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I have one question about how to construct app with vaadin and rest to gain good performace and scalability. I want to make rest api as a business layer and vaadin as ui for web. Ive made this decision cause my app will be also available as standalone version and on mobile os (ios and android). For me this idea is good if we are speaking about scalability but what about performance. Lets take about 5 thousand concurrent users for example.
I want to know general data about performance and will it be good for a lot of concurrent users. Only vaadin is hard to gain good performance with a lot of concurrent users (cause anyway almost all the code is running on the server). And if we also add rest api for any vaadin operation inside im scared that i will gain fatal combo.
Of course vaadin and rest api are located on the same server.
What do you think about it? Thanks a lot for answers.
I don't think it is a good idea, as Vaadin is a server side framework, so every action you do goes to the server, and from there on it has to make another rest service call to another server from where you have to get data and render it. I would rater suggest you to try some client side frameworks like ExtJS, Jquery, Angular JS, GWT etc... You render your UI on the client side using these frameworks and any action which requires data ops like fetching data or perform transactions you can make a rest service call to the server side. Using this approach you can avoid another redirection.
Now a days you the concept of RWD is getting popular, I think this would be a great choice for your use case. Build once deploy on any device :)
BTW, this is purely my opinion.
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I am working an E-commerce buy sale online asp.net mvc website. I am working in a group. we are beginners. we are confused about the fact that how we will be connecting an asp.net mvc app with java based android app? For example how android app will connect to the database which website is using. to be more specific how the same database will be synchronized with both platforms. kindly share the approach(s) to do that wisely. Thanks
Quite simply, there is usually no "direct" conversion or merge between a MVC web site and a mobile app.
Your best bet may be to try to make the MVC site responsive (i.e. Friendly to devices with different screen sizes) so that it can easily be displayed on a phone or tablet. You can then "merge" them that way. (I've never tried it personally, but a Web View may work here). So you'd achieve the "merge" by sometimes showing them your app code and sometimes showing them your mobile site (preferably as seamlessly as possible). Again, I've never tried that personally, but it's worth looking into whether that could work for you.
If you want to convert the code itself, the way you'd go about it is to first separate the server-side business logic from the client-side logic. The client-side logic (screen construction and whatnot) goes in the mobile device and the server-side business logic goes in a Web API RESTful service.
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I'm working on a prototype app to showcase an idea of mine -- so it need not be fully secure or gold standard, just needs to get the job done
I am wondering what the simplest option is to retrieve & parse, as well as publish JSON files from/to my Github repository. I am unsure which would be the easiest to implement. Right now, I see a few choices, but I am sure there are others you guys know of:
Using a Service class, which utilizes the Handler, AsyncTask, and HttpURLConnection classes (I've done a tutorial on Barry Burd's Android Application Development All-in-One For Dummies, 2nd Edition in which I made a weather app that utilized a service). I am still somewhat iffy with this.
A much easier, straightforward usage of HttpUrlConnection in this answer. I understand this fully.
A more complicated version in the developer docs. I do not really get this implementation either.
Also, the process can't freeze up the UI.
There is some cleaner and better approaches. You can use lots of libraries for this purpose.
Volley
Retrofit
These two are some of best libraries for calling webservise apis and I recommend Retrofit because it keeps your codes more clean and reusable.
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I have to submit a project in my college for which I have only two months! I already have an idea of what to make but don't know which technology to go for. I want to use something latest so as to make my project more efficient and flexible.
I wanted to make something like "Attendance Management System" in which we can take attendance of students and save the records on underlying database, also to perform some kind of data mining on the data (to find some interesting patterns like the_most_attended_lecture or to apply some probabilistic model to estimate the_next_possible_bunk or analysis based on an individual student record to compute anything interesting...) and then to develop an android app for the UI that can handle request and response to the database.
I'm really confused as what to go for? Currently I have no knowledge of the following but my friend suggested me to choose among them: node.js (with express framework) REST API, PHP, JSP, JSON, and MongoDB.
