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From "angela (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1821) jcr2spi: Item.isSame may return wrong result if any ancestor is invalidated
Date Mon, 20 Oct 2008 09:50:44 GMT

    [ https://issues.apache.org/jira/browse/JCR-1821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640964#action_12640964

angela commented on JCR-1821:

from my point of view it would be worth evaluating 4) and check it's feasibility but not as
part of this issue since it affects the SPI interfaces and would cause additional changes
in jcr2spi.

> jcr2spi: Item.isSame may return wrong result if any ancestor is invalidated
> ---------------------------------------------------------------------------
>                 Key: JCR-1821
>                 URL: https://issues.apache.org/jira/browse/JCR-1821
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: jackrabbit-jcr2spi
>            Reporter: angela
>            Assignee: angela
>             Fix For: 1.5.0
> julian detected an issue with jcr2spi that was previously shadowed due to heavy reloading
of items upon save.
> with the most recent changes however reloading of items is postponed until the next access.
this will cause the following test to fail:
>         Node n = testRootNode.addNode("aFile", "nt:file");
>         n = n.addNode("jcr:content", "nt:resource");
>         n.setProperty("jcr:lastModified", Calendar.getInstance());
>         n.setProperty("jcr:mimeType", "text/plain");
>         Property jcrData = n.setProperty("jcr:data", "abc", PropertyType.BINARY);
>         testRootNode.save();
>         // access same property through different session
>         Session otherSession = helper.getReadOnlySession();
>         try {
>             Property otherProperty = (Property) otherSession.getItem(jcrData.getPath());
>             assertTrue(jcrData.isSame(otherProperty));
>         } finally {
>             otherSession.logout();
>         }
> while 
>        assertTrue(n.isSame(otherSession.getItem(n.getPath()));
> would be successful.
> the reason: the jcrData property is not reloaded and it's parent is still _invalidated_.
consequently the property isn't aware of it's id having changed due to the fact that nt:resource
is a node type extending from mix:referenceable.
> possible fixes:
> 1) mark all items _invalid_ after save 
>     instead of setting status non-protected/autocreated properties to EXISTING.
>     -> forcing jcrData to be reloaded before isSame can be called.
>     -> drawback: much more round trip(s) to the server just to make sure the id is
up to date.
> 2) change Item#isSame to make sure the workspaceId is up to date (walking up the
>      hierarchy and force reloading of the first invalidated ancestor).
>      -> drawback: if referenceable nodes are rare or missing at all, this causes some
>           extra round trips.
> 3) change Item.isSame to compare the 'workspacePath' instead of the 'workspaceId'.
>      -> drawback: upon persisted move of a referenceable node Item#isSame will return
> after taking a closer look at the code and at some additional tests i would opt for 2).

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