lazySet is not triggering update events

[xmlking]

val handler = Account.maxRetry.onSet { value -> println("the maxRetry has changed to $value") }
val handler2 = Account.maxRetry.beforeSet { config, value -> println("the maxRetry will change to $value") }
val handler3 = config.beforeSet { item, value -> println("${item.name} will change to $value") }

val maxRetry by config.property(Account.maxRetry)
println(maxRetry)
config.lazySet(Account.maxRetry) { 4 }
println(maxRetry)
config[Account.maxRetry] = 6
println(maxRetry)

3
4
the maxRetry has changed to 6
the maxRetry will change to 6
maxRetry will change to 6
6

[uchuhimo]

@xmlking It is difficult to decide how lazySet triggers onSet.

• If we trigger onSet when config.lazySet(Account.maxRetry) { 4 }, we have to evaluate { 4 }, which may be an expansive/non-deterministic calculation.
• If we trigger onSet when println(maxRetry), we have to trigger for every get operation of maxRetry.

Maybe the better solution is to add a new onLazySet API.

Which solution do you prefer?

[stale]

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