public void setSecurityManagerName(String securityManagerName) {
        this.securityManagerName = securityManagerName;
    }
Sets the name of the {@link SecurityManager} instance in the backing map.  Used as a key to lookup the
instance.  Unless set otherwise, the default is {@code securityManager}.

@param securityManagerName the name of the {@link SecurityManager} instance in the backing map.  Used as a key
                           to lookup the instance.
core/src/main/java/org/apache/shiro/env/DefaultEnvironment.java