``` inner class DriverSessionIDContainer { ...
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inner class DriverSessionIDContainer {

        protected var THREAD_SESSION_ID: MutableMap<Long, String> = ConcurrentHashMap(4)

        var driverSessionID: String
            get() = THREAD_SESSION_ID.getValue(currentThread().id)
            set(session) {
                THREAD_SESSION_ID.put(currentThread().id, session)
            }
    }