From 5f5fb627659c78494fc6e2a0df7112fddcd7d42a Mon Sep 17 00:00:00 2001
From: Dmitry Avdeev <Dmitry.Avdeev@jetbrains.com>
Date: Wed, 19 Sep 2012 12:11:20 +0400
Subject: [PATCH] cache for not found classes: bundles loading optimization

---
 .../util/src/com/intellij/util/lang/UrlClassLoader.java     | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/platform/util/src/com/intellij/util/lang/UrlClassLoader.java b/platform/util/src/com/intellij/util/lang/UrlClassLoader.java
index 8443fb9fb1fe..5299cf9e5be1 100644
--- a/platform/util/src/com/intellij/util/lang/UrlClassLoader.java
+++ b/platform/util/src/com/intellij/util/lang/UrlClassLoader.java
@@ -17,6 +17,7 @@
 package com.intellij.util.lang;
 
 import com.intellij.openapi.diagnostic.Logger;
+import gnu.trove.THashSet;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -31,6 +32,7 @@ import java.util.*;
 public class UrlClassLoader extends ClassLoader {
   private final ClassPath myClassPath;
   private final List<URL> myURLs;
+  private final Set<String> myNotFound = new THashSet<String>();
   @NonNls static final String CLASS_EXTENSION = ".class";
   protected static final boolean myDebugTime = false;
   protected static final long NS_THRESHOLD = 10000000;
@@ -68,8 +70,12 @@ public class UrlClassLoader extends ClassLoader {
   }
 
   protected Class findClass(final String name) throws ClassNotFoundException {
+    if (myNotFound.contains(name)) {
+      throw new ClassNotFoundException(name);
+    }
     Resource res = myClassPath.getResource(name.replace('.', '/').concat(CLASS_EXTENSION), false);
     if (res == null) {
+      myNotFound.add(name);
       throw new ClassNotFoundException(name);
     }