Copy FileChannelUtil from intellij-core

#KT-45689
 #KT-47152

compiler/cli/src/com/intellij/util/io/FileChannelUtil.java

@@ -0,0 +1,66 @@
+// 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");
+    }
+    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;
+  }
+}