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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.tomcat.util.compat;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionException;
import javax.security.auth.Subject;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
public class Jre21Compat extends Jre20Compat {
private static final Log log = LogFactory.getLog(Jre21Compat.class);
private static final StringManager sm = StringManager.getManager(Jre21Compat.class);
private static final boolean supported;
private static final Method nameMethod;
private static final Method startMethod;
private static final Method ofVirtualMethod;
private static final Method callAsMethod;
static {
Class<?> c1 = null;
Method m1 = null;
Method m2 = null;
Method m3 = null;
Method m4 = null;
try {
// Note: Virtual threads is the main new feature in Java 21, but it was previously
// present as a preview. As a result, it is more accurate to test for another
// new class
c1 = Class.forName("java.util.SequencedCollection");
Class<?> c2 = Class.forName("java.lang.Thread$Builder");
m1 = c2.getMethod("name", String.class, long.class);
m2 = c2.getMethod("start", Runnable.class);
m3 = Thread.class.getMethod("ofVirtual", (Class<?>[]) null);
m4 = Subject.class.getMethod("callAs", Subject.class, Callable.class);
} 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);
}
supported = (c1 != null);
nameMethod = m1;
startMethod = m2;
ofVirtualMethod = m3;
callAsMethod = m4;
}
static boolean isSupported() {
return supported;
}
@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);
}
}
@SuppressWarnings("unchecked")
@Override
public <T> T callAs(Subject subject, Callable<T> action) throws CompletionException {
try {
return (T) callAsMethod.invoke(null, subject, action);
} catch (IllegalAccessException e) {
throw new CompletionException(e);
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
if (cause instanceof CompletionException) {
throw (CompletionException) cause;
}
throw new CompletionException(e);
}
}
@Override
public boolean isCanonCachesDisabled() {
// The cache has been removed in Java 21
return true;
}
@Override
public boolean disableCanonCaches() {
// The cache has been removed in Java 21
return true;
}
}
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