android: gson performance
android, gson, performance
Solution
I've seen questions like this come up before, and the general consensus is that Jackson is much faster than Gson. See the following links for more information:
- Jackson Vs. Gson
- Replace standard Android JSON parser for better performance?
- http://www.cowtowncoder.com/blog/archives/2009/12/entry_345.html
- https://stackoverflow.com/questions/338586/a-better-java-json-library
Here is one which specifically discusses Android: http://ubikapps.net/?p=525
Problem
I am trying to use gson to do my object mapping on the android emulator. It has been ridiculously slow when processing json data around 208 kb. I do not have any hierarchies in my json. After the object mapping is done, i can see it that gson created around 500 records. It is taking it over 3 minutes on the android emulator to map the input json. I have annotated my entity which comprises of strings and couple of floats. An I missing something? Any ideas, best practices would greatly help. Are there any ways of quickly object mapping the json data? ``` URL myURL = new URL(url); /* Open a connection to that URL. */ URLConnection ucon = myURL.openConnection(); /* * Define InputStreams to read from the URLConnection. */ InputStream is = ucon.getInputStream(); InputStreamReader reader = new InputStreamReader(is); long tickCount = System.currentTimeMillis(); Policy[] policies = new Gson().fromJson(reader, Policy[].class); long endCount = System.currentTimeMillis() - tickCount; Log.d("Time to pull policies in milliseconds", "" + endCount); ```