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Re: [ecf-dev] multiple service call
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Hi Abhisek,
abhisek saikia wrote:
Hi All
I was trying to have a load balancer using ECF.I am using ECF with
ECF generic.my provider is distributed across multiple machines.And i
want my consumer to pick any of the provider based on round robin and
make the service call..How can i do this?Does ECF have support for this?
The JMS/ActiveMQ has support for what you are describing (i.e. round
robin service call handling), by using the semantics of the JMS Queue.
This is described w/src code here:
http://wiki.eclipse.org/Load_Balancing_Remote_Services
None of this logic is part of OSGi 4.2 remote services, however, so it's
all specific to individual ECF providers. Currently, there is *not*
support for the round robin choosing/making service call in the ECF
generic provider. It could be added, but it would be a new feature for
that provider...essentially duplicating the JMS/ActiveMQ Queue semantics
(multiple consumers...i.e. service impls...attached to a single
producer...i.e. service consumer/client). As of right now, the
JMS/ActiveMQ provider is the only one that supports this behavior.
A thing to be clear about, however, is that almost *all* of the ActiveMQ
provider impl is actually in an abstract plugin:
org.eclipse.ecf.provider.jms...which just uses the JMS spec. There is
very little code that is ActiveMQ-specific. So in good OSGi fashion :),
it's very close to a trivial matter to reuse this abstract plugin to
create providers based upon other JMS implementations, if desired.
Scott
