protected boolean isSessionStorageEnabled(Subject subject) {
        return getSessionStorageEvaluator().isSessionStorageEnabled(subject);
    }
Determines if the subject's session will be used to persist subject state or not.  This implementation
merely delegates to the internal {@link SessionStorageEvaluator} (a
{@code DefaultSessionStorageEvaluator} by default).

@param subject the subject to inspect to determine if the subject's session will be used to persist subject
               state or not.
@return {@code true} if the subject's session will be used to persist subject state, {@code false} otherwise.
@see #setSessionStorageEvaluator(SessionStorageEvaluator)
@see DefaultSessionStorageEvaluator
core/src/main/java/org/apache/shiro/mgt/DefaultSubjectDAO.java