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Chris Lewis 22efd95be1 Add back ability to customise OkHttp client

Summary:
Prior to 0a71f48b13, users could customise the OkHttp client used by React Native on Android by calling replaceOkHttpClient in OkHttpClientProvider.

This functionality has a variety of legitimate applications from changing connection timeouts or pool size to Stetho integration. The challenge is to add back support for replacing the client without causing a breaking change or reintroducing the problems olegbl sought to address in his original commit.

Introducing a client factory archives these aims, it adds a new, backwards compatible interface and is called each time a client is requested rather than re-using the same instance (unless you explicitly want this behaviour, in which case you could replicate it using a static class property inside your custom factory).

A number of PRs have been opened to add this functionality: https://github.com/facebook/react-native/pull/14675, https://github.com/facebook/react-native/pull/14068.

I don't have a lot of Java experience so I'm open to better/more idiomatic ways to achieve this :)

Create React Native application and set a custom factory in the constructor, e.g.  `OkHttpClientProvider.setOkHttpClientFactory(new CustomNetworkModule());`

Where a custom factory would look like:

```
class CustomNetworkModule implements OkHttpClientFactory {
    public OkHttpClient createNewNetworkModuleClient() {
        return new OkHttpClient.Builder().build();
    }
}
```

Remove the existing replace client method to prevent accident use and alert existing users that its functionality has changed: https://github.com/facebook/react-native/pull/16972

[Android] [Minor] [Networking] - | Provide interface for customising the OkHttp client used by React Native |
Closes https://github.com/facebook/react-native/pull/17237

Differential Revision: D6837734

Pulled By: hramos

fbshipit-source-id: 81e63df7716e6f9039ea12e99233f6336c6dd7ef

2018-01-30 11:58:45 -08:00