I am starting research on how to implement Node.js SOA (service oriented architecture) with JSON web-services.
As a small sub-question, I need an approach/framework/system to make universal configuration center for all companies web-services. So that we don't configure every application with exact address of other application, but just link to some central server to get that information.
(This should be very well worked-out topic for XML-based services, so some terminology/approaches/etc could/should be borrowed.)
Related to
RESTful JSON based SOA Registry
Service Oriented Architecture suggestions
UPDATE: This questions is about web-services configuration & orchestration.
GO for an active(having activity happening off late) framework with lean architecture.There's one called Geddy and another called Restify. If in doubt, Express can also be used for building webservices with JSON.
You can work on reading the centrally stored config from different app codebse when you use any of these.
Related
Currently we evaluate Activiti as a possible Open Source Business Process Engine. One important requirement is an easy integration of external systems (ECM, CRM, SharePoint, SAP...) within the processes. During research I found some articles claiming that there are no build-in connectors to other systems. The only way to interact with external systems is to invoke java classes (see http://forums.activiti.org/content/how-create-connector and http://books.google.de/books?id=kMldSaOSgPYC&pg=PA100&lpg=PA100&dq=Bonita+Open+Solution+connectors&source=bl&ots=uwzz5OSten&sig=h2wf0q5J3xAxwN3AZ7Vondemnec&hl=de&sa=X&ei=uwBYUtehHoTqswacrYHgDQ&ved=0CIUBEOgBMAc4Cg#v=onepage&q=Bonita%20Open%20Solution%20connectors&f=false)
How complex is the integration of external systems in Activiti processes? Is it true that there are no bulid-in connectors? This would be a showstopper-criteria for us.
best regards and thanks for you reply
Ben
Currently (as version 5.14) Activiti has direct connection to
Alfresco for document repository
Drools for rule tasks
LDAP for groups and users
Mule for sending messages
Camel for sending/receiving messages
To integrate any other external system you need to use Java Service Task, where you can use Java classes to delegate workflow to your external system. These Java classes can take variables from your workflow, can direct to one of its outgoing flows and of course you can use any capability of your external system.
We have project developed in Silverlight/DevForce services, currently we plain to move code into HTML5. My question is it possible to reuse server side part of project, I means is it possible to reuse DevForce services or better migrate to WebAPI services? IdeaBlade has Breeze Js for HTML5, but it looks more as dataservice provider and not support DevForce services.
You might be asking whether BreezeJS offers a mechanism for handling arbitrary service calls between the client and the Web API running on the server ... in the manner of the DevForce "invokeServerMethod".
BreezeJS does not . The DevForce "invokeServerMethod" is helpful when you need to talk to the server for non-data reasons. You don't have to open and secure your own channel; instead you can share the DevForce secure data channel between client and server. It's also a convenient way to sent a package of entities. Setting up your own independent channel is not much fun.
But writing and communicating with a Web API service endpoint is much easier. Our thought is that you can manage your non-data communications quite well without the help of the BreezeJS EntityManager. So we don't see the need to implement the equivalent of "invokeServerMethod"
However, perhaps you have a scenario that would cause us to reconsider. We'd love to learn more.
Breeze doesn't integrate with DevForce today. I'd recommend adding the request to the Breeze UserVoice site. The Breeze team uses UserVoice to judge interest when incorporating new features.
A quick look shows me that there is already one DevForce related suggestion there: Support for DevForce models.
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
this seems pretty basic, but I am rather new to web development so I am a bit stuck here. I have MongoDB running on the backend, which contains geo-spatial objects that in the front end should be displayed on a map. The communication between backend and web frontend is where I have knowledge gaps.
The user should be able to zoom to an area on a map that he is interested in, then press "Search". The backend would then find every entry in the database that has coordinates that are on the users current screen. It would transmit these to the frontend, ideally as a list of JSON objects. The frontend displays these on a map.
I have a front end mock up, code that puts data into MongoDB and code that queries MongoDB. I know that I am missing a server that can be queried from the frontend. I thought I use Jetty. But what do I need to do then? I guess I need Jetty to provide a JSON API that I can query from JavaScript. Could someone point me to the Jetty class or interface that I need to implement and maybe give a few lines of code on how to query this from JavaScript?
You have a very open question here.
To start with, Jetty is merely a Java Web Container (following a subset of the Java EE Web Profile), while it does have some AJAX/JSON capabilities, it is extremely fundamental and not hooked up into any sort of query API.
You would do better do use Jetty along with a proper REST/JSON API library for your project.
Some examples (these are not the only choices available):
jersey - Jersey - an Open Source JAX-RS (JSR 311) implementation for RESTful web services, with JSON Support - Here's Lars Vogel's Tutorial on JAX-RS using Jersey.
restlet - Restlet - another RESTful web API, with a JSON extension
resteasy - RESTEasy - another JAX-RS implementation for RESTful web services, with JSON marshalling.
Also note that there are many flavors of Java based JSON APIs and Libraries, you should probably be aware of them as you will encounter them in your journey to success.
In the end I found the Dropwizard framework (there might be others), which does a lot of the work that is necessary to get a simple JSON API up out of the box:
http://dropwizard.io/
I want to build a WCF Server with MySQL Database which can communicate with differents Clients on differents OS. Is that Possible?
if Yes, how should i go? any tutorials which can help me?
Cheers
Is that Possible?
Yes, interoperability was one of the main concerns of the WCF designers.
how should i go?
There are so many options you need to consider, for example security, reliability...
But mainly basicHttpBinding is probably the most interoperable SOAP-based binding. Just google for samples of basicHttpBinding.
On another account, the most interoperable WCF approach is WCF REST which can allow use of JSON that any client can understand, even the browser. However, implementation of WCF REST has quite a few design problems (outside scope of this question) and I would suggest using ASP NET MVC to implement passing JSON objects over HTTP. For security, you can use HTTPS.