From fe18e3fa313d582d1534cf3aa2c007bfa6978f52 Mon Sep 17 00:00:00 2001
From: Alexander Udalov <alexander.udalov@jetbrains.com>
Date: Fri, 23 Jul 2021 20:53:48 +0200
Subject: [PATCH] Do not use uninterruptible file channels in FileChannelUtil

To avoid illegal access errors from incremental compilation on JDK 16+.

 #KT-45689 Fixed
 #KT-47152 Fixed
---
 .../com/intellij/util/io/FileChannelUtil.java | 61 ++-----------------
 1 file changed, 4 insertions(+), 57 deletions(-)

diff --git a/compiler/cli/src/com/intellij/util/io/FileChannelUtil.java b/compiler/cli/src/com/intellij/util/io/FileChannelUtil.java
index c98dadb6a04..338a09ec286 100644
--- a/compiler/cli/src/com/intellij/util/io/FileChannelUtil.java
+++ b/compiler/cli/src/com/intellij/util/io/FileChannelUtil.java
@@ -1,66 +1,13 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.util.io;
 
-import com.intellij.openapi.diagnostic.Logger;
-import com.intellij.util.ExceptionUtil;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
-import java.lang.invoke.MethodHandle;
-import java.lang.invoke.MethodHandles;
-import java.lang.invoke.MethodType;
 import java.nio.channels.FileChannel;
 
-final class FileChannelUtil {
-  private static final Logger LOG = Logger.getInstance(FileChannelUtil.class);
-
-  private static final Class<?> sunNioChFileChannelImpl = setupFileChannelImpl();
-  private static final MethodHandle setUnInterruptible = setupUnInterruptibleHandle();
-
-  private static Class<?> setupFileChannelImpl() {
-    try {
-      return Class.forName("sun.nio.ch.FileChannelImpl");
+public final class FileChannelUtil {
+    @NotNull
+    static FileChannel unInterruptible(@NotNull FileChannel channel) {
+        return channel;
     }
-    catch (ClassNotFoundException ignored) {}
-    return null;
-  }
-
-  @Nullable
-  private static MethodHandle setupUnInterruptibleHandle() {
-    MethodHandle setUnInterruptible = null;
-    try {
-      if (sunNioChFileChannelImpl != null) {
-        // noinspection SpellCheckingInspection
-        setUnInterruptible = MethodHandles
-          .lookup()
-          .findVirtual(sunNioChFileChannelImpl, "setUninterruptible", MethodType.methodType(void.class));
-      }
-    }
-    catch (NoSuchMethodException e) {
-      LOG.info("interruptible FileChannels will be used for indexes");
-    }
-    catch (IllegalAccessException e) {
-      LOG.error(e);
-    }
-    if (setUnInterruptible != null) {
-      LOG.info("uninterruptible FileChannels will be used for indexes");
-    }
-    else {
-      LOG.info("interruptible FileChannels will be used for indexes");
-    }
-    return setUnInterruptible;
-  }
-
-  @NotNull
-  static FileChannel unInterruptible(@NotNull FileChannel channel) {
-    try {
-      if (setUnInterruptible != null && sunNioChFileChannelImpl != null && sunNioChFileChannelImpl.isInstance(channel)) {
-        setUnInterruptible.invoke(channel);
-      }
-    }
-    catch (Throwable e) {
-      ExceptionUtil.rethrow(e);
-    }
-    return channel;
-  }
 }