public static boolean registerThreadLocal()

in ttl-core/src/main/java/com/alibaba/ttl3/transmitter/ThreadLocalTransmitRegistry.java [101:115]

• 13 lines of code
• 4 McCabe index (conditional complexity)

    public static <T> boolean registerThreadLocal(@NonNull ThreadLocal<T> threadLocal, @NonNull UnaryOperator<T> generator, boolean force) {
        if (threadLocal instanceof TransmittableThreadLocal) {
            logger.warning("register a TransmittableThreadLocal instance, this is unnecessary!");
            return true;
        }

        synchronized (threadLocalHolderUpdateLock) {
            if (!force && threadLocalHolder.containsKey(threadLocal)) return false;

            WeakHashMap<ThreadLocal<Object>, UnaryOperator<Object>> newHolder = new WeakHashMap<>(threadLocalHolder);
            newHolder.put((ThreadLocal<Object>) threadLocal, (UnaryOperator<Object>) generator);
            threadLocalHolder = newHolder;
            return true;
        }
    }