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https://issues.apache.org/jira/browse/FELIX-2815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991249#comment-12991249
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Richard S. Hall commented on FELIX-2815:
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Well, I was doing it from memory. :-)
There are lot of concepts, so it is difficult to get everything organized
perfectly. In truth, iPOJO is probably our best documented subproject...thanks
to Clement! Still, everything can be improved.
Regarding @Provides, yes, you are correct, you must be explicit to say what, if
any, services a component provides. Just because a component implements an
interface, that doesn't mean that it is necessarily a service. However, the
default for @Provides is to assume all implemented interfaces are services, but
it also allows you to explicit specify which of the implemented interfaces
should be exposed as services.
> Difference between "instance" and "provides"
> --------------------------------------------
>
> Key: FELIX-2815
> URL: https://issues.apache.org/jira/browse/FELIX-2815
> Project: Felix
> Issue Type: Bug
> Components: iPOJO
> Reporter: Andriyko
> Assignee: Clement Escoffier
> Labels: documentation, felix,, ipojo
>
> In the documentation on iPOJO Services:
> http://felix.apache.org/site/providing-osgi-services.html#ProvidingOSGiservices-Instancereconfiguration
> There is no clear explanation of what is the difference between <provides>
> and <instance>.
> It is not clear why "instance" is needed at all.
> Under the "Service Properties" heading on the page, the two are used
> interchangeably in the examples.
> For example, first "property" is configured with <provides>:
> <component classname="...FooProviderType1">
> <provides>
> <property name="foo" field="m_foo" value="Foo"/>
> <property name="static" type="java.lang.String"
> value="this is a static property"/>
> </provides>
> </component>
> and then immediately, with no explanation what-so-ever and <intsance> is
> used, with a tiny explanation that "The value can be given in the instance
> configuration":
> <instance component="...FooProviderType1">
> <property name="foo" value="My New Foo Value"/>
> <property name="static" value="My Value For Static"/>
> </instance>
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