src/java.base/share/classes/java/lang/module/SystemModuleFinder.java

rev 15833 : 8168073: Speed up URI creation during module bootstrap
Reviewed-by: alanb, mchung, psandoz

*** 42,51 ****
--- 42,53 ----
  import java.util.function.Supplier;
  
  import jdk.internal.jimage.ImageLocation;
  import jdk.internal.jimage.ImageReader;
  import jdk.internal.jimage.ImageReaderFactory;
+ import jdk.internal.misc.JavaNetUriAccess;
+ import jdk.internal.misc.SharedSecrets;
  import jdk.internal.module.ModuleHashes;
  import jdk.internal.module.ModuleHashes.HashSupplier;
  import jdk.internal.module.SystemModules;
  import jdk.internal.module.ModulePatcher;
  import jdk.internal.perf.PerfCounter;
*** 69,78 ****
--- 71,82 ----
      private static final PerfCounter exportsCount
          = PerfCounter.newPerfCounter("jdk.module.finder.jimage.exports");
      // ImageReader used to access all modules in the image
      private static final ImageReader imageReader;
  
+     private static final JavaNetUriAccess jnua = SharedSecrets.getJavaNetUriAccess();
+ 
      // the set of modules in the run-time image
      private static final Set<ModuleReference> modules;
  
      // maps module name to module reference
      private static final Map<String, ModuleReference> nameToModule;
*** 164,174 ****
  
      private static ModuleReference toModuleReference(ModuleDescriptor md,
                                                       HashSupplier hash)
      {
          String mn = md.name();
!         URI uri = URI.create("jrt:/" + mn);
  
          Supplier<ModuleReader> readerSupplier = new Supplier<>() {
              @Override
              public ModuleReader get() {
                  return new ImageModuleReader(mn, uri);
--- 168,179 ----
  
      private static ModuleReference toModuleReference(ModuleDescriptor md,
                                                       HashSupplier hash)
      {
          String mn = md.name();
! 
!         URI uri = jnua.create("jrt", "/".concat(mn));
  
          Supplier<ModuleReader> readerSupplier = new Supplier<>() {
              @Override
              public ModuleReader get() {
                  return new ImageModuleReader(mn, uri);