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/*
* 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.core.invocation;
import org.apache.tuscany.sca.core.assembly.EndpointReferenceImpl;
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>() {
@Override
protected synchronized Message initialValue() {
Message msg = new MessageImpl();
msg.setFrom(new EndpointReferenceImpl("/"));
return msg;
}
};
private ThreadMessageContext() {
}
/**
* Set the WorkContext for the current thread.
* The current work context is returned and must be restored after the invocation is complete.
* Typical usage would be:
* <pre>
* WorkContext old = PojoWorkContextTunnel.setThreadWorkContext(newContext);
* try {
* ... invoke user code ...
* } finally {
* PojoWorkContextTunnel.setThreadWorkContext(old);
* }
* </pre>
* @param context
* @return the current work context for the thread; this must be restored after the invocation is made
*/
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();
}
}
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