CleanerJava25.java — netty Source File

Source Code

/*
 * Copyright 2025 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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 io.netty.util.internal;

import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.nio.ByteBuffer;

import static java.lang.invoke.MethodType.methodType;

/**
 * Provide a way to clean direct {@link ByteBuffer} instances on Java 24+,
 * where we don't have {@code Unsafe} available, but we have memory segments.
 */
final class CleanerJava25 implements Cleaner {
    private static final InternalLogger logger;

    private static final MethodHandle INVOKE_ALLOCATOR;

    static {
        boolean suitableJavaVersion;
        if (System.getProperty("org.graalvm.nativeimage.imagecode") != null) {
            // native image supports this since 25, but we don't use PlatformDependent0 here, since
            // we need to initialize CleanerJava25 at build time.
            String v = System.getProperty("java.specification.version");
            try {
                suitableJavaVersion = Integer.parseInt(v) >= 25;
            } catch (NumberFormatException e) {
                suitableJavaVersion = false;
            }
            // also need to prevent initializing the logger at build time
            logger = null;
        } else {
            // Only attempt to use MemorySegments on Java 25 or greater, because of the following JDK bugs:
            // - https://bugs.openjdk.org/browse/JDK-8357145
            // - https://bugs.openjdk.org/browse/JDK-8357268
            suitableJavaVersion = PlatformDependent0.javaVersion() >= 25;
            logger = InternalLoggerFactory.getInstance(CleanerJava25.class);
        }

        MethodHandle method;
        Throwable error;
        if (suitableJavaVersion) {
            try {
// ... (165 more lines)