Re: [ecf-dev] Consuming a CXF/DOSGi based Service with ECF Client?

[ahmed.aadel@xxxxxxxxxxxxxxxxxx]

Hi Marcus,

Both ECF and CXF/DOSGi  uses ZooKeeper
as a tool to implement very differently [1] their own discovery
mechanism. But they're not "complaint"  with each other
(and shouldn't per se).  
So, if, let's say, in endpoint A
you're o.a.  publishing OSGi services using CXF/DOSGi (without any
ECF),  you' ll not get those services discovered in endpoint B
using ECF (without any CXF/DOSGi). They're not aware of each other's
publications as they're using different discovery each.
I hate to answer one question by another,
but  mind this one :) Why aren't you running ECF RSA [2] in
 in parallel with  CXF/DOSGi  RSA implementation as there
is no restriction on the number of Remote Service Admin's you can run within
one environment? This way, you get  seamlessly all ECF discovery and
distribution power  for free while still using CXF/DOSGi and without
any non- OSGi specs bridging need !

>..
>On the other hand, ECF seems to write the serialization
of an 
>IServiceInfo object (wrapped into an 
>org.eclipse.ecf.provider.zookeeper.core.AdvertisedService object) to
the 
>ZooKeeper node. The output of ZooKeeper for such a node is:
>..
Not the whole  service (IServiceInfo)
object but only  its properties are  serialized and written down
the underlying ZooKeeper node

>..
>I think I have to write a new WatchManager implementation
to read the 
>CXF/DOSGi XML service descriptions and to build IServiceInfo objects
>based on these. Is that feasable? Should I replace/extend the 
>implementation or is there a way to register a new one?
>..
You don't need to. If you still want
only to bridge with ECF Discovery allowing service published by CXF/DOSGi
to get discovered by ECF, then I think you should publish all (to expose)
services by explicitly registering them via ECF Discovery (in this case,
have a look in page linked by  [1] on how to do it) .

[1] http://wiki.eclipse.org/Zookeeper_Based_ECF_Discovery

[2] http://eclipseecf.blogspot.com/2011/01/ecf-35-supports-osgi-42-remote-services.html



Hope this helps and please do post back
for any further help 

Ahmed
remainsoftware.com

From:	Marcus Engelhardt <bernie_bo@xxxxxx>
To:	ecf-dev@xxxxxxxxxxx
Date:	22-06-2011 14:33
Subject:	Re: [ecf-dev] Consuming a CXF/DOSGi based Service with ECF Client?

---

I think CXF/DOSGi does register an XML description
of the service. In 
case of my test service this look like:

<?xml version="1.0" encoding="UTF-8"?>
<endpoint-descriptions xmlns="http://www.osgi.org/xmlns/rsa/v1.0.0">
<endpoint-description>
<property name="endpoint.framework.uuid" 
value="7464d128-cdc6-4817-bba8-c89ac18f2d54" />
<property name="endpoint.id" value="http://localhost:9191/libraryservice"
/>
<property name="endpoint.package.version.de.bht.pfk.serviceinterface"
value="0.0.0" />
<property name="endpoint.service.id" value-type="Long"
value="31" />
<property name="objectClass">
<array>
<value>de.bht.pfk.serviceinterface.LibraryServiceREST</value>
</array>
</property>
<property name="org.apache.cxf.rs.address" 
value="http://localhost:9191/libraryservice"
/>
<property name="org.apache.cxf.rs.databinding" value="jaxb"
/>
<property name="service.imported" value="true" />
<property name="service.imported.configs">
<array>
<value>org.apache.cxf.rs</value>
</array>
</property>
<property name="service.intents">
<array>
<value>HTTP</value>
</array>
</property>
</endpoint-description>
</endpoint-descriptions>

On the other hand, ECF seems to write the serialization of an 
IServiceInfo object (wrapped into an 
org.eclipse.ecf.provider.zookeeper.core.AdvertisedService object) to the
ZooKeeper node. The output of ZooKeeper for such a node is:

