android: Use Provider to construct OkHttpChannelBuilder #9003
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Doing any reflection on OkHttpChannelBuilder requires that all methods can have their arguments resolved. We'd like to make okhttp an optional dependency (to support okhttp 2 and 3/4 simultaneously). But making okhttp optional means we can no longer construct OkHttpChannelBuilder reflectively. We swap to the Provider that doesn't have this problem. See grpc#8971. Note that ManagedChannelProvider itself only exposes its methods as protected, so they wouldn't be accessible. However OkHttpChannelProvider has its methods public. It is an open question of whether ManagedChannelProvider's methods should become public, but in any case we can hide a public OkHttpChannelProvider inside a package-private class so it is only accessable via reflection. So this code assuming public methods doesn't prevent future implementation hiding.
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temawi
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Mar 24, 2022
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Doing any reflection on OkHttpChannelBuilder requires that all methods
can have their arguments resolved. We'd like to make okhttp an optional
dependency (to support okhttp 2 and 3/4 simultaneously). But making
okhttp optional means we can no longer construct OkHttpChannelBuilder
reflectively. We swap to the Provider that doesn't have this problem.
See #8971.
Note that ManagedChannelProvider itself only exposes its methods as
protected, so they wouldn't be accessible. However OkHttpChannelProvider
has its methods public. It is an open question of whether
ManagedChannelProvider's methods should become public, but in any case
we can hide a public OkHttpChannelProvider inside a package-private
class so it is only accessable via reflection. So this code assuming
public methods doesn't prevent future implementation hiding.
CC @YifeiZhuang, @beatrausch
I've tested that grpc-android compiles after this change and #8971. So we could merge this first if we want, and then #8971 could safely be merged.