topic Current method for adding a rendition definition for the thumbnail service? in Alfresco Archive

Current method for adding a rendition definition for the thumbnail service?

oofdachile — Wed, 30 Oct 2013 15:13:58 GMT

Hi, folks – I would like to add an ImageMagick thumbnail rendition definition for use by the 4.2e Community thumbnail service. Jeff wrote a <a href="http://ecmarchitect.com/archives/2009/03/03/913" target="_blank">thorough article</a> on the subject (thanks, Jeff!). He observed that a

Re: Current method for adding a rendition definition for the thumbnail service?

arnoldschrijve1 — Tue, 05 Nov 2013 16:13:22 GMT

Hi,

I don't know about the script part, but the trick with the MethodInvokingFactory bean worked quite well….registered a new thumbnail this way, then afterwards triggering the rendition in Java code, something more or less like this:

<java>
        QName thumbnailRenditionName = QName.createQName(
                NamespaceService.CONTENT_MODEL_1_0_URI, "assetThumbnail");

        // Trigger the renditionService to create Thumbnail image.
        RenditionDefinition assetThumbnailRendition =
                serviceRegistry.getRenditionService().loadRenditionDefinition(
                        thumbnailRenditionName);

            serviceRegistry.getRenditionService().render(
                    getNodeRef(), assetThumbnailRendition , new RenderCallback()
            {
                public void handleFailedRendition(Throwable t)
                {
                    // In the event of a failed (re-)rendition, delete the rendition node
                    if (logger.isDebugEnabled())
                    {
                        logger.debug("Stuff went wrong", t);
                    }
                }

                public void handleSuccessfulRendition(
                        ChildAssociationRef primaryParentOfNewRendition)
                {
                    // Stuff went right
                }
            });
</java>

Re: Current method for adding a rendition definition for the thumbnail service?

oofdachile — Thu, 07 Nov 2013 15:28:44 GMT

Thanks for taking the time to reply, Arnold.

I'm glad this technique worked for you, though I still wonder what I'm doing wrong. This is my context file that tries to use this MethodInvokingFactory technique to define Jeff's thumbnail rendition in 4.2.e:


<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN' 'http://www.springframework.org/dtd/spring-beans.dtd'>
 
<beans>

   <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
      <property name="targetObject" ref="thumbnailRegistry"/>
      <property name="targetMethod" value="addThumbnailDefinition"/>
      <property name="arguments">
         <list>
            <bean class="org.alfresco.repo.thumbnail.ThumbnailDefinition">
               <property name="name" value="scImageThumbnail"/>
               <property name="mimetype" value="image/png"/>
               <property name="transformationOptions">
                  <bean class="org.alfresco.repo.content.transform.magick.ImageTransformationOptions">
                     <property name="resizeOptions">
                        <bean class="org.alfresco.repo.content.transform.magick.ImageResizeOptions">
                           <property name="height" value="100"/>
                           <property name="maintainAspectRatio" value="true"/>
                           <property name="resizeToThumbnail" value="true"/>
                        </bean>
                     </property>
                  </bean>
               </property>
               <property name="placeHolderResourcePath" value="alfresco/thumbnail/thumbnail_placeholder_medium.jpg"/>
            </bean>
         </list>
      </property>
   </bean>

</beans>
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Do you, or does anyone else who has a minute to look) see anything wrong with my context file, or using a context file for this purpose? Would you share your context file & let us know which Alfresco Community version you're running, please?

I dug into the system's context file that defines the OOTB renditions, and found an enticing comment in front of all of the renditions there. Here's the one for the 64x64 Avatar rendition:


<!– User avatar 64x64 image thumbnail options –>
<!– Note that this will auto-register with parent="baseThumbnailDefinition" in the future –>
‍‍‍‍

Has anyone heard about this technique? Does anyone know when it will be implemented (or, I guess, whether it has already been implemented, as I haven't tried it yet)?

Thanks!

Don

Re: Current method for adding a rendition definition for the thumbnail service?

arnoldschrijve1 — Thu, 07 Nov 2013 17:59:11 GMT

Hi,

Looking at your context, it looks pretty good. Except in my definition I have an additional RunAs property and some failure options.
I am using Enterprise Edition at version 4.1.1.3, not Community Edition, but I don't think there are differences in thumbnailing codes between EE and CE.

Here's my bean declaration:


    <bean id="assetPreview" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
        <property name="targetObject" ref="thumbnailRegistry" />
        <property name="targetMethod" value="addThumbnailDefinition" />
        <property name="arguments">
            <list>
                 <!– Asset Preview - thumbnail options –>
                 <bean class="org.alfresco.repo.thumbnail.ThumbnailDefinition">
                    <property name="name" value="assetPreview" />
                    <property name="mimetype" value="image/png"/>
                    <property name="transformationOptions">
                       <bean class="org.alfresco.repo.content.transform.magick.ImageTransformationOptions">
                          <property name="resizeOptions">
                             <bean class="org.alfresco.repo.content.transform.magick.ImageResizeOptions">
                                <property name="width" value="600"/>
                                <property name="height" value="600"/>
                                <property name="maintainAspectRatio" value="true"/>
                                <property name="resizeToThumbnail" value="true" />
                                <property name="allowEnlargement" value="false" />
                             </bean>
                          </property>
                       </bean>
                    </property>
                    <property name="placeHolderResourcePath" value="alfresco/thumbnail/thumbnail_placeholder_imgpreview.png" />
                    <property name="runAs" value="System"/>
                    <property name="failureHandlingOptions" ref="standardFailureOptions"/>
                </bean>
            </list>
        </property>
    </bean>
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Re: Current method for adding a rendition definition for the thumbnail service?

oofdachile — Tue, 12 Nov 2013 01:40:00 GMT

Arnold, THANKS for sending your configuration. Along the way, I tried outright redefining the Thumbnail registry in an alfresco extension context, but couldn't make it work until I added a "width" property. I hoped that by providing both a "height" and a "preserve aspect ratio" property, the rendition would hold to a fixed height but variable width. But server startup errors complained about missing an "X" parameter. After a bit of digging, I confirmed that the X parameter in question is set by the "width" property. Sigh.

So I added the properties that your configuration had which mine did not, including a width, and now my MethodInvokingFactory configuration works just fine. Hooray!

Thanks again for your help!

Don

Re: Current method for adding a rendition definition for the thumbnail service?

arnoldschrijve1 — Tue, 12 Nov 2013 07:42:32 GMT

Cool, glad that it worked!!

Re: Current method for adding a rendition definition for the thumbnail service?

midouvich — Sat, 31 May 2014 17:19:00 GMT

je ne trouve pas les trois fichier :
mt-context.xml.sample
mt-admin-context.xml.sample
mt-contentstore-context.xml.sample

bien que je ne trouve pas le répertoire /opt/alfresco/tomcat/shared/classes/alfresco/extension/mt.

que je dois faire pour continuer l'activation de alfresco multi tenant ?

Merci d'avance