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Posted to user@aries.apache.org by Brad Johnson <br...@mediadriver.com> on 2016/03/31 19:39:35 UTC
Service ranking...
I've set up separate bundles exposing the same service interface with
different ranking. The test stubs are low ranking and the production code
is higher ranking.
The problem is I'm seeing a first come, first served behavior and not
selection of service based on ranking. If I stop/uninstall a bundle then
the other service is immediately picked up as one would expect. But if I
restart a bundle, even if it has the highest service ranking, then the
lower ranking service is bound while the bundle with the higher ranking
service restarts. What I'd expected/hoped is that the manager would
automatically switch the proxy over to the higher ranking service if no
other filters are specified. Is there a setting or flag I'm missing that
would trigger that behavior?
Brad
Re: Service ranking...
Posted by Brad Johnson <br...@mediadriver.com>.
Christian,
I looked at the Jira issue and one of the questions you'd had in there was
about the terminology to use sticky|best, for example. Perhaps using the
same terminology as DS would be good - stick vs dynamic.
On Fri, Apr 1, 2016 at 11:34 AM, Brad Johnson <br...@mediadriver.com>
wrote:
> Thank you. This is greatly appreciated. Yes, I'm using it with
> Blueprint. I've created a Microwebserver that listens for registration
> events to bind SOAP/REST implementations. In the environment I'm working
> in various organizations are interoperating and have different security and
> data requirements so being able to bootstrap multiple microservers that
> listen for registration events and filter on a service property, inventory,
> invoices, etc. permits me a good way to do general set up of interceptors
> and providers and not have to replicate them.
>
> In order to do fast prototyping of web services I use stub data and
> register via some common OSGi interface like com.foo.InventoryService.
> That also means it is useful when I'm testing the deployments themselves.
> For example, I have a common API bundle and canonical data models. The
> "front end" registers itself and as picked up by the microsserver and
> exposed as a web service. It, in turn, picks up a "back end" interface
> that may be a test bundle or it may be the actual connection to some back
> end system (JDEdwards in one case). The back end does the calls to the
> SOAP services and dozer transforms to canonical models.
>
> What I'd like to be able to do during deployment is install the front end
> with the test bundles. Obviously the front end only knows it via the OSGi
> registry interface it is looking for and receives that. That would permit
> me to install my front end with the back end test bundles and run SOAP UI
> tests against everything to verify that everything is working. Then I want
> to install the higher ranking production bundles and would like those to
> automatically get switched.
>
> Part of the reason for that is that I have one test bundle that exposes
> all the back end services with a ranking of 3 but I have a multitude of
> back end bundles each exposing their own individual services. For example,
> the test bundle might have invoice, inventory, sales, etc. all exposed as
> services. But the actual bundle for inventory client services would only
> expose one interface.
>
> I'm also going to use that same architecture to enable remote service
> bundles when I want to do passthroughs. In other words, I might have a
> front end web service exposed with security, interceptors, etc. in a DMZ
> but when it pulls the service instead of hitting either a test or
> implementation bundle it will hit a passthrough call to another web service
> (I just Camel CXF routes in the bundle).
>
> The microserver works very well and I'm hoping to put it up on Github one
> of these days to make it available to the community. Many of my clients
> are looking for a more flexible microservices approach and a lot of them
> are Java developers who are not savvy to blueprint, Camel, etc. I actually
> had one recently who told me that Fuse/Camel/Servicemix isn't really Java.
> Well, they have something of a point, I guess.
>
> The other issue I'd looked at that is a bit of a hold up is the problem of
> not being able to use properties substitutions in filters. In other words,
> I can't have a cfg file that specifies TEST, PRODUCTION, REMOTE and have
> that used as a filter since that string has to be hard coded.
>
> I'll look at DS and see if it buys me anything in terms of flexibility.
>
> Thanks,
> Brad
>
> On Fri, Apr 1, 2016 at 3:44 AM, David Bosschaert <
> david.bosschaert@gmail.com> wrote:
>
>> Hi Brad,
>>
>> It depends a little bit on what technology you use to consume the
>> service. I guess you're using Blueprint since this mail is sent to Aries
>> and as Christian mentions there may be some work needed there.
>>
>> If you use Declarative Services you can get a re-binding behaviour by
>> using Dynamic (and/or Greedy) service references, which basically will have
>> the effect that your client is automatically rebound if a new service with
>> a higher ranking becomes available. You can see an example of such a client
>> here:
>> https://github.com/coderthoughts/primes/blob/master/client/src/main/java/org/coderthoughts/primes/client/PrimeClient.java
>> and
>> http://coderthoughts.blogspot.com/2016/02/branch-by-abstraction-and-osgi.html
>>
>> Cheers,
>>
>> David
>>
>> On 1 April 2016 at 06:58, Christian Schneider <ch...@die-schneider.net>
>> wrote:
>>
>>> The current behaviour is required by the spec. We plan to add an option
>>> to configure this https://issues.apache.org/jira/browse/ARIES-1314.
