org.jboss.ejb.protocol.remote.TCCLUtils Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * 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.jboss.ejb.protocol.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);
        }
    }

}