class TestClass : AutoCloseable {

    @Volatile
    private var isClosed = false

    var listener: (() -> Unit)? = null
        set(value) {
            if (isClosed && (value != null)) {
                throw IllegalStateException("Object shouldn't be used anymore because it is closed")
            }
            field = value
        }

    override fun close() {
        isClosed = true
        listener = null
    }
}