org.wildfly.naming.client.remote.TCCLUtils Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2019 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.wildfly.naming.client.remote;
import static java.lang.System.getSecurityManager;
import static java.lang.Thread.currentThread;
import static java.security.AccessController.doPrivileged;
import org.wildfly.security.manager.action.GetContextClassLoaderAction;
import org.wildfly.security.manager.action.SetContextClassLoaderAction;
/**
* @author Richard Opalka
*/
final class TCCLUtils {
private static final ClassLoader SAFE_CL;
static {
ClassLoader safeClassLoader = TCCLUtils.class.getClassLoader();
if (safeClassLoader == null) {
safeClassLoader = ClassLoader.getSystemClassLoader();
}
if (safeClassLoader == null) {
safeClassLoader = new ClassLoader() {
};
}
SAFE_CL = safeClassLoader;
}
private TCCLUtils() {
// forbidden instantiation
}
/**
* Sets safe TCCL and returns previous one.
* @return previous TCCL
*/
static ClassLoader getAndSetSafeTCCL() {
final ClassLoader old;
if (getSecurityManager() != null) {
old = doPrivileged(GetContextClassLoaderAction.getInstance());
doPrivileged(new SetContextClassLoaderAction(SAFE_CL));
} else {
old = currentThread().getContextClassLoader();
currentThread().setContextClassLoader(SAFE_CL);
}
return old;
}
/**
* Resets TCCL to previous one.
*/
static void resetTCCL(final ClassLoader old) {
if (getSecurityManager() != null) {
doPrivileged(new SetContextClassLoaderAction(old));
} else {
currentThread().setContextClassLoader(old);
}
}
}