cache4k

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Is it possible to set the expiration time during execution of the loader?

Trying to cache some oauth tokens whose expiration time is known when the loader gets them. Not before.

It is such a good and useful enhancement and it would be awesome to have it in this lib.

we even have kotlinx.datetime which should make this simpler to impl for all platforms in commonMain only.

Thanks everyone, I might take a look at this soon.

Can you share a few examples of your use cases and how you think the APIs should look like? Is this a feature you've used in other caching libraries in the past?

Example of function description:

public data class LoaderContext internal constructor(
    var expireAfterAccessDuration: Duration,
    var expireAfterWriteDuration: Duration
)

public suspend fun get(key: Key, loader: suspend LoaderContext.() -> Value): Value
// looks like it should be a new 'put' function with 'customizing'
public suspend fun put(key: Key, loader: suspend LoaderContext.() -> Value)

Example of usage:

suspend fun cacheToken(key: String, ttl: Duration): Any {
   cache.put(key) {
      // by default cache-level configured values are set
      this.expireAfterAccessDuration = ttl
      // ...
   }
}

suspend fun someFun(key: String, ttl: Duration): Any {
   cache.get(key) {
      this.expireAfterWriteDuration = ttl
      // ...
   }
}

Is this a feature you've used in other caching libraries in the past?

Using it a lot with Redis

I'd add the feature as part of the builder:

dynamicExpireAfterWrite{ it.expires_in.seconds }