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Core Parts of Axis2. This includes Axis2 engine, Client API, Addressing support, etc.,
/*
* 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.axis2.engine;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.xml.namespace.QName;
import org.apache.axiom.soap.RolePlayer;
import org.apache.axiom.soap.SOAPEnvelope;
import org.apache.axiom.soap.SOAPHeaderBlock;
import org.apache.axis2.AxisFault;
import org.apache.axis2.Constants;
import org.apache.axis2.client.async.AxisCallback;
import org.apache.axis2.context.ConfigurationContext;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.context.OperationContext;
import org.apache.axis2.description.AxisOperation;
import org.apache.axis2.description.TransportOutDescription;
import org.apache.axis2.description.WSDL2Constants;
import org.apache.axis2.engine.Handler.InvocationResponse;
import org.apache.axis2.i18n.Messages;
import org.apache.axis2.transport.TransportSender;
import org.apache.axis2.util.CallbackReceiver;
import org.apache.axis2.util.LoggingControl;
import org.apache.axis2.util.MessageContextBuilder;
import org.apache.axis2.util.Utils;
import org.apache.axis2.wsdl.WSDLConstants;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* There is one engine for the Server and the Client. the send() and receive()
* Methods are the basic operations the Sync, Async messageing are build on top.
*/
public class AxisEngine {
/**
* Field log
*/
private static final Log log = LogFactory.getLog(AxisEngine.class);
private static boolean RESUMING_EXECUTION = true;
private static boolean NOT_RESUMING_EXECUTION = false;
private static void checkMustUnderstand(MessageContext msgContext) throws AxisFault {
List unprocessed = null;
SOAPEnvelope envelope = msgContext.getEnvelope();
if (envelope.getHeader() == null) {
return;
}
// Get all the headers targeted to us
Iterator headerBlocks = envelope.getHeader().getHeadersToProcess((RolePlayer)msgContext.getConfigurationContext().getAxisConfiguration().getParameterValue("rolePlayer"));
while (headerBlocks.hasNext()) {
SOAPHeaderBlock headerBlock = (SOAPHeaderBlock) headerBlocks.next();
QName headerName = headerBlock.getQName();
// if this header block has been processed or mustUnderstand isn't
// turned on then its cool
if (headerBlock.isProcessed() || !headerBlock.getMustUnderstand()) {
continue;
}
if (clientHandlerUnderstandsHeader(headerBlock, msgContext)) {
continue;
}
if(LoggingControl.debugLoggingAllowed && log.isDebugEnabled()){
log.debug("MustUnderstand header not processed or registered as understood"+headerName);
}
if(isReceiverMustUnderstandProcessor(msgContext)){
if(unprocessed == null){
unprocessed = new ArrayList();
}
if(!unprocessed.contains(headerName)){
unprocessed.add(headerName);
}
continue;
}
// Oops, throw an appropriate MustUnderstand fault!!
QName faultQName = headerBlock.getVersion().getMustUnderstandFaultCode();
throw new AxisFault(Messages.getMessage("mustunderstandfailed",
headerBlock.getNamespace().getNamespaceURI(),
headerBlock.getLocalName()), faultQName);
}
if(unprocessed !=null && unprocessed.size()>0){
//Adding HeaderQNames that failed MU check as AxisService Parameter
//They will be examined later by MessageReceivers.
if(log.isDebugEnabled()){
log.debug("Adding Unprocessed headers to MessageContext.");
}
msgContext.setProperty(Constants.UNPROCESSED_HEADER_QNAMES, unprocessed);
}
}
private static boolean isReceiverMustUnderstandProcessor(MessageContext msgContext){
MessageReceiver receiver = null;
if(msgContext.isServerSide()){
receiver = msgContext.getAxisOperation().getMessageReceiver();
}
return (receiver!=null && receiver.getClass().getName().endsWith("JAXWSMessageReceiver"));
}
/**
* This methods represents the inflow of the Axis, this could be either at the server side or the client side.
