Repair example #1 for providing different service implementations

[pscheid92]

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[CLAassistant]

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[adamgfraser]

The use of provideSome is more idiomatic here. It is sometimes necessary to specify the type of the services that are not being provided yet.

[adamgfraser]

I would use provide and provideSome consistently here.

[pscheid92]

That is exactly what I intended here, or did I get you wrong?

We use myApp.provideSome[ZIOAppArgs](AppConfig.appArgsLayer) in the code block above. That's why I changed the diff here as well. So it explains to a reader that we now remove the configuration from app args and use system properties instead.

Remove: myApp.provideSome[ZIOAppArgs](AppConfig.appArgsLayer)
Insert: myApp.provideLayer(AppConfig.systemEnvLayer)

This is how it would be rendered:

[adamgfraser]

Right. if we were using provideSome before we should use provide now.

Basically we have two "axes". One is whether we are using manual layer construction (provideLayer or provideSomeLayer) versus automatic layer construction (provide or provideSome). The second is whether we are providing all of the environment (provide or provideLayer) or some of it (provideSome or provideSomeLayer).

So these lines are somewhat confusing right now if that we are trying to illustrate how we use a different operator when we have a layer that doesn't have any other requirements but we are also changing back and forth between automatic and manual layer construction.

[pscheid92]

Ah, I didn't notice!

So let's say we use automatic layer construction for this example (since all other examples on that page use it, too). Then we would have the following lines:

• myApp.provideSome[ZIOAppArgs](AppConfig.appArgsLayer)
• myApp.provide(AppConfig.systemEnvLayer)

For the configuration via arguments, we use provideSome since we don't provide ZIOAppArgs yet. For the configuration via system properties, we use provide, since we completely construct the layer.

WDYT?

[adamgfraser]

Exactly!

[pscheid92]

👍 I updated the commit.