It should be possible, after all its just about updating a liferay entity.
If you can get hold of AssetEntryService
then you can call the method incrementViewCounter
which would increment the view counter by 1.
So in your template you would have code like this:
#set ($assetEntryService = $serviceLocator.findService('com.liferay.portlet.asset.service.AssetEntryService'))
$assetEntryService.incrementViewCounter(String className, long classPK)
If you want to specify the increment value instead of the default 1, then you would require the instance of AssetEntryLocalService
as follows:
#set ($assetEntryLocalService = $serviceLocator.findService('com.liferay.portlet.asset.service.AssetEntryLocalService'))
$assetEntryService.incrementViewCounter(long userId, String className, long classPK, long increment)
increment
= to increment the current viewCount
by this value.
I hope I have understood what was required.