* Here the ExecutionChain is created using the Phases. The Handlers at the each Phases is ordered in
* deployment time by the deployment module
*
* @throws AxisFault
* @see MessageContext
* @see Phase
* @see Handler
*/
public static InvocationResponse receive(MessageContext msgContext) throws AxisFault {
if (LoggingControl.debugLoggingAllowed && log.isTraceEnabled()) {
log.trace(msgContext.getLogIDString() + " receive:" + msgContext.getMessageID());
}
ConfigurationContext confContext = msgContext.getConfigurationContext();
List preCalculatedPhases;
if (msgContext.isFault() || msgContext.isProcessingFault()) {
preCalculatedPhases = confContext.getAxisConfiguration().getInFaultFlowPhases();
msgContext.setFLOW(MessageContext.IN_FAULT_FLOW);
} else {
preCalculatedPhases = confContext.getAxisConfiguration().getInFlowPhases();
msgContext.setFLOW(MessageContext.IN_FLOW);
}
// Set the initial execution chain in the MessageContext to a *copy* of what
// we got above. This allows individual message processing to change the chain without
// affecting later messages.
ArrayList executionChain = new ArrayList();
executionChain.addAll(preCalculatedPhases);
msgContext.setExecutionChain(executionChain);
try {
InvocationResponse pi = invoke(msgContext, NOT_RESUMING_EXECUTION);
if (pi.equals(InvocationResponse.CONTINUE)) {
checkMustUnderstand(msgContext);
if (msgContext.isServerSide()) {
// invoke the Message Receivers
MessageReceiver receiver = msgContext.getAxisOperation().getMessageReceiver();
if (receiver == null) {
throw new AxisFault(Messages.getMessage(
"nomessagereciever",
msgContext.getAxisOperation().getName().toString()));
}
receiver.receive(msgContext);
}
flowComplete(msgContext);
} else if (pi.equals(InvocationResponse.SUSPEND)) {
return pi;
} else if (pi.equals(InvocationResponse.ABORT)) {
flowComplete(msgContext);
// Undo any partial work.
// Remove the incoming message context
if (log.isDebugEnabled()) {
log.debug("InvocationResponse is aborted. " +
"The incoming MessageContext is removed, " +
"and the OperationContext is marked as incomplete");
}
AxisOperation axisOp = msgContext.getAxisOperation();
if(axisOp!=null){
String mepURI = axisOp.getMessageExchangePattern();
if (WSDL2Constants.MEP_URI_OUT_IN.equals(mepURI)) {
OperationContext opCtx = msgContext.getOperationContext();
if (opCtx != null) {
opCtx.removeMessageContext(WSDLConstants.MESSAGE_LABEL_IN_VALUE);
}
}
}
else{
log.debug("Could not clean up op ctx for " + msgContext);
}
return pi;
} else {
String errorMsg =
"Unrecognized InvocationResponse encountered in AxisEngine.receive()";
log.error(msgContext.getLogIDString() + " " + errorMsg);
throw new AxisFault(errorMsg);
}
}
catch (AxisFault e) {
// log the fault only if it is not an application level fault.
if (e.getFaultType() != Constants.APPLICATION_FAULT) {
log.error(e.getMessage(), e);
}
msgContext.setFailureReason(e);
flowComplete(msgContext);
throw e;
}
return InvocationResponse.CONTINUE;
}
/**
* Take the execution chain from the msgContext , and then take the current Index
* and invoke all the phases in the arraylist
* if the msgContext is pauesd then the execution will be breaked
*
* @param msgContext
* @return An InvocationResponse that indicates what
* the next step in the message processing should be.
* @throws AxisFault
*/
private static InvocationResponse invoke(MessageContext msgContext, boolean resuming)
throws AxisFault {
if (msgContext.getCurrentHandlerIndex() == -1) {
msgContext.setCurrentHandlerIndex(0);
}
InvocationResponse pi = InvocationResponse.CONTINUE;
while (msgContext.getCurrentHandlerIndex() < msgContext.getExecutionChain().size()) {
Handler currentHandler = (Handler) msgContext.getExecutionChain().
get(msgContext.getCurrentHandlerIndex());
try {
if (!resuming) {
msgContext.addExecutedPhase(currentHandler);
} else {
/* If we are resuming the flow, we don't want to add the phase
* again, as it has already been added.
