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Re: [ecf-dev] Re: ecf-dev Digest, Vol 45, Issue 35
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Hi Roshan,
I have not yet completed the test case for activemq, as I have been
modifying the existing test cases (in org.eclipse.ecf.remoteservices) so
that provider-specific testing of remoteservices will be easier (both
for activemq provider and for other current/future providers). One
complicating factor is that testing using normal junit testing (i.e. all
tests in a single process) doesn't really test thing with remoting
properly...and so I've been modifying the tests to have an abstract
service host application (separate process)...i.e. via these classes:
org.eclipse.ecf.tests.remoteservice.AbstractConcatHostApplication
And a tests with an abstract service consumer:
org.eclipse.ecf.tests.remoteservice.AbstractConcatConsumerTestCase
There are also tests for the RFC 119 impl that are in
org.eclipse.ecf.tests.osgi.services.distribution. In particular, this
abstract test class
org.eclipse.ecf.tests.osgi.services.distribution.AbstractServiceRegisterTest
My intention is to create activemq-specific test cases, based upon these
abstract tests...both for ECF remote services API and for the RFC119
impl (which is based upon the ECF remote services API).
So, in any case, I will do what I can to get these activemq
provider-based tests in place this week. If you (Roshan) are
able/willing to help with this, please open a bug/enhancement request
and consider attaching code/code fragments of tests that you are
able/willing to contribute.
Note the mechanism here (for pub-sub containers) that remains to be
tested is implemented in
org.eclipse.ecf.osgi.services.distribution.DefaultProxyContainerFinder
This is a default proxy container finder...which currently has logic to
*connect* a container (to the pubsub group) if the
endpointDescription.getConnectTargetID() returns a non-null value (see
line 85 in DefaultProxyContainerFinder). For pubsub containers (e.g.
activemq) this getConnectTargetID() should/will be non-null and so
consumers will be connected to the identified pub/sub group before proxy
lookup occurs.
Note also that if you wish, you may define your own logic for
IProxyContainerFinder (and IHostContainerFinder) and implement as
desired (i.e. you don't have to use the DefaultProxyContainerFinder's
logic at all).
So, in any event...I'll be working on test code for this in the very
near future.
Thanks,
Scott
roshan joseph wrote:
Hi Scott,
Could you please point me to the test case you have created to test
the pub/sub for RFC 119 using the Activemq jms provider?
I am in the process of creating a sample proto type using ActiveMQ JMS
topic for my publish/subscribe of remote services through RFC 119
transparent way, hence this would be of great help.
I did look at the http://ecf1.osuosl.org/ site but did not find any
recent changes under the activemq packages. If you are still in the
process of testing this, can you give me some direction on how to
achieve pub-sub of remote services in a group through activemq and ECF
Thank you in advance...
Regards
Roshan
Date: Wed, 22 Apr 2009 10:18:25 -0700
From: Scott Lewis <slewis@xxxxxxxxxxxxxxxxx
<http://us.mc395.mail.yahoo.com/mc/compose?to=slewis@xxxxxxxxxxxxxxxxx>>
Subject: [ecf-dev] handling pub-sub providers with RFC 119
To: "Eclipse Communication Framework (ECF) developer mailing list."
<ecf-dev@xxxxxxxxxxx
<http://us.mc395.mail.yahoo.com/mc/compose?to=ecf-dev@xxxxxxxxxxx>>
Message-ID: <49EF5161.2020405@xxxxxxxxxxxxxxxxx
<http://us.mc395.mail.yahoo.com/mc/compose?to=49EF5161.2020405@xxxxxxxxxxxxxxxxx>>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Folks,
Recently, there was a message thread titled "Remote service with
ActiveMQ JMS topic using RFC 119 transparent way. " and in this
message
[0], I described some work I'm doing with the ECF RFC 119 impl to
easily
deal with these cases (i.e. option 2 in my message). By 'these
cases' I
mean publish and subscribe groups that are used for remote services
between members of those groups (e.g. JMS groups, etc).
