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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.context;
import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.sca.assembly.Endpoint;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.interfacedef.Operation;
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 {
// TUSCANY-3770: Used as a marker for detecting when thread context information can be removed
private static final Message msg = new Message() {
private Map<String, Object> headers = new HashMap<String, Object>();
public void setTo(Endpoint to) {}
public void setOperation(Operation op) {}
public void setMessageID(Object messageId) {}
public void setFrom(EndpointReference from) {}
public <T> void setFaultBody(T fault) {}
public <T> void setBody(T body) {}
public <T> void setBindingContext(T bindingContext) {}
public boolean isFault() {
return false;
}
public Endpoint getTo() {
return null;
}
public Operation getOperation() {
return null;
}
public Object getMessageID() {
return null;
}
public Map<String, Object> getHeaders() {
return headers;
}
public EndpointReference getFrom() {
return null;
}
public <T> T getBody() {
return null;
}
public <T> T getBindingContext() {
return null;
}
};
private static final ThreadLocal<Message> CONTEXT = new ThreadLocal<Message>(){
@Override
protected synchronized Message initialValue() {
return msg;
}
};
private static final ThreadLocal<Message> PREVIOUS_CONTEXT = new ThreadLocal<Message>();
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);
PREVIOUS_CONTEXT.set(old);
// TUSCANY-3770: Remove thread context information when the request invocation has completed
if (context == msg) {
removeMessageContext();
removePreviousMessageContext();
}
return old;
}
/**
* Returns the WorkContext for the current thread.
*
* @return the WorkContext for the current thread
*/
public static Message getMessageContext() {
return CONTEXT.get();
}
public static Message getPreviousMessageContext() {
return PREVIOUS_CONTEXT.get();
}
/**
* Removes any state from the current thread to ensure that
* any associated classloaders can be GCd
*/
// TUSCANY-3770: The thread context information is removed implicitly above
public static void removeMessageContext() {
CONTEXT.remove();
}
//for performance concerns - set to null rather than call remove
public static void removePreviousMessageContext() {
PREVIOUS_CONTEXT.set(null);
}
}
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