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Andrei Shikov
cf6f3b680b
Summary: Creates a `WritableMapBuffer` abstraction to pass data from JVM to C++, similarly to `ReadableMapBuffer`. This part also defines a Kotlin interface for both `Readable/WritableMapBuffer` to allow to use them interchangeably on Java side. `WritableMapBuffer` is using Android's `SparseArray` which has almost identical structure to `MapBuffer`, with `log(N)` random access and instant sequential access. To avoid paying the cost of JNI transfer, the data is only transferred when requested by native `JWritableMapBuffer::getMapBuffer`. `WritableMapBuffer` also owns it data, meaning it cannot be "consumed" as `WritableNativeMap`, with C++ usually receiving copy of the data on conversion. This allows to use `WritableMapBuffer` as JVM-only implementation of `MapBuffer` interface as well, e.g. for testing (although Robolectric will still be required due to `SparseArray` used as storage) Changelog: [Android][Added] - MapBuffer implementation for JVM -> C++ communication Reviewed By: mdvacca Differential Revision: D35014011 fbshipit-source-id: 8430212bf6152b966cde8e6f483b4f2dab369e4e