Roiocam commented on PR #1304:
URL: https://github.com/apache/pekko/pull/1304#issuecomment-2106689353
Use the cacheable partial function, and then verify it works.
```scala
var calTime: Int = 0
def entityId(value: Any): String = {
calTime = calTime + 1
value match {
case "wrong" => null
case _ => String.valueOf(value)
}
}
def extractEntityIdFromExtractor: PartialFunction[Any, Any] =
new scala.runtime.AbstractPartialFunction[Any, (String, Any)] {
var cache: String = _
override def isDefinedAt(msg: Any): Boolean = {
cache = entityId(msg)
cache != null
}
override def apply(x: Any): (String, Any) = (cache, x)
}
lazy val xx = extractEntityIdFromExtractor
lazy val yy: PartialFunction[Any, Any] = {
case message if entityId(message) != null => (entityId(message), message)
}
assert(!xx.isDefinedAt("wrong"))
assert(!yy.isDefinedAt("wrong"))
calTime = 0
val health = "health"
println(xx.isDefinedAt(health))
println(xx(health))
println(s"caltime = $calTime")
println("=====")
calTime = 0
println(yy.isDefinedAt(health))
println(yy(health))
println(s"caltime = $calTime")
```
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