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-----Original Message-----
From: "Chetan Mehrotra (JIRA)" <[email protected]>
Date: Fri, 19 Oct 2012 14:44:12
To: <[email protected]>
Reply-To: [email protected]
Subject: [jira] [Comment Edited] (SLING-2575) Utility for tracking a
multi-cardinality OSGi service reference
[
https://issues.apache.org/jira/browse/SLING-2575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480049#comment-13480049
]
Chetan Mehrotra edited comment on SLING-2575 at 10/19/12 2:44 PM:
------------------------------------------------------------------
Patch which adds a new getComparableForServiceRankingDesc method to
ServiceUtil. See gist [1] for a sample demonstrating its use
https://gist.github.com/3918574
was (Author: chetanm):
Patch which adds a new getComparableForServiceRankingDesc method to
ServiceUtil
> Utility for tracking a multi-cardinality OSGi service reference
> ---------------------------------------------------------------
>
> Key: SLING-2575
> URL: https://issues.apache.org/jira/browse/SLING-2575
> Project: Sling
> Issue Type: Improvement
> Components: Commons
> Reporter: Alexander Klimetschek
> Priority: Minor
> Attachments: SLING-2575-ServiceReferences.patch,
> SLING-2575-serviceutil-desc.patch
>
>
> Managing a SCR @Reference that's basically a list is very difficult when
> compared to the simple unary, static reference. It seems a typical use case
> is 0..n cardinality, dynamic policy and ordered by service ranking with the
> higher ranked ones first. This supports the use case to ask a list of
> services and have the first responding one win.
> There is the ServiceTracker [0], but its getServiceReferences() method does
> not return the list sorted in any way, only gives your references and not the
> typed object(s) and it's a bit cumbersome to use.
> A typical manual approach can be seen in the SlingPostServlet [1] in the
> register*() methods. Important is to handle thread-safeness.
> [0]
> http://www.osgi.org/javadoc/r4v42/org/osgi/util/tracker/ServiceTracker.html
> [1]
> http://svn.apache.org/repos/asf/sling/trunk/bundles/servlets/post/src/main/java/org/apache/sling/servlets/post/impl/SlingPostServlet.java
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