用于保存资源的 DSL
谁能帮我构建一个 DSL 来保存资源？我想像Java的synchronized一样使用它，这样如果一个资源（java：对象监视器）已经被获取，它就不会再次被获取！ （对于以下示例，资源假定为 Int 类型）
object Holding {
def main(args : Array[String]) : Unit = {
HoldResource(1,2,3) {
// holding resource 1,2,3
println("!")
HoldResource(3) {
// still holding resource 1,2,3 (but not acquiring resource 3 again!!!)
println("*")
}
println("!!")
HoldResource(4,5) {
// holding resource 1,2,3,4,5
println("#")
}
println("!!!")
}
// all resources are freed
}
}
到目前为止，我的粗略方法看起来像这样（这意味着我知道 try { ... } finally { ... } 资源模式。）：
object HoldResource {
class Context(val resources: Seq[Int]) {
def apply[A](f: => A): A = {
try { f } finally {
// free resources
}
}
}
def apply[A](resources: Int*): Context = {
// lock/acquire resources
new Context(resources)
}
}
非常感谢！
Can anyone help me build a DSL for holding resources? I want to use it similar to Java's synchronized, so that if a resource (java: an object monitor) is already acquired it won't get acquired again! (For the following example resources are assumed to be of type Int)
object Holding {
def main(args : Array[String]) : Unit = {
HoldResource(1,2,3) {
// holding resource 1,2,3
println("!")
HoldResource(3) {
// still holding resource 1,2,3 (but not acquiring resource 3 again!!!)
println("*")
}
println("!!")
HoldResource(4,5) {
// holding resource 1,2,3,4,5
println("#")
}
println("!!!")
}
// all resources are freed
}
}
Until now my ROUGH approach looks like this (that means I know about the try { ... } finally { ... } resource-pattern.) :
object HoldResource {
class Context(val resources: Seq[Int]) {
def apply[A](f: => A): A = {
try { f } finally {
// free resources
}
}
}
def apply[A](resources: Int*): Context = {
// lock/acquire resources
new Context(resources)
}
}
Thanks a lot!
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