org.voltcore.utils.ReflectiveDirectBufferCleaner Maven / Gradle / Ivy
/* This file is part of VoltDB.
* Copyright (C) 2008-2020 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see .
*/
package org.voltcore.utils;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
/**
* {@link DirectBufferCleaner} implementation based on {@code sun.misc.Cleaner} and
* {@code sun.nio.ch.DirectBuffer.cleaner()} method.
*
* Note: This implementation will not work on Java 9+.
*/
public class ReflectiveDirectBufferCleaner implements DirectBufferCleaner {
/** Cleaner method. */
private final Method cleanerMtd;
/** Clean method. */
private final Method cleanMtd;
/** */
public ReflectiveDirectBufferCleaner() {
try {
cleanerMtd = Class.forName("sun.nio.ch.DirectBuffer").getMethod("cleaner");
} catch (ClassNotFoundException | NoSuchMethodException e) {
throw new RuntimeException("No sun.nio.ch.DirectBuffer.cleaner() method found", e);
}
try {
cleanMtd = Class.forName("sun.misc.Cleaner").getMethod("clean");
} catch (ClassNotFoundException | NoSuchMethodException e) {
throw new RuntimeException("No sun.misc.Cleaner.clean() method found", e);
}
}
@Override
public void clean(ByteBuffer buf) {
try {
Object cleaner = cleanerMtd.invoke(buf);
assert cleaner != null;
cleanMtd.invoke(cleaner);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException("Failed to invoke direct buffer cleaner", e);
}
}
}