Tuesday, August 27, 2013

Re: JSON object to AutoBean via JSNI in DevMode

On Tuesday, August 27, 2013 10:21:28 AM UTC+2, Jens wrote:

is there anything faster than

final String payload = new JSONObject(jsonDataFromJSNI).toString();
dataBean = AutoBeanCodex.decode(factory, Data.class, payload);

when in DevMode? The JSON data is embedded into the host page and not that tiny (worst case ~600kb uncompressed) and the above solution makes DevMode hang for about 3-5 seconds when refreshing the site. Thats kind of annoying and I just want to make sure I didn't miss a different solution for DevMode thats maybe faster.

Use native JSON.stringify through JSNI?
The problem with com.google.gwt.json is that it creates a lot of objects and uses a lot of JSNI which slows down DevMode.

If you don't mind running a patched GWT, there are a few issues that need to be fixed (most of them have pending reviews):
  • Elemental JSON can't be used without bringing the whole Elemental (which breaks DevMode): https://gwt-review.googlesource.com/4210
  • Some of Elemental JSON is broken in prod mode (OK, not really relevant here): https://gwt-review.googlesource.com/4050
  • Some of Elemental JSON is broken in dev mode: https://code.google.com/p/google-web-toolkit/issues/detail?id=7484 (partly fixed by above review)
Once that's fixed, you could then use: payload = ((JsJsonValue) jsonDataFromJSNI).toJson(); (note: uses JSON.stringify under-the-hood)

The next step will be to "port" AutoBean to use elemental.json instead of org.json and add an overload to AutoBeanCodex.decode that takes a JsonValue.

(side note: the data you get from the page is JS, not JSON; JSON is a serialization format, if you have objects, then it's JS, possibly expressed as JS literals; this is one reason why JSON-P is completely misnamed: there's no JSON in JSON-P, at all)

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