Hi Clement,
Clement Escoffier wrote:
Hi,
On 04.05.2009, at 15:14, André Lage wrote:
Hello,
I am a new iPOJO/Felix user and I am using it to implement a simple
case study. Let's suppose that there are 10 providers (called provider
#1, provider #2, ..., provider #10) that offer the same service, each
one is a bundle composed by one component. The consumer (another
bundle composed by a single component) can *only* "trust" in two of
them, provider #1 and provider #2. So it only accepts them as providers.
I read in [1] that I can target a specific provider by using the
*from* attribute as follows:
<component classname="...HelloConsumer">
<requires from="MyHelloProvider">
<callback type="bind" method="bindHello">
<callback type="unbind" method="unbindHello">
</requires>
...
</component>
However, I need to target *either* the provider #1 *or* the provider
#2. I did it by filtering the provider writing a method in the POJO
code, but I would like to let the handler addresses it for me. So here
are my questions:
1) How could I do it by just modifying/tuning my metadata.xml file
(i.e., by letting the handler addresses it for me)?
2) If it is possible, could I also specify something like to target
*both* the provider #1 *and* the provider #2?
You can filter the providers. Imagine that the provider have a service
property indicating their names.
Your metadata will be:
<requires
filter="(|(provider.name=provider#1)(provider.name=provider#2))"
aggregate="true">
<callback type="bind" method="bindHello">
<callback type="unbind" method="unbindHello">
</requires>
If you specify instance names like in
<instance component"..." name="provider#1"/>
So, iPOJO registers a service property for you ("instance.name"), so
your service dependency will look like:
<requires
filter="(|(instance.name=provider#1)(instance.name=provider#2))"
aggregate="true">
<callback type="bind" method="bindHello">
<callback type="unbind" method="unbindHello">
</requires>
It perfectly worked, thanks!
In this case, I realized that the consumer is satisfied if at least
*one* of these two providers is available. I would like also to tune
another service consumer in such a manner that it needs *both* providers
#1 and #2 available. Is it possible?
--
André Lage Freitas
Regards,
Clement
Thank you in advance,
--
André Lage Freitas
[1]
http://felix.apache.org/site/service-requirement-handler.html#ServiceRequirementHandler-Targetingaspecificprovider
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