Hi all,
I would like to share my thoughts on what I am currently working on with the
hope to get some input to have it done 100% Ofbiz style. Maybe this feature
could be interesting for the project:
Goal: resize uploaded images to predefined scales (Content Management)
File representation:
Original ../ofbiz/runtime/uploads/11111111/10001.jpeg
Small ../ofbiz/runtime/uploads/11111111/SMALL/10001.jpeg
...
Reason: improve load time of page by reducing image size
How to:
Config:
- Define scales
- Turn feature on & off.
Create Service "createScalesFromUploadedImage" and add code to do the resize
job.
Insert service in:
.. applications\content\servicedef
<service name="createContentFromUploadedFile" engine="group"
transaction-timeout="300">
<description>Accepts file upload, creates DataResource and Content
records.</description>
<!-- uses createContent internally; additonal permission(s) not
necessary -->
<group>
<invoke name="createDataResource" parameters="preserve"
result-to-context="true"/>
<invoke name="attachUploadToDataResource" parameters="preserve"
result-to-context="true"/>
<invoke name="createContentFromDataResource" parameters="preserve"
result-to-context="true"/>
<invoke name="createScalesFromUploadedImage"/>
</group>
</service>
<service name="updateContentAndUploadedFile" engine="group"
transaction-timeout="300">
<description>Accepts file upload, updates DataResource and Content
records.</description>
<group>
<invoke name="updateDataResource" parameters="preserve"
result-to-context="true"/>
<invoke name="attachUploadToDataResource" parameters="preserve"
result-to-context="true"/>
<invoke name="updateContent" parameters="preserve"
result-to-context="true"/>
<invoke name="createScalesFromUploadedImage"/>
</group>
</service>
This works already using CMS. Creating an image by using "create content" seems
to call different methods to upload the image. I still have to check why.
Adding an "ImageWorker" class to access the scaled images with methods like "
getImageScaleFromDataResource, getImageScaleFromContent ". I do not thing they
should be added to the database as dataresources as they are just another
representation of the original image. If the image scale is not available it
will be created on fly. If the original image is there, there is no reason to
result in 404. Service to scale the image is called when
- uploading,
- updating,
- retrieved and file is not available.
Workflow to stream the image:
Call stream like: "stream?contentId=10001?scale=small"
"stream" --> DataEvents.serveObjectData
Add:
String imageScale = (String) httpParams.get("scale");
.
.
resourceData = ImageWorker. getImageScaleFromDataResource (dataResource, https,
webSiteId, locale, contextRoot, scale, false);
Then the image gets streamed.
I would appreciate any thoughts.
Ingo
