public void setSingleUse(boolean singleUse) {
        this.singleUse = singleUse;
    }
Sets whether this user data is intended for single-use only. Single-use
data cannot be used more than once. This flag only has meaning if the
data also has an expires timestamp. By default, user data is NOT
single-use.

@param singleUse
    true if this data is intended for single-use only, false
    otherwise.
extensions/guacamole-auth-json/src/main/java/org/apache/guacamole/auth/json/user/UserData.java