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products/Sources/formale Sprachen/Java/Tomcat/java/org/apache/tomcat/util/compat/ (Apache Software Stiftung Version 2.4.65^©) Datei vom 10.10.2023 mit Größe 3 kB

Quelle Jre21Compat.java Sprache: JAVA

/*
*  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.tomcat.util.compat;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;

public class Jre21Compat extends Jre19Compat {

    private static final Log log = LogFactory.getLog(Jre21Compat.class);
    private static final StringManager sm = StringManager.getManager(Jre21Compat.class);

    private static final Method nameMethod;
    private static final Method startMethod;
    private static final Method ofVirtualMethod;

    static {
        Class<?> c1 = null;
        Method m1 = null;
        Method m2 = null;
        Method m3 = null;

        try {
            c1 = Class.forName("java.lang.Thread$Builder");
            m1 = c1.getMethod("name", String.class, long.class);
            m2 = c1.getMethod("start", Runnable.class);
            m3 = Thread.class.getMethod("ofVirtual", (Class<?>[]) null);
        } catch (ClassNotFoundException e) {
            // Must be pre-Java 21
            log.debug(sm.getString("jre21Compat.javaPre21"), e);
        } catch (ReflectiveOperationException e) {
            // Should never happen
            log.error(sm.getString("jre21Compat.unexpected"), e);
        }
        nameMethod = m1;
        startMethod = m2;
        ofVirtualMethod = m3;
    }

    static boolean isSupported() {
        return ofVirtualMethod != null;
    }

    @Override
    public Object createVirtualThreadBuilder(String name) {
        try {
            Object threadBuilder = ofVirtualMethod.invoke(null, (Object[]) null);
            nameMethod.invoke(threadBuilder, name, Long.valueOf(0));
            return threadBuilder;
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            throw new UnsupportedOperationException(e);
        }
    }

    @Override
    public void threadBuilderStart(Object threadBuilder, Runnable command) {
        try {
            startMethod.invoke(threadBuilder, command);
        } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            throw new UnsupportedOperationException(e);
        }
    }
}

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