I would really appreciate your help guys. Please help. Thanks
Lets try to decide the technology stack according to your requirements.
1. Latest technology - Although you didn't give any justification for this requirement. But as you want, latest fads going on are for web server are node, go lang, nginx(if you happen to choose php in the end) and mongo, elastic search for data store.
2. Less amount of time - You have only 2 months to learn the technology, build the prototype , design the db schema, implement everything and test. Hence I will suggest you to go with node.js or php(I am assuming you are familiar with JS and php).
3. High database IO - I don't know what scale you will be working upon but the only major thing you server will be doing is DB IO, hence you should choose some non-blocking technology and among them most famous is NODE.JS.
Node.js is something which is fulfilling every requirement.
If I were you, I would have choose express.js (express init and you are ready to go), Mysql (If you are not familiar with any NoSql as mysql seems to be fulfilling every requirement). And android app could be anything like cordova as app is doing nothing but HTTP request and some presentation of data.
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I've always been a backend C/C++ developer. Working on a Java project (Netbeans), and I am trying to figure out how to do the front-end/UI. While I am a pretty good back-end dev, I haven't really been keeping up with the latest and greatest in frameworks, etc. for the front-end.
The Java back-end component can communicate with JSON over websockets. I am trying to figure out what front-end framework I should use. I also don't want to recreate my project, and would just like to add to my current Maven web application project.
So what's the verdict? What's hip and cool these days? HTML5? JQueryUI? (are they even mutually exclusive?)
Should also mention that I just want to make a quick UI, b/c I am planning on handing off the task to another programmer for a "proper" front-end component later on. At the same time, I do want my version to be "decent". So, in a nutshell, I want something that is easy to use, but still capable.
Thanks!
Assuming this a web app, Angular is getting popular and Bootstrap has been popular for a while. Use pre-built templates you can find for free or at a site like http://themeforest.net . Don't waste your time trying to code your own, unless its super simple.
You probably want to also think about how the backend will communicate with the front if you haven't already. For example, will it use Servlets, or a framework like Spring Roo? You can also build the front in a completely different language, like PHP, as PHP outsourcing is cheaper and easier to find than Java . PHP is a server side language like Java, but I'm talking about a situation where the website's backend communicates with the java backend via an API or sharing a DB. PHP has many MVC frameworks such as Symfony and Laravel.
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I am currently in the process of analyzing the work of developing REST APIS for an Iphone Application using Java:
Firstly, Has anyone worked on development of REST APIs for iPad app or any other kind what is the kind of duration that requires to do it...and are there frequent changes in the REST APIs so that the project is a long one and my job is secure...or in general once you make APIS in 4-5 months maximum then that is THE END?
Are they something that a guy like me with no such experience in development of REST APIs can take up, are they in general something that only a guy with relevant experience can do?
If there are any good material on the internet about making them or anyway for me to get started with and go ahead with this:
I have just received the information that we need to develop 6-7 APIs for a start,,,any experienced guys about how much time it can take here is a sample workflow:
We have to click on Google maps..and based on longitude and lattitude we have to find a list of wholesale dealers related to our domain in that point and have to fetch them in JSON/XML Object...
Once the APIs are there, they are there and shouldn't change too often because it could break the app. So better put a lot of thought in the API design before you release it. How long it takes depends completely on the project. I can develop a REST API in a day, it could also take months, depending on the complexity.
It will take longer if you are inexperienced because you will need to do a lot of reading, especially when it comes to the architecture of the APIs. Again, impossible to say because we don't know your current skill-set. But in general: sure, if you are willing to learn you can do it, I don't see anything that would prevent you.
Lots of.. for a good framework have a look at Jersey. I also once found a good read about REST APIs in general: Link
As a conclusion, it's not necessarily only about developing the APIs, but also about the data you are trying to provide. Does that data already exist? Can you query it easily? How much logic do you still need in order to provide useful APIs? Those are the questions you should ask yourself as well.