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<td class="page-title-pattern-first-line " style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://issues.shibboleth.net/jira/browse/OSJ" style="color: #3b73af; text-decoration: none">OpenSAML - Java</a> / <a href="https://issues.shibboleth.net/jira/browse/OSJ-253" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-92a48f0e-aae9-42bd-a588-0d7d9677adfd" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://issues.shibboleth.net/jira/browse/OSJ-253" style="color: #3b73af; text-decoration: none">OSJ-253</a> </td>
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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://issues.shibboleth.net/jira/browse/OSJ-253" style="color: #3b73af; text-decoration: none">Locking for concurrent equivalent non-EntityID criteria in dynamic metadata resolvers</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Issue Type:</th>
<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-92a48f0e-aae9-42bd-a588-0d7d9677adfd" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="putmanb@shibboleth.net" id="email_putmanb@shibboleth.net" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=putmanb%40shibboleth.net" style="color:#0052cc;; color: #3b73af; text-decoration: none">Brent Putman</a> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 01/Oct/18 6:23 PM </td>
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<td class="has-icon" style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-b4f6b03a-768d-4516-b199-c06dccd99840" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="putmanb@shibboleth.net" id="email_putmanb@shibboleth.net" href="https://issues.shibboleth.net/jira/secure/ViewProfile.jspa?name=putmanb%40shibboleth.net" style="color:#0052cc;; color: #3b73af; text-decoration: none">Brent Putman</a> </td>
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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-top:0;margin-bottom:10px;; margin: 10px 0 0 0; margin-top: 0">This is a follow-on to the work in <a href="https://issues.shibboleth.net/jira/browse/OSJ-181" title="Enhance dynamic metadata resolvers to support non-entityID criteria" class="issue-link" data-issue-key="OSJ-181" style="color: #3b73af; text-decoration: none">OSJ-181</a>, an optimization for avoiding concurrent fetches based on non-entityID criteria.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">We can't literally prevent concurrent fetches for ultimately the same metadata for any and all possible criteria. However, we can detect concurrent fetches for criteria set that is equivalent to another set in terms of the relevant lookup criteria data.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0 0">Working idea:</p>
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<li>filter criteria to remove predicates, leaving only potential "lookup criteria"</li>
<li>canonicalize by putting into ordered list</li>
<li>for each extract a unique value, producing a new ordered list</li>
<li>produce a unique lock for this list data</li>
<li>execute the fetch under this lock, first re-checking to see if the criteria now resolves to a unique entityID (i.e. another thread has already fetched and populated)</li>
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