Returns the {@code AuthenticationStrategy} utilized by this modular authenticator during a multi-realm
log-in attempt. This object is only used when two or more Realms are configured.
<p/>
Unless overridden by
the {@link #setAuthenticationStrategy(AuthenticationStrategy)} method, the default implementation
is the {@link hunt.shiro.authc.pam.AtLeastOneSuccessfulStrategy}.
@return the {@code AuthenticationStrategy} utilized by this modular authenticator during a log-in attempt.
Returns the {@code AuthenticationStrategy} utilized by this modular authenticator during a multi-realm log-in attempt. This object is only used when two or more Realms are configured. <p/> Unless overridden by the {@link #setAuthenticationStrategy(AuthenticationStrategy)} method, the default implementation is the {@link hunt.shiro.authc.pam.AtLeastOneSuccessfulStrategy}.
@return the {@code AuthenticationStrategy} utilized by this modular authenticator during a log-in attempt.