your cart app ?
Wouldn't it be more efficient to keep everything local ?

Best way to distribute Cloud HTML5 App

I thought PhoneGap was a simple wrapper for HTML5, but it looks like it does in fact compile into native in some way.
I have a Cloud based, HTML5 Single Page Web application that I just want to run full screen, and distribute via an app store.
Should I just create a PhoneGap App with an InAppBrowser?

If you intend to publish an HTML5-based app in a "native" app store sucha s Google Play or Apple Store, you have 2 options:
1- Implement your own native application using a webview to show your web-based app.
2- Use some existing framework like Phonegap/Cordova even you do not use the native API. The framework will already setup everything for you to just deploy your HTML5 code.
However, if your web app is meant to be hosted remotely (i.e. not run from local files), you may encounter problems when trying to publish in the Apple Store. They have some strict rules about remote content, and about publishing apps that may not provide much more value and/or functionality than a simple web-app can.
Best.

What is the purpose behind building of Apache Sling, Felix, Jackrabbit projects

I am asking a very basic question here.
Question is
I am using Apache Sling , Apache Jackrabbit, Apache Felix in my project as said by my instructor. I am trying to understand why these software is developed by Apache. I tried a lot on the internet,, but I didn't find any blog or wordpress blog, or any useful youtube video that explain all these projects. Can you explain me about these projects.
Why these projects developed?
What they do ?
and more questions like this
Previously I found the same doubt with Apache Hadoop, but all the material that I found on net is sufficient for me to get a feel of this project. This time I am struggling with Sling, Felix, Jackrabbit.
I will be very thankful for you. Waiting for your kind response.

The combination of Apache Jackrabbit, Apache Sling, and Apache Felix allows you to build web application.
Apache Jackrabbit is the reference implementation of the JCR API. The JCR API is to manage content repositories; to manage, for example, web content. A content repository is a mix between file system and a database.
The JCR API is specially made to deal with web content. Why use the JCR API, and why not use a relational database API? URLs are hierarchical, as in a file system. Relational databases don't easily support hierarchical access. Why not use a file system API? Because the JCR supports transactions, versioning, and a lot of other features that file system APIs don't support.
Apache Sling is a web framework based on the JCR API, and taking advantage of the features provided by the JCR API (15 Minute introduction).
Apache Felix is an OSGi container. It allows to seamlessly start, stop, and replace components of a web application (jar files, in a sense), while the web server is running. That means it allows you to change the application without having to restart the server.

Sling in very simple terms could be described as a REST API for JCR. you can use http requests to manage content inside the repository.
Additionally, Sling provides a mechanism to render that content in different ways for web consumption. you can use scripts (JSP for example) and the java code (servlets, pojos, etc) in the Felix container to process requests and deliver a request.
When a request is made for a particular node, Sling looks up for a property called sling:resourceType, this is a lookup key for rendering scripts. Then the appropiate script is executed using the node as input.
You could write different kinds for renderers and then use it to display your content in different ways.
For example, you could write two scripts full.json.jsp and short.json.jsp and then use them to render the same node in two different ways:
/content/app/node.full.json
OR
/content/app/node.short.json.
Sling basically matches tokens in the request URL to select an appropriate script.
They have a really nice cheat sheet that explains how request resolution and rendering works
it is a bit more complex than this, since everything is organized in resources and components. you want to check their site for more info

I had the same doubts. The best response I was able to find is in the official Sling page (https://sling.apache.org/)
(What is) Apache Sling, in a hundred words:
Apache Sling is a web framework that uses a Java Content Repository, such as Apache Jackrabbit, to store and manage content.
Sling applications use either scripts or Java servlets, selected based on simple name conventions, to process HTTP requests in a RESTful way.
The embedded Apache Felix OSGi framework and console provide a dynamic runtime environment, where code and content bundles can be loaded, unloaded and reconfigured at runtime.
So, resuming it:
Sling is a web framework --> using jackrabbit --> based/supported on JCR API.
You can see Apache Felix like a container with its manager.
Note that Sling started as an internal project at Day Software. It's the reason why some bundles/libraries are named like com.day, but in the ends they are two names for the same.
Also, if you want to be clear about Jackrabbit and JCR API you can visit the Jackrabbit's official page http://jackrabbit.apache.org/jcr/jackrabbit-architecture.html

loadrunner widgets - how do they match?

I am going to loadtest an application that is built using wickets framework and consists of several widgets/small applications within the main application.
Does Loadrunner support this kind of application infrastructure in any way?

Not familiar with wickets. Generally LoadRunner intercepts network traffic and generate script unless you are using protocols that based on browser like truclient, GUI and etc. If you know what network protocol used in that framework, LoadRunner should work.

How to do a JSON webservice

I need to create a webservice that will be used in iOS, Windows Phone and Android apps.
I've found many tutorials on the Internet but no one uses real JSON files.
I have an example of what I mean:
https://api.twitter.com/1/statuses/user_timeline.json?include_entities=true&include_rts=true&screen_name=tiste&count=2
Is it better to use a web service like Twitter or can we use only headers in PHP?
If it's the first, how can I do it?
Finally, is JSON the most suitable option for web service communication?

Most contemporary web apps are built around an api - they are called api-centric. Twitter is one of them. You are not the only one who needs to create a web frontend and apps for mobile platforms. Having an api for all those platforms is going to save you a lot of time.
This field is developing rapidly now. There are many frameworks(both client and server side) to choose from. Since you are not telling us which technology/programming language you are going to use, i can only suggest you to google an api-centric or a rest framework. If you extend your question, i'll give a more specific answer.
Meanwhile you can read the following general articles...
http://net.tutsplus.com/tutorials/php/creating-an-api-centric-web-application/
http://en.wikipedia.org/wiki/REST
http://en.wikipedia.org/wiki/OAuth
http://blog.programmableweb.com/2011/09/23/short-list-of-restful-api-frameworks-for-php/