Determine runmode in Adobe CQ

Question

How do I programmatically know which run-mode the instance is running? I created a custom tag that provides the config depending on the instance run-mode, but I can not dete

Answer 1

As Bertrand Delacretaz said it is the right way to check whether instance is Author or Publish. In jsp or java you could check like

import  org.apache.sling.settings.SlingSettingsService
Set runModes = sling.getService(SlingSettingsService.class).getRunModes();

if (runModes.contains("author")) {
} 

Another way is using

if (mode == WCMMode.EDIT) 
{
}

But this approach will fail in case of Preview mode and wouldn't work.