Currently, there's no direct support in RFC119 for remote services
within pubsub groups...because although RFC119 has the notion of an
'endpoint ID', this endpoint ID gives the location of the remote
service's host...which assumes that the host is a server (i.e. can be
reached *directly* from a client), rather than indirectly (i.e. via a
pub/sub group).
ECF's IContainer can represent communication with either an endpoint
(server) *or* a pubsub group and this makes it possible to use this
capability to support peer-to-peer remote services within a pub-sub
group (e.g. a jms topic).
In order to make this capability accessible via the ECF RFC119 impl
(please add to your thoughts about giving a name to ECF's impl
here [1])
, I've added some API to our RFC119 implementation in
org.eclipse.ecf.osgi.services.distribution. What it does is
expose both
the *endpointID* and the *connectTargetID* in the discovery-published
meta-data (i.e. see this interface [2]). On the client side, this
information about the remote service (both it's endpointID and
connectTargetID) can then be used to connect to a pub/sub group at
remote service discovery time (but only when the connectTargetID is
non-null...note that this has *no* effect/relevance for client-server
distribution providers).
I've implemented the mechanism to do this, and am working on some
test
code using the ActiveMQ (JMS) provider. If others are interested in
helping test this, please let me know.
One more thing...in this previous thread [3] I brought up the
issue of
dealing with the situation where potentially many remote services
were
published/available on a lan (e.g.) and it was unclear (from
RFC119) how
this should be handled...e.g. does the announcement of some remote
service mean that another remote service doesn't get a proxy? Should
all remote service discoveries lead to proxy creation? How can an
application provide some control/scope to the proxy creation?
RFC119 doesn't really address this situation yet, but I've added two
service interface called IProxyContainerFinder, and
IHostContainerFinder
[4] that allows other bundles to register themselves as 'container
finders'...i.e. to decide which (of potentially many) remote services
providers should handle a discovered service publication. Note that
these container finders allow full customization of the remote
service
discovered meta-data (i.e. they can decide to create new IContainers,
reuse old ones, ignore some, etc). The way to replace the
DefaultProxyContainerFinder is to simply register your own
implementation of IProxyContainerFinder (or IHostContainerFinder)
as an
OSGi service...e.g:
bundleContext.registerService(IProxyContainerFinder.class.getName(),new
MyProxyContainerFinder(), null);
And when services are discovered via the discovery impl(s) your
container finder will be consulted to make the decision about what
IContainer should/will handle the request. Note that currently the
service with the highest service ranking will be selected (if
there are
many), and the DefaultProxyContainerFinder has the lowest service
ranking possible (so will only be used if *no* other container
finders
are registered in the service registry).
Note that there is also a IHostContainerFinder, to allow the same
sort
of customization for selection of the IContainers to handle the host
service publication (with the default being all existing IContainers).
Any comments welcomed. I'm working on testing/debugging this API
right
now (it already works fine with the r-OSGi and ecf generic providers
(i.e. in org.eclipse.ecf.tests.osgi.services.distribution), but I
want
to verify the correct behavior for ActiveMQ provider also, as above).
To summarize, the two API additions are:
1) IServiceEndpointDescription including both endpointID and
connectTargetID
2) Adding IProxy/HostContainerFinder API to allow for
customization/extension of the default container selection
mechanism for
both host and proxy handling.
Thanks,
Scott
[0] http://dev.eclipse.org/mhonarc/lists/ecf-dev/msg02265.html
[1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=270652
[2]
http://www.eclipse.org/ecf/org.eclipse.ecf.docs/api/org/eclipse/ecf/osgi/services/discovery/IServiceEndpointDescription.html
[3] http://dev.eclipse.org/mhonarc/lists/ecf-dev/msg02206.html
[4]
http://www.eclipse.org/ecf/org.eclipse.ecf.docs/api/org/eclipse/ecf/osgi/services/distribution/package-summary.html
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