>>> Unfortunately I did not yet have the time to implement this.
>>>
>>> Christian
>>>
>>> 2016-03-31 19:39 GMT+02:00 Brad Johnson <br...@mediadriver.com>:
>>>
>>>> I've set up separate bundles exposing the same service interface with
>>>> different ranking. The test stubs are low ranking and the production code
>>>> is higher ranking.
>>>>
>>>> The problem is I'm seeing a first come, first served behavior and not
>>>> selection of service based on ranking. If I stop/uninstall a bundle then
>>>> the other service is immediately picked up as one would expect. But if I
>>>> restart a bundle, even if it has the highest service ranking, then the
>>>> lower ranking service is bound while the bundle with the higher ranking
>>>> service restarts. What I'd expected/hoped is that the manager would
>>>> automatically switch the proxy over to the higher ranking service if no
>>>> other filters are specified. Is there a setting or flag I'm missing that
>>>> would trigger that behavior?
>>>>
>>>> Brad
>>>>
>>>
>>>
>>>
>>> --
>>> --
>>> Christian Schneider
>>> http://www.liquid-reality.de
>>> <https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.liquid-reality.de>
>>>
>>> Open Source Architect
>>> http://www.talend.com
>>> <https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.talend.com>
>>>
>>
>>
>
Re: Service ranking...
Posted by Brad Johnson <br...@mediadriver.com>.
Thank you. This is greatly appreciated. Yes, I'm using it with
Blueprint. I've created a Microwebserver that listens for registration
events to bind SOAP/REST implementations. In the environment I'm working
in various organizations are interoperating and have different security and
data requirements so being able to bootstrap multiple microservers that
listen for registration events and filter on a service property, inventory,
invoices, etc. permits me a good way to do general set up of interceptors
and providers and not have to replicate them.
In order to do fast prototyping of web services I use stub data and
register via some common OSGi interface like com.foo.InventoryService.
That also means it is useful when I'm testing the deployments themselves.
For example, I have a common API bundle and canonical data models. The
"front end" registers itself and as picked up by the microsserver and
exposed as a web service. It, in turn, picks up a "back end" interface
that may be a test bundle or it may be the actual connection to some back
end system (JDEdwards in one case). The back end does the calls to the
SOAP services and dozer transforms to canonical models.
What I'd like to be able to do during deployment is install the front end
with the test bundles. Obviously the front end only knows it via the OSGi
registry interface it is looking for and receives that. That would permit
me to install my front end with the back end test bundles and run SOAP UI
tests against everything to verify that everything is working. Then I want
to install the higher ranking production bundles and would like those to
automatically get switched.
Part of the reason for that is that I have one test bundle that exposes all
the back end services with a ranking of 3 but I have a multitude of back
end bundles each exposing their own individual services. For example, the
test bundle might have invoice, inventory, sales, etc. all exposed as
services. But the actual bundle for inventory client services would only
expose one interface.
I'm also going to use that same architecture to enable remote service
bundles when I want to do passthroughs. In other words, I might have a
front end web service exposed with security, interceptors, etc. in a DMZ
but when it pulls the service instead of hitting either a test or
implementation bundle it will hit a passthrough call to another web service
(I just Camel CXF routes in the bundle).
The microserver works very well and I'm hoping to put it up on Github one
of these days to make it available to the community. Many of my clients
are looking for a more flexible microservices approach and a lot of them
are Java developers who are not savvy to blueprint, Camel, etc. I actually
had one recently who told me that Fuse/Camel/Servicemix isn't really Java.
Well, they have something of a point, I guess.
The other issue I'd looked at that is a bit of a hold up is the problem of
not being able to use properties substitutions in filters. In other words,
I can't have a cfg file that specifies TEST, PRODUCTION, REMOTE and have
that used as a filter since that string has to be hard coded.
I'll look at DS and see if it buys me anything in terms of flexibility.
Thanks,
Brad
On Fri, Apr 1, 2016 at 3:44 AM, David Bosschaert <david.bosschaert@gmail.com
> wrote:
> Hi Brad,
>
> It depends a little bit on what technology you use to consume the service.
> I guess you're using Blueprint since this mail is sent to Aries and as
> Christian mentions there may be some work needed there.
>
> If you use Declarative Services you can get a re-binding behaviour by
> using Dynamic (and/or Greedy) service references, which basically will have
> the effect that your client is automatically rebound if a new service with
> a higher ranking becomes available. You can see an example of such a client
> here:
> https://github.com/coderthoughts/primes/blob/master/client/src/main/java/org/coderthoughts/primes/client/PrimeClient.java
> and
> http://coderthoughts.blogspot.com/2016/02/branch-by-abstraction-and-osgi.html
>
> Cheers,
>
> David
>
> On 1 April 2016 at 06:58, Christian Schneider <ch...@die-schneider.net>
> wrote:
>
>> The current behaviour is required by the spec. We plan to add an option
>> to configure this https://issues.apache.org/jira/browse/ARIES-1314.
