[GraphHopper] what is the use case of SynchedDAWrapper?

[John Zhao]

Hi Peter,

This question is for you. :)

I guess MMapDataAccess is mainly designed for running Graphhopper on
Android device, which you can't load all the data into the limited memory.

In the comment of MMapDataAccess:
This is a data structure which uses the operating system to synchronize
between disc and memory.
Use SynchDAWrapper if you intent to use this from multiple threads!

why GH need a thread-safe one, somebody want to do the extract on Android
device?
just curious.

Thanks in advance.

*Best Regards,*
*ZhiQiang ZHAO*
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