*/
resuming = false;
}
pi = currentHandler.invoke(msgContext);
}
catch (AxisFault e) {
if (msgContext.getCurrentPhaseIndex() == 0) {
/* If we got a fault, we still want to add the phase to the
list to be executed for flowComplete(...) unless this was
the first handler, as then the currentPhaseIndex will be
set to 0 and this will look like we've executed all of the
handlers. If, at some point, a phase really needs to get
notification of flowComplete, then we'll need to introduce
some more complex logic to keep track of what has been
executed.*/
msgContext.removeFirstExecutedPhase();
}
throw e;
}
if (pi.equals(InvocationResponse.SUSPEND) ||
pi.equals(InvocationResponse.ABORT)) {
break;
}
msgContext.setCurrentHandlerIndex(msgContext.getCurrentHandlerIndex() + 1);
}
return pi;
}
private static void flowComplete(MessageContext msgContext) {
Iterator invokedPhaseIterator = msgContext.getExecutedPhases();
while (invokedPhaseIterator.hasNext()) {
Handler currentHandler = ((Handler) invokedPhaseIterator.next());
currentHandler.flowComplete(msgContext);
}
/*This is needed because the OutInAxisOperation currently invokes
* receive() even when a fault occurs, and we will have already executed
* the flowComplete on those before receiveFault() is called.
*/
msgContext.resetExecutedPhases();
}
/**
* If the msgConetext is puased and try to invoke then
* first invoke the phase list and after the message receiver
*
* @param msgContext
* @return An InvocationResponse allowing the invoker to perhaps determine
* whether or not the message processing will ever succeed.
* @throws AxisFault
*/
public static InvocationResponse resumeReceive(MessageContext msgContext) throws AxisFault {
if (LoggingControl.debugLoggingAllowed && log.isTraceEnabled()) {
log.trace(msgContext.getLogIDString() + " resumeReceive:" + msgContext.getMessageID());
}
//REVIEW: This name is a little misleading, as it seems to indicate that there should be a resumeReceiveFault as well, when, in fact, this does both
//REVIEW: Unlike with receive, there is no wrapping try/catch clause which would
//fire off the flowComplete on an error, as we have to assume that the
//message will be resumed again, but perhaps we need to unwind back to
//the point at which the message was resumed and provide another API
//to allow the full unwind if the message is going to be discarded.
//invoke the phases
InvocationResponse pi = invoke(msgContext, RESUMING_EXECUTION);
//invoking the MR
if (pi.equals(InvocationResponse.CONTINUE)) {
checkMustUnderstand(msgContext);
if (msgContext.isServerSide()) {
// invoke the Message Receivers
MessageReceiver receiver = msgContext.getAxisOperation().getMessageReceiver();
if (receiver == null) {
throw new AxisFault(Messages.getMessage(
"nomessagereciever",
msgContext.getAxisOperation().getName().toString()));
}
receiver.receive(msgContext);
}
flowComplete(msgContext);
}
return pi;
}
/**
* To resume the invocation at the send path , this is neened since it is require to call
* TransportSender at the end
*
* @param msgContext
* @return An InvocationResponse allowing the invoker to perhaps determine
* whether or not the message processing will ever succeed.
* @throws AxisFault
*/
public static InvocationResponse resumeSend(MessageContext msgContext) throws AxisFault {
if (LoggingControl.debugLoggingAllowed && log.isTraceEnabled()) {
log.trace(msgContext.getLogIDString() + " resumeSend:" + msgContext.getMessageID());
}
//REVIEW: This name is a little misleading, as it seems to indicate that there should be a resumeSendFault as well, when, in fact, this does both
//REVIEW: Unlike with send, there is no wrapping try/catch clause which would
//fire off the flowComplete on an error, as we have to assume that the
//message will be resumed again, but perhaps we need to unwind back to
//the point at which the message was resumed and provide another API
//to allow the full unwind if the message is going to be discarded.
//invoke the phases
InvocationResponse pi = invoke(msgContext, RESUMING_EXECUTION);
//Invoking Transport Sender
if (pi.equals(InvocationResponse.CONTINUE)) {
// write the Message to the Wire
TransportOutDescription transportOut = msgContext.getTransportOut();
TransportSender sender = transportOut.getSender();
sender.invoke(msgContext);
flowComplete(msgContext);
}
return pi;
}
/**
* Resume processing of a message.
*
* @param msgctx
* @return An InvocationResponse allowing the invoker to perhaps determine
* whether or not the message processing will ever succeed.
