ThreadMessageContext.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.tuscany.sca.context;

import org.apache.tuscany.sca.invocation.Message;

/**
 * Class for tunnelling a WorkContext through the invocation of a user class.
 *
 * @version $Rev$ $Date$
 */
public final class ThreadMessageContext {

    private static final ThreadLocal<Message> CONTEXT = new ThreadLocal<Message>();

    private ThreadMessageContext() {
    }

    public static Message setMessageContext(Message context) {
        Message old = CONTEXT.get();
        CONTEXT.set(context);
        return old;
    }

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

    /**
     * Removes and state from the current thread to ensure that
     * any associated classloaders can be GCd
     */
    public static void removeMessageContext() {
        CONTEXT.remove();
    }
}