private static Constructor getConstructorOfInetAddress$CachedAddresses()

in library/src/main/java/com/alibaba/dcm/internal/InetAddressCacheUtilForNew.java [74:106]

16 lines of code
4 McCabe index (conditional complexity)


    private static Constructor<?> getConstructorOfInetAddress$CachedAddresses() throws ClassNotFoundException {
        if (constructorOfInetAddress$CachedAddresses != null) return constructorOfInetAddress$CachedAddresses;

        synchronized (InetAddressCacheUtilCommons.class) {
            // double check
            if (constructorOfInetAddress$CachedAddresses != null) return constructorOfInetAddress$CachedAddresses;

            Class<?> clazz;

            try {
                clazz = Class.forName(inetAddress$CachedAddresses_ClassName);
            } catch (ClassNotFoundException e) {
                // jdk 21 support
                // due to https://github.com/openjdk/jdk/commit/8b127262a3dff9c4420945e902f6a688f8d05e2e
                clazz = Class.forName(inetAddress$CachedLookup_ClassName);
            }

            // InetAddress.CacheEntry has only one constructor:
            //
            // - for jdk 9-jdk12, constructor signature is CachedAddresses(String host, InetAddress[] inetAddresses, long expiryTime)
            // code in jdk 9:
            //   https://hg.openjdk.java.net/jdk9/jdk9/jdk/file/65464a307408/src/java.base/share/classes/java/net/InetAddress.java#l783
            // code in jdk 11:
            //   https://hg.openjdk.java.net/jdk/jdk11/file/1ddf9a99e4ad/src/java.base/share/classes/java/net/InetAddress.java#l787
            // code in jdk 21:
            //   https://github.com/openjdk/jdk/blob/jdk-21-ga/src/java.base/share/classes/java/net/InetAddress.java#L979
            final Constructor<?> constructor = clazz.getDeclaredConstructors()[0];
            constructor.setAccessible(true);

            constructorOfInetAddress$CachedAddresses = constructor;
            return constructor;
        }
    }