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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.parquet.hadoop.codec;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;

import com.facebook.presto.hive.$internal.org.slf4j.Logger;
import com.facebook.presto.hive.$internal.org.slf4j.LoggerFactory;

/**
 * A Helper class which use reflections to clean up DirectBuffer. It's implemented for
 * better compatibility with both java8 and java9+, because the Cleaner class is moved to
 * another place since java9+.
 *
 * Strongly inspired by:
 * https://github.com/apache/tomcat/blob/master/java/org/apache/tomcat/util/buf/ByteBufferUtils.java
 */
public class CleanUtil
{
  private static final Logger logger = LoggerFactory.getLogger(CleanUtil.class);

  private static final Object unsafe;
  private static final Method cleanerMethod;
  private static final Method cleanMethod;
  private static final Method invokeCleanerMethod;

  private static final int majorVersion =
    Integer.parseInt(System.getProperty("java.version").split("\\D+")[0]);

  static {
    final ByteBuffer tempBuffer = ByteBuffer.allocateDirect(0);
    Method cleanerMethodLocal = null;
    Method cleanMethodLocal = null;
    Object unsafeLocal = null;
    Method invokeCleanerMethodLocal = null;
    if (majorVersion >= 9) {
      try {
        final Class clazz = Class.forName("sun.misc.Unsafe");
        final Field theUnsafe = clazz.getDeclaredField("theUnsafe");
        theUnsafe.setAccessible(true);
        unsafeLocal = theUnsafe.get(null);
        invokeCleanerMethodLocal = clazz.getMethod("invokeCleaner", ByteBuffer.class);
        invokeCleanerMethodLocal.invoke(unsafeLocal, tempBuffer);
      } catch (IllegalAccessException | IllegalArgumentException
        | InvocationTargetException | NoSuchMethodException | SecurityException
        | ClassNotFoundException | NoSuchFieldException e) {
        logger.warn("Cannot use direct ByteBuffer cleaner, memory leaking may occur", e);
        unsafeLocal = null;
        invokeCleanerMethodLocal = null;
      }
    } else {
      try {
        cleanerMethodLocal = tempBuffer.getClass().getMethod("cleaner");
        cleanerMethodLocal.setAccessible(true);
        final Object cleanerObject = cleanerMethodLocal.invoke(tempBuffer);
        cleanMethodLocal = cleanerObject.getClass().getMethod("clean");
        cleanMethodLocal.invoke(cleanerObject);
      } catch (NoSuchMethodException | SecurityException | IllegalAccessException |
        IllegalArgumentException | InvocationTargetException e) {
        logger.warn("Cannot use direct ByteBuffer cleaner, memory leaking may occur", e);
        cleanerMethodLocal = null;
        cleanMethodLocal = null;
      }
    }
    cleanerMethod = cleanerMethodLocal;
    cleanMethod = cleanMethodLocal;
    unsafe = unsafeLocal;
    invokeCleanerMethod = invokeCleanerMethodLocal;
  }

  private CleanUtil() {
    // Hide the default constructor since this is a utility class.
  }

  public static void cleanDirectBuffer(ByteBuffer buf) {
    if (cleanMethod != null) {
      try {
        cleanMethod.invoke(cleanerMethod.invoke(buf));
      } catch (IllegalAccessException | IllegalArgumentException
        | InvocationTargetException | SecurityException e) {
        logger.warn("Error while cleaning up the DirectBuffer", e);
      }
    } else if (invokeCleanerMethod != null) {
      try {
        invokeCleanerMethod.invoke(unsafe, buf);
      } catch (IllegalAccessException | IllegalArgumentException
        | InvocationTargetException | SecurityException e) {
        logger.warn("Error while cleaning up the DirectBuffer", e);
      }
    }
  }
}