java - How to execute logic on Optional if not present? -

i want replace following code using java8 optional:

public obj getobjectfromdb() {     obj obj = dao.find();     if (obj != null) {         obj.setavailable(true);     } else {         logger.fatal("object not available");     }      return obj; } 

the following pseudocode not work there no orelserun method, anyways illustrates purpose:

public optional<obj> getobjectfromdb() {     optional<obj> obj = dao.find();     return obj.ifpresent(obj.setavailable(true)).orelserun(logger.fatal("object not available")); } 

i don't think can in single statement. better do:

if (!obj.ispresent()) {     logger.fatal(...);    } else {     obj.get().setavailable(true); } return obj;