Regarding MetadataProvider Interface in OpenSAMLv3

[Brent Putman]

On 7/4/16 2:53 AM, punit ashra wrote:
> Hi Dev Team,
>
> I am moving from OpenSAMLv2 to OpenSAMLv3, is there any implementation
> changes in MetadataProvider?

In general the v2 MetadataProvider functionality was split into 2 new
Resolver sub-interfaces: MetadataResolver (resolves EntityDescriptors)
and RoleDescriptorResolver (resolves RoleDescriptors).  The only
supplied impl of the latter just wraps an instance of the former.  The
MetadataResolver impls, aside from the name changes of -Provider to
-Resolver, pretty much look like the old v2 ones as far as what they do
and how they work (filesystem, HTTP, file-backed HTTP, etc).

As Resolvers, they take as input a CriteriaSet.  For MetadataResolvers
(in 3.2.0 at least) that should contain an EntityIdCriterion.  For
RoleDescriptorResolver, should contain a EntityIdCriterion,
EntityRoleCriterion, and optionally a ProtocolCriterion.

(FYI, there are some backward-compatible changes and new capabilties
coming there, already on the trunk and scheduled for 3.3.0).

> As i am not able to use it directly.

If you ask a more specific question, I can give you a more specific answer.
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