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package mill.util
import java.net.{URL, URLClassLoader}
import io.github.retronym.java9rtexport.Export
import scala.util.Try
object ClassLoader {
def create(urls: Seq[URL],
parent: java.lang.ClassLoader)
(implicit ctx: Ctx.Home): URLClassLoader = {
create(urls, parent, _ => None)
}
def create(urls: Seq[URL],
parent: java.lang.ClassLoader,
customFindClass: String => Option[Class[_]])
(implicit ctx: Ctx.Home): URLClassLoader = {
new URLClassLoader(
makeUrls(urls).toArray,
refinePlatformParent(parent)
) {
override def findClass(name: String): Class[_] = {
if (name.startsWith("com.sun.jna")) getClass.getClassLoader.loadClass(name)
else customFindClass(name).getOrElse(super.findClass(name))
}
}
}
/**
* Return `ClassLoader.getPlatformClassLoader` for java 9 and above, if parent class loader is null,
* otherwise return same parent class loader.
* More details: https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-A868D0B9-026F-4D46-B979-901834343F9E
*
* `ClassLoader.getPlatformClassLoader` call is implemented via runtime reflection, cause otherwise
* mill could be compiled only with jdk 9 or above. We don't want to introduce this restriction now.
*/
private def refinePlatformParent(parent: java.lang.ClassLoader): ClassLoader = {
if (!ammonite.util.Util.java9OrAbove || parent != null) parent
else {
// Make sure when `parent == null`, we only delegate java.* classes
// to the parent getPlatformClassLoader. This is necessary because
// in Java 9+, somehow the getPlatformClassLoader ends up with all
// sorts of other non-java stuff on it's classpath, which is not what
// we want for an "isolated" classloader!
classOf[ClassLoader]
.getMethod("getPlatformClassLoader")
.invoke(null)
.asInstanceOf[ClassLoader]
}
}
private def makeUrls(urls: Seq[URL])(implicit ctx: Ctx.Home): Seq[URL] = {
if (ammonite.util.Util.java9OrAbove) {
urls :+ Export.rtAt(ctx.home.toIO).toURI.toURL
} else {
urls
}
}
}
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