From 617a720dc6e1eba3bc30bb4e91737f51009ea616 Mon Sep 17 00:00:00 2001
From: Maxim Shafirov <max@jetbrains.com>
Date: Fri, 9 Sep 2011 17:48:17 +0400
Subject: [PATCH] Cache for real

---
 .../src/com/intellij/ui/DeferredIconImpl.java | 23 +++++++------
 .../src/com/intellij/ui/IconDeferrerImpl.java | 33 +++++++++----------
 2 files changed, 27 insertions(+), 29 deletions(-)

diff --git a/platform/lang-impl/src/com/intellij/ui/DeferredIconImpl.java b/platform/lang-impl/src/com/intellij/ui/DeferredIconImpl.java
index 01cfef76fde2..b4c5c8515566 100644
--- a/platform/lang-impl/src/com/intellij/ui/DeferredIconImpl.java
+++ b/platform/lang-impl/src/com/intellij/ui/DeferredIconImpl.java
@@ -47,7 +47,7 @@ public class DeferredIconImpl<T> implements DeferredIcon {
   private boolean myNeedReadAction;
   private boolean myDone;
 
-  private IconDisposer<T> myDisposer;
+  private IconListener<T> myEvalListener;
 
   public DeferredIconImpl(Icon baseIcon, T param, Function<T, Icon> evaluator) {
     this(baseIcon, param, true, evaluator);
@@ -109,14 +109,15 @@ public class DeferredIconImpl<T> implements DeferredIcon {
       JobUtil.submitToJobThread(Job.DEFAULT_PRIORITY, new Runnable() {
         public void run() {
           int oldWidth = myDelegateIcon.getIconWidth();
-          myDelegateIcon = evaluate();
+          final Icon result = evaluate();
+          myDelegateIcon = result;
 
           final boolean shouldRevalidate = Registry.is("ide.tree.deferredicon.invalidates.cache") && myDelegateIcon.getIconWidth() != oldWidth;
 
           //noinspection SSBasedInspection
           SwingUtilities.invokeLater(new Runnable() {
             public void run() {
-              setDone();
+              setDone(result);
 
               Component actualTarget = target.get();
               if (SwingUtilities.getWindowAncestor(actualTarget) == null) {
@@ -157,9 +158,9 @@ public class DeferredIconImpl<T> implements DeferredIcon {
     }
   }
 
-  private void setDone() {
-    if (myDisposer != null) {
-      myDisposer.dispose(myParam);
+  private void setDone(Icon result) {
+    if (myEvalListener != null) {
+      myEvalListener.evalDone(myParam, result);
     }
 
     myDone = true;
@@ -271,15 +272,13 @@ public class DeferredIconImpl<T> implements DeferredIcon {
   }
 
 
-  public DeferredIconImpl setDisposer(IconDisposer<T> disposer) {
-    myDisposer = disposer;
+  public DeferredIconImpl setDoneListener(IconListener<T> disposer) {
+    myEvalListener = disposer;
     return this;
   }
 
-  public interface IconDisposer<T> {
-
-    void dispose(T key);
-
+  public interface IconListener<T> {
+    void evalDone(T key, Icon result);
   }
 
 }
diff --git a/platform/lang-impl/src/com/intellij/ui/IconDeferrerImpl.java b/platform/lang-impl/src/com/intellij/ui/IconDeferrerImpl.java
index f157d521aa9c..7f6318c7196f 100644
--- a/platform/lang-impl/src/com/intellij/ui/IconDeferrerImpl.java
+++ b/platform/lang-impl/src/com/intellij/ui/IconDeferrerImpl.java
@@ -19,20 +19,16 @@
  */
 package com.intellij.ui;
 
+import com.intellij.ProjectTopics;
 import com.intellij.openapi.application.ApplicationManager;
-import com.intellij.openapi.project.Project;
-import com.intellij.openapi.project.impl.ProjectLifecycleListener;
-import com.intellij.openapi.vfs.VirtualFileManager;
-import com.intellij.openapi.vfs.newvfs.BulkFileListener;
-import com.intellij.openapi.vfs.newvfs.events.VFileEvent;
+import com.intellij.openapi.project.DumbService;
+import com.intellij.psi.util.PsiModificationTracker;
 import com.intellij.util.Function;
 import com.intellij.util.messages.MessageBus;
 import com.intellij.util.messages.MessageBusConnection;
-import org.jetbrains.annotations.NotNull;
 
 import javax.swing.*;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
 public class IconDeferrerImpl extends IconDeferrer {
@@ -41,17 +37,20 @@ public class IconDeferrerImpl extends IconDeferrer {
 
   public IconDeferrerImpl(MessageBus bus) {
     final MessageBusConnection connection = bus.connect();
-    connection.subscribe(VirtualFileManager.VFS_CHANGES, new BulkFileListener() {
-      public void before(final List<? extends VFileEvent> events) {
-      }
-
-      public void after(final List<? extends VFileEvent> events) {
+    connection.subscribe(ProjectTopics.MODIFICATION_TRACKER, new PsiModificationTracker.Listener() {
+      @Override
+      public void modificationCountChanged() {
         clear();
       }
     });
-    connection.subscribe(ProjectLifecycleListener.TOPIC, new ProjectLifecycleListener.Adapter() {
+
+    connection.subscribe(DumbService.DUMB_MODE, new DumbService.DumbModeListener() {
       @Override
-      public void afterProjectClosed(@NotNull Project project) {
+      public void enteredDumbMode() {
+      }
+
+      @Override
+      public void exitDumbMode() {
         clear();
       }
     });
@@ -71,11 +70,11 @@ public class IconDeferrerImpl extends IconDeferrer {
     synchronized (LOCK) {
       Icon result = myIconsCache.get(param);
       if (result == null) {
-        result = new DeferredIconImpl<T>(base, param, f).setDisposer(new DeferredIconImpl.IconDisposer<T>() {
+        result = new DeferredIconImpl<T>(base, param, f).setDoneListener(new DeferredIconImpl.IconListener<T>() {
           @Override
-          public void dispose(T key) {
+          public void evalDone(T key, Icon r) {
             synchronized (LOCK) {
-              myIconsCache.remove(key);
+              myIconsCache.put(key, r);
             }
           }
         });