public Serializer getDefaultSerializer()

in dubbo-serialization-extensions/dubbo-serialization-kryo/src/main/java/org/apache/dubbo/common/serialize/kryo/CompatibleKryo.java [32:53]

• 12 lines of code
• 7 McCabe index (conditional complexity)

    public Serializer getDefaultSerializer(Class type) {
        if (type == null) {
            throw new IllegalArgumentException("type cannot be null.");
        }

        /**
         * Kryo requires every class to provide a zero argument constructor. For any class does not match this condition, kryo have two ways:
         * 1. Use JavaSerializer,
         * 2. Set 'kryo.setInstantiatorStrategy(new DefaultInstantiatorStrategy(new StdInstantiatorStrategy()));', StdInstantiatorStrategy can generate an instance bypassing the constructor.
         *
         * In practice, it's not possible for Dubbo users to register kryo Serializer for every customized class. So in most cases, customized classes with/without zero argument constructor will
         * default to the default serializer.
         * It is the responsibility of kryo to handle with every standard jdk classes, so we will just escape these classes.
         */
        if (!Utils.isJdk(type) && !type.isArray() && !type.isEnum() && !Utils.checkZeroArgConstructor(type)) {
            if (logger.isWarnEnabled()) {
                logger.warn(type + " has no zero-arg constructor and this will affect the serialization performance");
            }
            return new JavaSerializer();
        }
        return super.getDefaultSerializer(type);
    }