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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">This is functionally not very hard. It's essentially the same code as in the internal <tt>BackingStoreCleanupSweeper#removeExpiredAndIdleMetadata()</tt>, except that it would clear the data for all entityIDs unconditionally instead of based on last accessed time.</p> <p style="margin: 10px 0 0 0">There are some quirks and questions with doing this via the existing API however (<tt>RefreshableMetadataResolver#refresh())</tt>. First, to me it's questionable whether the definition of "refresh" as defined there (which was driven by the batch case obviously) means the same thing as dynamic provider "dump the cache". "Refresh" on a dynamic provider could also mean "actively go and attempt to fetch updated data for all the entities you currently know about". Similar for a hypothetical future <tt>refresh(String entityID)</tt> method.</p> <p style="margin: 10px 0 0 0">Next, on that interface (and also the subinterface <tt>ExtendedRefreshableMetadataResolver</tt> which we will merge back in and eliminate in 4.0, see <a href="https://issues.shibboleth.net/jira/browse/OSJ-206" title="Promote new public methods to MetadataResolver subinterfaces" class="issue-link" data-issue-key="OSJ-206" style="color: #3b73af; text-decoration: none">OSJ-206</a>), there are several informational methods (mostly for the metrics stuff) which sort of don't make sense in the dynamic case. They're all @Nullable, so I guess we could return null, but it's a wart-y conceptual mismatch when you don't implement part of interface because it doesn't apply.</p> <p style="margin: 10px 0 0 0">Finally if in 4.0 we did want to add a new <tt>refresh(String entityID)</tt> type of method, that certainly wouldn't fit on the existing <tt>RefreshableMetadataResolver</tt> interface since that doesn't make sense for the batch resolvers which currently implement that interface.</p> <p style="margin: 10px 0 0 0">So, if I was going to do this without regard for other things, I'd probably add a new interface that was more focused on the dynamic case, with a method like <tt>clearCache()</tt> or something. Or just add to the existing <tt>DynamicMetadataResolver</tt> marker interface.</p> <p style="margin: 10px 0 0 0">But... presumably the whole point of implementing <tt>RefreshableMetadataResolver</tt> here would be that we have lots of existing code in the IdP that already understands how to check/cast and call <tt>refresh()</tt>, and if we did something different here then we'd have to modify stuff all over the place to account for the new interface.</p> <p style="margin: 10px 0 0 0">So if we want to do this now via <tt>RefreshableMetadataResolver</tt> for expedient reasons, then I guess we can. But we would then likely need to revisit all of this and do some significant refactoring for 4.0.</p> <p style="margin: 10px 0 0 0">Thoughts for or against?</p> <p style="margin: 10px 0 0 0"> </p> </td>
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