¼Ý ?sr ?java.util.HashMap?+-+?`Ð? ?F
loadFactorI thresholdxp?@ ? t ?discovery.service.locationsr
?java.net.URI¼?x.C×I½? ?L ?stringt ?Ljava/lang/String;xpt 
Cecf.osgirsvc://localh
ost:9278/osgirsvc_9s+cJod3za4BEOTmyD7Y6i4nSD4=xt 
?node.property.name.protocolsur
?[Ljava.lang.String;¡ÊVþÚ?{G? xp ?t defaultt ?node.property.name.servicesuq
~ ?t ?ecf.osgirsvct §node.property.name.nat ?ianat 
?discovery.service.priority
sr ?java.lang.Integer?Ôáñ¸?ç8? ?I ?valuexr ?java.lang.Numberå¼ò??öÓï? xp
t ?
discovery.service.weightq ~ ?t node.property.service.propertiessr 
+org.eclipse.
ecf.discovery.ServiceProperties±ºƒ¢ô-ƒ2? ?L ?propst 
?Ljava/util/Properties;xpsr
¶java.util.Properties9?ðzp6>ÿ? ?defaultsq ~ ?xr 
?java.util.Hashtable?+¤%!Jõ©? ?F

loadFactorI thresholdxp?@ ? t ?endpoint.service.idt ?58t Fen
dpoint.package.version.org.eclipse.ecf.examples.remoteservices.hellot 
?3.0.0t ?o
bjectClasst 4org.eclipse.ecf.examples.remoteservices.hello.IHellot 
?endpoint.fra
mework.uuidt $3815d16d-d0fb-40b8-8922-260ebb056fb8t 
?remote.intents.supportedt ?
passByValue exactlyOnce orderedt ?ecf.endpoint.id.nst 
¶ecf.namespace.r_osgit ?re
mote.configs.supportedt ¤ecf.r_osgi.peert ?endpoint.idt 
?r-osgi://localhost:9278
t ?service.imported.configsq ~ )xpt ?node.property.service.namet 
%osgirsvc_9s+cJ
od3za4BEOTmyD7Y6i4nSD4=t ?node.property.name.scopeq ~ x

The method 
org.eclipse.ecf.provider.zookeeper.core.ZooDiscoveryContainer::registerService(IServiceInfo
serviceInfo) delegates the registration of the service infos to 
org.eclipse.ecf.provider.zookeeper.node.internal.WatchManager::publish(AdvertisedService
published) method.

I think I have to write a new WatchManager implementation to read the 
CXF/DOSGi XML service descriptions and to build IServiceInfo objects 
based on these. Is that feasable? Should I replace/extend the 
implementation or is there a way to register a new one?

Marcus

Am 22.06.2011 13:13, schrieb Markus Alexander Kuppe:
> On 06/22/2011 01:03 PM, Marcus Engelhardt wrote:
>> Hello guys,
>>
>> I am trying to consume a service which is exported by Apache CXF/DOSGi
>> to a SOAP/HTTP endpoint. The endpoint is published to the ZooKeeper
>> discovery which stores a note similar to the one described in
the
>> corresponding tutorial
>> (http://cxf.apache.org/dosgi-discovery-demo-page.html).
I have also
>> written an ECF based consumer according to the the "Hello
World" example
>> (r-osgi, zookeeper) found in the Apache dev repository.
>>
>> Unfortunately, the ECF based consumer is not notified by the ZooKeeper
>> discovery service about the presence of the CXF/DOSGi based service.
I
>> am not sure why this is happening. I also did export the service
with
>> ECF which worked very well. Therefore, my questions are:
>>
>> 1) Is it overall possible to consume such a service with a ECF
consumer?
> Should be possible. :)
>
>> 2) If yes, what is necessary to accomplish this? Do I have to
write an
>> adapter (I recognized that both, ECF and CXF/DOSGi) write the
service
>> metadata in different formats to the Zookeeper node) for it?
> What does the metadata look like for ECF and CXF?
>
> Markus
> _______________________________________________
> ecf-dev mailing list
> ecf-dev@xxxxxxxxxxx
> https://dev.eclipse.org/mailman/listinfo/ecf-dev

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