Created
February 7, 2018 03:23
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Scala `defer` like Golang
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class Deferred() { | |
private var fs: Seq[() => Any] = Nil | |
def apply(f: => Any): Unit = { | |
fs = { () => | |
f | |
} +: fs | |
} | |
def runDeferred(): Unit = fs.reverse foreach { _.apply } | |
} | |
def deferrable[A](f: Deferred => A): Unit = { | |
val d = new Deferred() | |
try { | |
f(d) | |
} finally { | |
d.runDeferred() | |
} | |
} | |
private def run() = deferrable { defer => | |
defer(println("shutting down...")) | |
defer(Database.shutDown()) | |
defer(println("shutdown completed!")) | |
Database.setup() | |
val result = MyTable.findAll() | |
println(result) | |
} |
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