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/*
 * Fabric3
 * Copyright (c) 2009-2011 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
 * you are not obligated to do so. If you do not wish to do so,
 * delete this exception statement from your version.
 *
 * Fabric3 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 General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
 *
 * ----------------------------------------------------
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 *
 */
package org.fabric3.spi.invocation;

/**
 * Class for tunneling a WorkContext through the invocation of user code.
 *
 * @version $Rev: 9763 $ $Date: 2011-01-03 00:48:06 +0000 (Mon, 03 Jan 2011) $
 */
public final class WorkContextTunnel {
    private static final ThreadLocal CONTEXT = new ThreadLocal();

    private WorkContextTunnel() {
    }

    /**
     * Set the WorkContext for the current thread. The current work context is returned and must be restored after the invocation is complete. Typical
     * usage is:
     *      *   WorkContext old = WorkContextTunnel.setThreadWorkContext(newContext);
     *   try {
     *      ... invoke user code ...
     *   } finally {
     *      WorkContextTunnel.setThreadWorkContext(old);
     *   }
     * 
     *
     * @param context the current work context to tunnel
     * @return the current work context for the thread; this must be restored after the invocation is made
     */
    public static WorkContext setThreadWorkContext(WorkContext context) {
        WorkContext old = CONTEXT.get();
        CONTEXT.set(context);
        return old;
    }

    /**
     * Returns the WorkContext for the current thread.
     *
     * @return the WorkContext for the current thread
     */
    public static WorkContext getThreadWorkContext() {
        return CONTEXT.get();
    }
}