/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.container.component;
import java.security.Permission;
/**
* <p>Defines a component that holds variables of type {@link ThreadLocal}
* whose value is required by the component to work normally and cannot be recovered.
* This component is mainly used when we want to do a task asynchronously, in that case
* to ensure that the task will be executed in the same conditions as if it would be
* executed synchronously we need to transfer the thread context from the original
* thread to the executor thread.</p>
*
* <p>Warning please note that this interface must be used with caution, only
* the most important components that have {@link ThreadLocal} variables whose value
* cannot be recovered should implement this interface.</p>
*
* @author <a href="mailto:nfilotto@exoplatform.com">Nicolas Filotto</a>
* @version $Id$
*
*/
public interface ThreadContextHolder
{
public static final Permission MANAGE_THREAD_LOCAL = new RuntimePermission("manageThreadLocal");
/**
* Gives the value corresponding to the context of the thread
* @return a new instance of {@link ThreadContext} if there are some
* valuable {@link ThreadLocal} variables to share otherwise <code>null</code>
* is expected
*/
ThreadContext getThreadContext();
}