Nicer way to optionally get a ContextPlugin extension about javalin HOT 6 OPEN

The code just assumes if the plugin is not there, it's not relevant to that app, so it skips a block and continues on.

So something like logging, tracing, analytics?

FWIW I'm translating code from Ktor, which has a pluginOrNull function.

I supposed we could have withOrWithout(MyPlugin) (only half-joking 😄)

I'm not a fan of how withOrNull sounds, so maybe your maybeWith or tryWith. Feel free to submit a PR, and we can discuss the naming there.

from javalin.

Okay, my bad, I was looking at 5.4.3-SNAPSHOT 🤦‍♀️

from javalin.

Hi @juggernaut0, could you tell us a bit more about your use case? How does the program recover if the plugin is not there?

from javalin.

I have some utility functions and plugins that are used across several projects, but not every project needs every plugin.

The code just assumes if the plugin is not there, it's not relevant to that app, so it skips a block and continues on.

There's plenty of workarounds like the try-catch, using nullable ctx.attribute to stash some state, (would prefer the more typesafe plugin api), always adding the plugin but configuring it do do nothing sometimes (feels like boilerplate), or making several versions of the functions.

Basically, the idea is augmenting behavior based on a plugin, but not requiring it to be installed.

FWIW I'm translating code from Ktor, which has a pluginOrNull function.

from javalin.

Wouldn't it be easier to just cover this with app data?

 // Javalin's key
data class Key<T>(val id: String)

// Define a key
val OptionalMetrics = Key<Metrics?>("optional-metrics")

// Register data
cfg.pvt.appAttributes[OptionalMetrics] // null or not

// Handler
ctx.appData(OptionalMetrics)?.example("abc")

I'm not sure why there's no public register function for app data, so @tipsy may need to clarify this area.

from javalin.

I'm not sure why there's no public register function for app data, so @tipsy may need to clarify this area.

From https://javalin.io/documentation#app-data:

val app = Javalin.create { config ->
    config.appData(myKey, myValue)
}

from javalin.