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Fix for ALF-5123. Do not cache thumbnail definitions when none have been (initially) found.

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git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@22941 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
This commit is contained in:
Neil McErlean
2010-10-07 09:57:20 +00:00
parent 0ab098088d
commit fc0cbe5ae8
1 changed files with 16 additions and 1 deletions
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17
source/java/org/alfresco/repo/thumbnail/ThumbnailRegistry.java
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@@ -181,6 +181,7 @@ public class ThumbnailRegistry implements ApplicationContextAware, ApplicationLi
if (result == null)
{
boolean foundAtLeastOneTransformer = false;
result = new ArrayList<ThumbnailDefinition>(7);
for (ThumbnailDefinition thumbnailDefinition : this.thumbnailDefinitions.values())
@@ -191,10 +192,24 @@ public class ThumbnailRegistry implements ApplicationContextAware, ApplicationLi
thumbnailDefinition.getTransformationOptions()) != null)
{
result.add(thumbnailDefinition);
foundAtLeastOneTransformer = true;
}
}
this.mimetypeMap.put(mimetype, result);
// If we have found no transformers for the given MIME type then we do
// not cache the empty list. We prevent this because we want to allow for
// transformers only coming online *during* system operation - as opposed
// to coming online during startup.
//
// An example of such a transient transformer would be those that use OpenOffice.org.
// It is possible that the system might start without OOo-based transformers
// being available. Therefore we must not cache an empty list for the relevant
// MIME types - otherwise this class would hide the fact that OOo (soffice) has
// been launched and that new transformers are available.
if (foundAtLeastOneTransformer)
{
this.mimetypeMap.put(mimetype, result);
}
}
return result;