[QUESTION] Thread-safety and analogues of jackson features

[blonded04]

Questions

Hello, I'm struggling with documentation in Chinese language, please help.

I'm trying to migrate from jackson to fastjson2, and I'm stuck with a few questions I can't find answers to:

1. Can you please tell me, whether fastjson2 is threadsafe (may I serialize different objects from different thrads via JSON / JSONObject static methods?), and if it's not, how can I achieve thread-safety?
2. I'm trying to migrate from jackson to fastjson2. Are there (if any) direct equivalents of the following functions from jackson in fastjson2:

• jackson's ObjectReader.readerForUpdating(b): where I provide a builder, and then parse new json's values with respect to values already present in that builder
• jackson's JsonNode: I'd like to have something like JSONObject, which might be either JSONArray or JSONObject, but I can't find a way to differ one from another, like, if I just have a String and I want to get either a single JSONObject or an array of JSONObjects

[wenshao]

Thank you for choosing fastjson2, I hope it helps you.

1. The static methods provided by the JSON class are thread-safe, you don't have to worry about that.

2. Do you think this is what you want?

public class Int1 {
    public int v0000;
}

String str = "{\"v0000\":101}";
Int1 vo = new Int1();
JSONReader jsonReader = JSONReader.of(str);
jsonReader.readObject(vo);
assertEquals(101, vo.getV0000());

[blonded04]

Thank you for choosing fastjson2, I hope it helps you.

1. The static methods provided by the JSON class are thread-safe, you don't have to worry about that.
2. Do you think this is what you want?

public class Int1 {
    public int v0000;
}

String str = "{\"v0000\":101}";
Int1 vo = new Int1();
JSONReader jsonReader = JSONReader.of(str);
jsonReader.readObject(vo);
assertEquals(101, vo.getV0000());

Thank you for your quick answer!

1. Great!
2. Is it true, that str may not have all the fields of Int1? May it have only REQUIRED or even a subset of REQUIRED fields? Also I really need some kind of common interface between JSONArray and JSONObject to dynamically decide whether underlying JSO is an array or a simple object

[wenshao]

str may not include any Int1 fields. If there are extra fields, they will be ignored. If you want to process extra fields, you can configure ExtraProcessor, for example:

        String str = "{\"v0000\":101,\"name\":\"xx\"}";
        Int1 vo = new Int1();
        JSONReader.Context context = JSONFactory.createReadContext();
        context.setExtraProcessor(((object, key, value) -> {
            // process extra fields
        }));
        JSONReader jsonReader = JSONReader.of(str, context);
        jsonReader.readObject(vo);
        assertEquals(101, vo.getV0000());

JSONObject and JSONArray have no common interface.