[aerogear-dev] SwitchYard/Camel Integration

Bruno Oliveira bruno at abstractj.org
Wed Jan 2 14:02:06 EST 2013 



-- 
"The measure of a man is what he does with power" - Plato
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@abstractj
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Volenti Nihil Difficile



On Wednesday, January 2, 2013 at 12:34 PM, Daniel Bevenius wrote:

> Hey Bruno, 
> 
> I totally agree. I should have been more clear regarding these controller classes, they would not be part of AeroGear-controller but as separate projects.
+1 
> 
> 
> > Would be nice to have Camel support as an additional plugin on AG Controller to our enterprise scenarios, but now would be important to finish our pagination support on Controller, at least for CR1.
> The paging support is completed and just needs to be reviewed and merged. 

Hi Dan, let's start another thread about pagination, but would be nice to have some examples of usage to test against this implementation, maybe with cURL. In this way we can make it easier to be implemented by the client side.
 
> I'm not sure that this integration is a requirement for CR1, only that we look into it like we have done. The actual work might be for a later release perhaps. 
> 
> > On security, Camel will only support Spring and Apache Shiro, we need to measure how hard would it be to add PicketLink support. 
> I was thinking that AeroGear Security could be used as sort of a front-end security layer when used with AeroGear Controller. If the target Camel "service" uses Spring Security or Apache Shiro that would have to be configured in the Controller class. So the two would be decoupled from each other.

