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android: Use Provider to construct OkHttpChannelBuilder #9003

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merged 1 commit into from
Mar 24, 2022

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@ejona86 ejona86 commented Mar 21, 2022

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.

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.
@ejona86 ejona86 merged commit cda0e9d into grpc:master Mar 24, 2022
@ejona86 ejona86 deleted the android-okhttp-provider branch March 24, 2022 21:52
@github-actions github-actions bot locked as resolved and limited conversation to collaborators Jun 23, 2022
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2 participants