From 446b80077aed71e2384301ae993cf44416bf9a83 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Wed, 1 Jun 2016 07:30:23 +0200
Subject: [PATCH] clean up AstPath objects when no PSI is accessed, e.g. after
 project closing

---
 .../com/intellij/psi/impl/source/AstPathPsiMap.java  | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/platform/core-impl/src/com/intellij/psi/impl/source/AstPathPsiMap.java b/platform/core-impl/src/com/intellij/psi/impl/source/AstPathPsiMap.java
index 50764706ca1e..0be43afc1577 100644
--- a/platform/core-impl/src/com/intellij/psi/impl/source/AstPathPsiMap.java
+++ b/platform/core-impl/src/com/intellij/psi/impl/source/AstPathPsiMap.java
@@ -15,6 +15,7 @@
  */
 package com.intellij.psi.impl.source;
 
+import com.intellij.concurrency.JobScheduler;
 import com.intellij.extapi.psi.StubBasedPsiElementBase;
 import com.intellij.psi.impl.source.tree.AstPath;
 import com.intellij.psi.impl.source.tree.CompositeElement;
@@ -26,6 +27,7 @@ import org.jetbrains.annotations.Nullable;
 import java.lang.ref.ReferenceQueue;
 import java.lang.ref.WeakReference;
 import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.TimeUnit;
 
 /**
  * A weak cache for all instantiated stub-based PSI to allow {@link CompositeElement#getPsi()} return it when AST is reloaded.<p/>
@@ -39,6 +41,16 @@ class AstPathPsiMap {
    */
   private final ConcurrentMap<AstPath, MyReference> myMap = ContainerUtil.newConcurrentMap();
 
+  static {
+    JobScheduler.getScheduler().scheduleWithFixedDelay(new Runnable() {
+      @Override
+      public void run() {
+        // clean up AstPath objects when no PSI is accessed, e.g. after project closing
+        processQueue();
+      }
+    }, 5, 5, TimeUnit.SECONDS);
+  }
+
   void invalidatePsi() {
     processQueue();
     for (MyReference reference : myMap.values()) {