* @throws AxisFault
*/
public static InvocationResponse resume(MessageContext msgctx) throws AxisFault {
if (LoggingControl.debugLoggingAllowed && log.isTraceEnabled()) {
log.trace(msgctx.getLogIDString() + " resume:" + msgctx.getMessageID());
}
msgctx.setPaused(false);
if (msgctx.getFLOW() == MessageContext.IN_FLOW) {
return resumeReceive(msgctx);
} else {
return resumeSend(msgctx);
}
}
/**
* This methods represents the outflow of the Axis, this could be either at the server side or the client side.
* Here the ExecutionChain is created using the Phases. The Handlers at the each Phases is ordered in
* deployment time by the deployment module
*
* @param msgContext
* @throws AxisFault
* @see MessageContext
* @see Phase
* @see Handler
*/
public static void send(MessageContext msgContext) throws AxisFault {
if (LoggingControl.debugLoggingAllowed && log.isTraceEnabled()) {
log.trace(msgContext.getLogIDString() + " send:" + msgContext.getMessageID());
}
// find and invoke the Phases
OperationContext operationContext = msgContext.getOperationContext();
ArrayList executionChain = operationContext.getAxisOperation().getPhasesOutFlow();
//rather than having two steps added both oparation and global chain together
ArrayList outPhases = new ArrayList();
outPhases.addAll(executionChain);
outPhases.addAll(msgContext.getConfigurationContext().getAxisConfiguration().getOutFlowPhases());
msgContext.setExecutionChain(outPhases);
msgContext.setFLOW(MessageContext.OUT_FLOW);
try {
InvocationResponse pi = invoke(msgContext, NOT_RESUMING_EXECUTION);
if (pi.equals(InvocationResponse.CONTINUE)) {
// write the Message to the Wire
TransportOutDescription transportOut = msgContext.getTransportOut();
if (transportOut == null) {
throw new AxisFault("Transport out has not been set");
}
TransportSender sender = transportOut.getSender();
// This boolean property only used in client side fireAndForget invocation
//It will set a property into message context and if some one has set the
//property then transport sender will invoke in a diffrent thread
if (Utils.isClientThreadNonBlockingPropertySet(msgContext)) {
msgContext.getConfigurationContext().getThreadPool().execute(
new TransportNonBlockingInvocationWorker(msgContext, sender));
} else {
sender.invoke(msgContext);
}
//REVIEW: In the case of the TransportNonBlockingInvocationWorker, does this need to wait until that finishes?
flowComplete(msgContext);
} else if (pi.equals(InvocationResponse.SUSPEND)) {
} else if (pi.equals(InvocationResponse.ABORT)) {
flowComplete(msgContext);
} else {
String errorMsg =
"Unrecognized InvocationResponse encountered in AxisEngine.send()";
log.error(msgContext.getLogIDString() + " " + errorMsg);
throw new AxisFault(errorMsg);
}
} catch (AxisFault e) {
msgContext.setFailureReason(e);
flowComplete(msgContext);
throw e;
}
}
/**
* Sends the SOAP Fault to another SOAP node.
*
* @param msgContext
* @throws AxisFault
*/
public static void sendFault(MessageContext msgContext) throws AxisFault {
if (LoggingControl.debugLoggingAllowed && log.isTraceEnabled()) {
log.trace(msgContext.getLogIDString() + " sendFault:" + msgContext.getMessageID());
}
OperationContext opContext = msgContext.getOperationContext();
//FIXME: If this gets paused in the operation-specific phases, the resume is not going to function correctly as the phases will not have all been set
// find and execute the Fault Out Flow Handlers
if (opContext != null) {
AxisOperation axisOperation = opContext.getAxisOperation();
ArrayList faultExecutionChain = axisOperation.getPhasesOutFaultFlow();
//adding both operation specific and global out fault flows.
