tree 1ba5a6f70e74c4f19e4d8a5b75750e1a474e14ed
parent f9569936390ec3caadca9228a1a5fdd40e07c8ab
author Daniel Santiago Rivera <danysantiago@google.com> 1555346473 -0700
committer Daniel Santiago Rivera <danysantiago@google.com> 1564186158 -0700

Support Kotlin Coroutines Flow as query return types.

This CL adds QueryResultBinders and Providers Flow. Similar to Rx the
strategy is to generate code that calls into a runtime helper method to
setup Flow given a Callable that actually executes the query.

Channels are not directly supported and instead we show an error
suggesting to change the DAO function return type to Flow and then use
the neighboring functions to create a Channel. The reason is that we
can't reasonably produce a channel without a CoroutineScope and it is
a weird API to ask users to pass a CoroutineScope in their DAO method.

Suspend DAO function that returns Flow is an error.

Bug: 127328278
Bug: 130428884
Test: CoroutinesRoomTest, FlowQueryTest
Change-Id: If0fc6fdb741735f2e4b6b42015730bbf76e8dc18