1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
import scala.tools.nsc.io._
import java.net.URL
object A { def apply(d: { def apply(): Int}) = d.apply() }
object A2 { def apply(d: { def apply(): Int}) = d.apply() }
object A3 { def apply(d: { def apply(): Int}) = d.apply() }
object A4 { def apply(d: { def apply(): Int}) = d.apply() }
class B extends Function0[Int] {
def apply() = 3
}
object Test
{
type StructF0 = { def apply(): Int }
def main(args: Array[String]) {
for(i <- 0 until 150)
println(i + " " + test(A.apply) + " " + test(A2.apply) + " " + test(A3.apply) + " " + test(A3.apply))
}
def test(withF0: StructF0 => Int): Int = {
// Some large jar
val jar = File("../../../../lib/scalacheck.jar").toURL
// load a class in a separate loader that will be passed to A
val loader = new java.net.URLClassLoader(Array(File(".").toURL, jar))
// load a real class to fill perm gen space
Class.forName("org.scalacheck.Properties", true, loader).newInstance
// create a class from another class loader with an apply: Int method
val b = Class.forName("B", true, loader).newInstance
// pass instance to a, which will call apply using structural type reflection.
// This should hold on to the class for B, which means bLoader will not get collected
withF0(b.asInstanceOf[StructF0])
}
}
|
