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Merge remote-tracking branch 'origin/jetty-10.0.x' into jetty-11.0.x
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jetty-util/src/main/java/org/eclipse/jetty/util/thread/PrivilegedThreadFactory.java
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// | ||
// ======================================================================== | ||
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others. | ||
// | ||
// This program and the accompanying materials are made available under the | ||
// terms of the Eclipse Public License v. 2.0 which is available at | ||
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0 | ||
// which is available at https://www.apache.org/licenses/LICENSE-2.0. | ||
// | ||
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 | ||
// ======================================================================== | ||
// | ||
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||
package org.eclipse.jetty.util.thread; | ||
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import java.security.AccessController; | ||
import java.security.PrivilegedAction; | ||
import java.util.function.Supplier; | ||
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/** | ||
* Convenience class to ensure that a new Thread is created | ||
* inside a privileged block. | ||
* | ||
* This prevents the Thread constructor | ||
* from pinning the caller's context classloader. This happens | ||
* when the Thread constructor takes a snapshot of the current | ||
* calling context - which contains ProtectionDomains that may | ||
* reference the context classloader - and remembers it for the | ||
* lifetime of the Thread. | ||
*/ | ||
class PrivilegedThreadFactory | ||
{ | ||
/** | ||
* Use a Supplier to make a new thread, calling it within | ||
* a privileged block to prevent classloader pinning. | ||
* | ||
* @param newThreadSupplier a Supplier to create a fresh thread | ||
* @return a new thread, protected from classloader pinning. | ||
*/ | ||
static <T extends Thread> T newThread(Supplier<T> newThreadSupplier) | ||
{ | ||
return AccessController.doPrivileged(new PrivilegedAction<T>() | ||
{ | ||
@Override | ||
public T run() | ||
{ | ||
return newThreadSupplier.get(); | ||
} | ||
}); | ||
} | ||
} |
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