how to call Property change listener of an asset .

[djohn98390536]

I have an requirement like whenever a property called "dxmlLastCreatedVersion" of an asset  is getting changed a listener should listen the event .I am using the below code kindly hv a look and let me know is this the correct way get an event for a node property change. It is working for all property change under /content/dam/sample this path ,but it should work only specific property change.

@component(immediate = true,

        service = ResourceChangeListener.class,

        property = {

                ResourceChangeListener.PATHS + "=" + "/content/dam/sample",

                ResourceChangeListener.CHANGES + "=" + "CHANGED",

                ResourceChangeListener.PROPERTY_NAMES_HINT + "=dxmlLastCreatedVersion"

        })

public class PropertyChangeListener implements ResourceChangeListener {

    private static final Logger LOG = LoggerFactory.getLogger(PropertyChangeListener.class);

 @reference

    private ResourceResolverService rr;

@Override

    public void onChange(List<ResourceChange> lists) {

ResourceResolver resourceResolver = null;

try {

resourceResolver = rr.getResourceResolver();

for (ResourceChange resourceChange : lists) {

String resourcepath = resourceChange.getPath();

LOG.info("******* RESOURCE PATH *******"+ resourcepath);

Resource resource = resourceResolver.getResource(resourcepath);

LOG.info("******* RESOURCE NAME *******"+ resource.getName());

}

} catch (LoginException e) {

e.printStackTrace();

} 

   }

}

[DivrajSingh · Accepted solution]

@djohn98390536 : To answer "how can you trigger a process when a property of an asset is updated", my inputs below:

• You can setup a workflow launcher where you can configure the property on which a listener should be setup and call your custom process on change/delete events. [read more about Workflow launcher]
• A similar question is answered on this forum post

However, what customization are you planning to implement on change of property jcr:content/dxmlLastCreatedVersion?

[aanchal-sikka]

Please refer to the reply on https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/query-on-resourcechangelis... 

They have been able to resolve this.

However, I have not found "PROPERTY_NAMES_HINT" on multiple implementations. Even the documentation suggests.

"This is only a hint, a change listener registering with this property must be prepared that the underlying implementation is not able to filter based on this property."

Ref: https://developer.adobe.com/experience-manager/reference-materials/6-5/javadoc/org/apache/sling/api/...