>> Unfortunately I did not yet have the time to implement this.
>>
>> Christian
>>
>> 2016-03-31 19:39 GMT+02:00 Brad Johnson <br...@mediadriver.com>:
>>
>>> I've set up separate bundles exposing the same service interface with
>>> different ranking. The test stubs are low ranking and the production code
>>> is higher ranking.
>>>
>>> The problem is I'm seeing a first come, first served behavior and not
>>> selection of service based on ranking. If I stop/uninstall a bundle then
>>> the other service is immediately picked up as one would expect. But if I
>>> restart a bundle, even if it has the highest service ranking, then the
>>> lower ranking service is bound while the bundle with the higher ranking
>>> service restarts. What I'd expected/hoped is that the manager would
>>> automatically switch the proxy over to the higher ranking service if no
>>> other filters are specified. Is there a setting or flag I'm missing that
>>> would trigger that behavior?
>>>
>>> Brad
>>>
>>
>>
>>
>> --
>> --
>> Christian Schneider
>> http://www.liquid-reality.de
>> <https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.liquid-reality.de>
>>
>> Open Source Architect
>> http://www.talend.com
>> <https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.talend.com>
>>
>
>
Re: Service ranking...
Posted by David Bosschaert <da...@gmail.com>.
Hi Brad,
It depends a little bit on what technology you use to consume the service.
I guess you're using Blueprint since this mail is sent to Aries and as
Christian mentions there may be some work needed there.
If you use Declarative Services you can get a re-binding behaviour by using
Dynamic (and/or Greedy) service references, which basically will have the
effect that your client is automatically rebound if a new service with a
higher ranking becomes available. You can see an example of such a client
here:
https://github.com/coderthoughts/primes/blob/master/client/src/main/java/org/coderthoughts/primes/client/PrimeClient.java
and
http://coderthoughts.blogspot.com/2016/02/branch-by-abstraction-and-osgi.html
Cheers,
David
On 1 April 2016 at 06:58, Christian Schneider <ch...@die-schneider.net>
wrote:
> The current behaviour is required by the spec. We plan to add an option to
> configure this https://issues.apache.org/jira/browse/ARIES-1314.
> Unfortunately I did not yet have the time to implement this.
>
> Christian
>
> 2016-03-31 19:39 GMT+02:00 Brad Johnson <br...@mediadriver.com>:
>
>> I've set up separate bundles exposing the same service interface with
>> different ranking. The test stubs are low ranking and the production code
>> is higher ranking.
>>
>> The problem is I'm seeing a first come, first served behavior and not
>> selection of service based on ranking. If I stop/uninstall a bundle then
>> the other service is immediately picked up as one would expect. But if I
>> restart a bundle, even if it has the highest service ranking, then the
>> lower ranking service is bound while the bundle with the higher ranking
>> service restarts. What I'd expected/hoped is that the manager would
>> automatically switch the proxy over to the higher ranking service if no
>> other filters are specified. Is there a setting or flag I'm missing that
>> would trigger that behavior?
>>
>> Brad
>>
>
>
>
> --
> --
> Christian Schneider
> http://www.liquid-reality.de
> <https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.liquid-reality.de>
>
> Open Source Architect
> http://www.talend.com
> <https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.talend.com>
>
Re: Service ranking...
Posted by Christian Schneider <ch...@die-schneider.net>.
The current behaviour is required by the spec. We plan to add an option to
configure this https://issues.apache.org/jira/browse/ARIES-1314.
Unfortunately I did not yet have the time to implement this.
Christian
2016-03-31 19:39 GMT+02:00 Brad Johnson <br...@mediadriver.com>:
> I've set up separate bundles exposing the same service interface with
> different ranking. The test stubs are low ranking and the production code
> is higher ranking.
>
> The problem is I'm seeing a first come, first served behavior and not
> selection of service based on ranking. If I stop/uninstall a bundle then
> the other service is immediately picked up as one would expect. But if I
> restart a bundle, even if it has the highest service ranking, then the
> lower ranking service is bound while the bundle with the higher ranking
> service restarts. What I'd expected/hoped is that the manager would
> automatically switch the proxy over to the higher ranking service if no
> other filters are specified. Is there a setting or flag I'm missing that
> would trigger that behavior?
>
> Brad
>
--
--
Christian Schneider
http://www.liquid-reality.de
<https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.liquid-reality.de>
Open Source Architect
http://www.talend.com
<https://owa.talend.com/owa/redir.aspx?C=3aa4083e0c744ae1ba52bd062c5a7e46&URL=http%3a%2f%2fwww.talend.com>