Method fieldOrder

src/com/sun/jna/Structure.java:1064–1085

Cache field order per-class. @return (cached) ordered list of fields

()

     * @return (cached) ordered list of fields
     */
    private List<String> fieldOrder() {
        Class<?> clazz = getClass();
        // Try to read the value under the read lock
        cacheStructureLock.readLock().lock();
        try {
            List<String> order = fieldOrder.get(clazz);
            if (order != null) {
                return order; // Return the cached result if found
            }
        } finally {
            cacheStructureLock.readLock().unlock();
        }

        // If not found, compute the value under the write lock
        cacheStructureLock.writeLock().lock();
        try {
            // Double-check if another thread has computed the value before we do (see JavaDoc)
            return fieldOrder.computeIfAbsent(clazz, (c) -> getFieldOrder());
        } finally {
            cacheStructureLock.writeLock().unlock();
        }
    }

    public static List<String> createFieldsOrder(List<String> baseFields, String ... extraFields) {
        return createFieldsOrder(baseFields, Arrays.asList(extraFields));