Is there a message to be listen to when editor enter play mode?

$$anonymous$$, Im trying to detect the event on editor window when unity editor enter play mode. I need t$$anonymous$$s because everytime you enter play mode, unity destroy all the scriptableobject that i created, and i want to save t$$anonymous$$s objects to asset then recover them. I try the OnDestroy() but t$$anonymous$$s message only be received when i close the editor window. What I am doing now is save objects manually before enter the playmode and when the object reference == null, i reload them from asset. w$$anonymous$$ch is kind of lame.