In this scenario, AG security support is not necessary I guess, only PicketLink support as an additional component, maybe (http://code.google.com/a/apache-extras.org/p/camel-extra/).  
> I might be missing something here and need to look into it more carefully...more thinking out loud at the moment :)
> 
> cheers, 
> 
> /Dan
> 
> 
> 
> On 2 January 2013 15:02, Bruno Oliveira <bruno at abstractj.org (mailto:bruno at abstractj.org)> wrote:
> > Hi Dan, Camel support on controller is a good idea, on the other hand we must keep AG controller simple as is to cover of our developers' case with simple needs, I guess. Would be nice to have Camel support as an additional plugin on AG Controller to our enterprise scenarios, but now would be important to finish our pagination support on Controller, at least for CR1.
> > 
> > Maybe file a JIRA or add it to our AG Controller roadmap? On security, Camel will only support Spring and Apache Shiro, we need to measure how hard would it be to add PicketLink support.
> > 
> > 
> > --
> > "The measure of a man is what he does with power" - Plato
> > -
> > @abstractj
> > -
> > Volenti Nihil Difficile
> > 
> > 
> > 
> > On Wednesday, January 2, 2013 at 11:41 AM, Daniel Bevenius wrote:
> > 
> > > Hey Matthias,
> > > 
> > > there has been a discussion about having something like what you describe for this.
> > > At the moment there is not much to it, and if I was going to do this sort of integration I think I'd use the Camel/SwitchYard APIs directly, but having this as a reference or as a starting point would certainly help. With the examples in the post hopefully we can decide if we should provide an implementation, or if we should just have this more as a guide.
> > > 
> > > cheers,
> > > 
> > > /Dan
> > > 
> > > 
> > > 
> > > On 2 January 2013 14:27, Matthias Wessendorf <matzew at apache.org (mailto:matzew at apache.org) (mailto:matzew at apache.org)> wrote:
> > > > Hi Dan,
> > > > 
> > > > looks nice and simple. One quick question, is there more as a guide, or is there a plan to have some "plugins" (e.g. an additional JAR containing something like you described for the CamelController.java)?
> > > > 
> > > > Greetings,
> > > > Matthias
> > > > 
> > > > On Wed, Jan 2, 2013 at 2:16 PM, Daniel Bevenius <daniel.bevenius at gmail.com (mailto:daniel.bevenius at gmail.com) (mailto:daniel.bevenius at gmail.com)> wrote:
> > > > > 
> > > > > AeroGear Camel/SwitchYard Integration
> > > > > 
> > > > > There have been inquiries about how existing services could be exposed using AeroGear Controller, and this document will try to sort out why someone would want to do this, and also try to come up with some possible solutions.
> > > > > 
> > > > > Why would you want to do this?
> > > > > 
> > > > > Currently one can already expose a service as a RESTful endpoint in Camel using Camel's CXFRS Component (http://camel.apache.org/cxfrs.html). The same goes for a service in SwitchYard that can be exposed using the RestEasy Component (https://docs.jboss.org/author/display/SWITCHYARD/RESTEasy+Bindings).
> > > > > 
> > > > > 
> > > > > So, a few reasons why users might opt to expose their services through AeroGear controller:
> > > > > 
> > > > > Consistent way of exposing enterprise services externally for mobil developers
> > > > > Security
> > > > > Camel Integration
> > > > > 
> > > > > Using Camel to integrate with existing services is a great option as Camel has a huge number of components (http://camel.apache.org/components.html). There is a SwitchYard Camel component too, so integrating with SwitchYard would also be possible using Camel. SwitchYard also has a new RemoteInvoker (https://docs.jboss.org/author/display/SWITCHYARD/Remote+Invoker) which could be used for SwitchYard specific services and would be a separate controller class.
> > > > > 
> > > > > 
> > > > > The goal here is to make things as flexibile as possible as it is difficult to try to account for different types of services. As a suggestion, an AeroGear Controller route that invokes a service using Camel might look like this:
> > > > > 
> > > > > public class Routes extends AbstractRoutingModule { @Override public void configuration() throws Exception { route() .from("/cars/{id}") .on(RequestMethod.GET) .to(CarServiceController.class).getCar("direct://input", param("id")); } }
> > > > > 
> > > > > 
> > > > > CarServiceController.class might look something like this:
> > > > > 
> > > > > public class CarServiceController extends CamelController { public String getCar(final String endpointUri, final String id) { return (String) producerTemplate().requestBody(endpointUri, Long.valueOf(id)); } }
> > > > > 
> > > > > 
> > > > > CamelController is very simple and gets injected with a CdiCamelContext and creates the ProducerTemplate.
> > > > > 
> > > > > public abstract class CamelController { @Inject private CdiCamelContext camelContext; private final ProducerTemplate producer; public CamelController() { producer = this.camelContext.createProducerTemplate(); } protected ProducerTemplate producerTemplate() { return producer; } }
> > > > > 
> > > > > 
> > > > > We are simply making an instance of ProducerTemplate (http://camel.apache.org/maven/current/camel-core/apidocs/org/apache/camel/ProducerTemplate.html) available to users, and they have access to all the methods of that interface. This will enable users to send one way messages, request/response messages, and also prepare the arguments to the service and process the result if needed.
> > > > > 
> > > > > 
> > > > > A ProducerTemplate is created from a CamelContext. One can have multiple CamelContext's per application/deployment but the most common is that each deployment has one CamelContext. In this case we are injecting CdiCamelContext.
> > > > > 
> > > > > 
> > > > > We could also add additional methods from ProducerTemplate to CamelController which just delegate, for example:
> > > > > 
> > > > > public abstract class CamelController { @Inject private CdiCamelContext camelContext; private final ProducerTemplate producer; public CamelController() { producer = this.camelContext.createProducerTemplate(); } protected ProducerTemplate producerTemplate() { return producer; } protected Object requestBody(final String endpointUri, final Object body) { return producer.requestBody(endpointUri, body); } //...more methods like requestBody }
> > > > > 
> > > > > 
> > > > > This would save subclasses from having to call producerTemplate().
> > > > > 
> > > > > SwitchYard Integration
> > > > > 
> > > > > As mentioned above, SwitchYard has a RemoveInvoker that could be used for invoking services from a remote client. This could be used in an AeroGear route:
> > > > > 
> > > > > public class Routes extends AbstractRoutingModule { @Override public void configuration() throws Exception { route() .from("/server1/{id}") .on(RequestMethod.GET) .to(SwitchYard.class).invoke( "http://localhost:8080/switchyard-remote", "CarService", pathParam("id")); } }
> > > > > 
> > > > > 
> > > > > SwitchYard is again very simple:
> > > > > 
> > > > > public class SwitchYard { public static final String REMOTE_SERVICE = "urn:com.example.switchyard:remote"; public Object invoke(final String url, final String serviceName, final Object payload) throws IOException { return new HttpInvoker(url).invoke(new RemoteMessage() .setContext(new DefaultContext()) .setService(new QName(REMOTE_SERVICE, serviceName)) .setContent(payload)) .getContent(); } }
> > > > > The original gist can be found here: https://gist.github.com/4152998
> > > > > 
> > > > > 
> > > > > _______________________________________________
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> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > --
> > > > Matthias Wessendorf
> > > > 
> > > > blog: http://matthiaswessendorf.wordpress.com/
> > > > sessions: http://www.slideshare.net/mwessendorf
> > > > twitter: http://twitter.com/mwessendorf
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