ArrayList outFaultPhases = new ArrayList();
outFaultPhases.addAll((ArrayList) faultExecutionChain.clone());
msgContext.setExecutionChain((ArrayList) outFaultPhases.clone());
msgContext.setFLOW(MessageContext.OUT_FAULT_FLOW);
try {
InvocationResponse pi = invoke(msgContext, NOT_RESUMING_EXECUTION);
if (pi.equals(InvocationResponse.SUSPEND)) {
log.warn(msgContext.getLogIDString() +
" The resumption of this flow may function incorrectly, as the OutFaultFlow will not be used");
return;
} else if (pi.equals(InvocationResponse.ABORT)) {
flowComplete(msgContext);
return;
} else if (!pi.equals(InvocationResponse.CONTINUE)) {
String errorMsg =
"Unrecognized InvocationResponse encountered in AxisEngine.sendFault()";
log.error(msgContext.getLogIDString() + " " + errorMsg);
throw new AxisFault(errorMsg);
}
}
catch (AxisFault e) {
msgContext.setFailureReason(e);
flowComplete(msgContext);
throw e;
}
}
ArrayList executionChain = new ArrayList(msgContext.getConfigurationContext()
.getAxisConfiguration().getOutFaultFlowPhases());
msgContext.setExecutionChain(executionChain);
msgContext.setFLOW(MessageContext.OUT_FAULT_FLOW);
InvocationResponse pi = invoke(msgContext, NOT_RESUMING_EXECUTION);
if (pi.equals(InvocationResponse.CONTINUE)) {
// Actually send the SOAP Fault
TransportOutDescription transportOut = msgContext.getTransportOut();
if (transportOut == null) {
throw new AxisFault("Transport out has not been set");
}
TransportSender sender = transportOut.getSender();
sender.invoke(msgContext);
flowComplete(msgContext);
} else if (pi.equals(InvocationResponse.SUSPEND)) {
} else if (pi.equals(InvocationResponse.ABORT)) {
flowComplete(msgContext);
} else {
String errorMsg =
"Unrecognized InvocationResponse encountered in AxisEngine.sendFault()";
log.error(msgContext.getLogIDString() + " " + errorMsg);
throw new AxisFault(errorMsg);
}
}
/**
* here we assume that it is resume from an operation level handler
* @param msgContext
* @throws AxisFault
*/
public static void resumeSendFault(MessageContext msgContext) throws AxisFault{
if (LoggingControl.debugLoggingAllowed && log.isTraceEnabled()) {
log.trace(msgContext.getLogIDString() + " resumeSendFault:" + msgContext.getMessageID());
}
OperationContext opContext = msgContext.getOperationContext();
if (opContext != null) {
try {
InvocationResponse pi = invoke(msgContext, RESUMING_EXECUTION);
if (pi.equals(InvocationResponse.SUSPEND)) {
log.warn(msgContext.getLogIDString() +
" The resumption of this flow may function incorrectly, as the OutFaultFlow will not be used");
return;
} else if (pi.equals(InvocationResponse.ABORT)) {
flowComplete(msgContext);
return;
} else if (!pi.equals(InvocationResponse.CONTINUE)) {
String errorMsg =
"Unrecognized InvocationResponse encountered in AxisEngine.sendFault()";
log.error(msgContext.getLogIDString() + " " + errorMsg);
throw new AxisFault(errorMsg);
}
} catch (AxisFault e) {
msgContext.setFailureReason(e);
flowComplete(msgContext);
throw e;
}
}
ArrayList executionChain = new ArrayList(msgContext.getConfigurationContext()
.getAxisConfiguration().getOutFaultFlowPhases());
msgContext.setExecutionChain(executionChain);
msgContext.setFLOW(MessageContext.OUT_FAULT_FLOW);
InvocationResponse pi = invoke(msgContext, NOT_RESUMING_EXECUTION);
if (pi.equals(InvocationResponse.CONTINUE)) {
// Actually send the SOAP Fault
TransportOutDescription transportOut = msgContext.getTransportOut();
if (transportOut == null) {
throw new AxisFault("Transport out has not been set");
}
TransportSender sender = transportOut.getSender();
sender.invoke(msgContext);
flowComplete(msgContext);
} else if (pi.equals(InvocationResponse.SUSPEND)) {
} else if (pi.equals(InvocationResponse.ABORT)) {
flowComplete(msgContext);
} else {
String errorMsg =
"Unrecognized InvocationResponse encountered in AxisEngine.sendFault()";
log.error(msgContext.getLogIDString() + " " + errorMsg);
throw new AxisFault(errorMsg);
}
}
/**
* This class is used when someone invoke a service invocation with two transports
* If we dont create a new thread then the main thread will block untill it gets the
* response . In the case of HTTP transportsender will block untill it gets HTTP 200
* So , main thread also block till transport sender rereases the tread. So there is no
* actual non-blocking. That is why when sending we creat a new thead and send the
* requset via that.
*
* So whole porpose of this class to send the requset via a new thread
*
* way transport.
*/
private static class TransportNonBlockingInvocationWorker implements Runnable {
private MessageContext msgctx;
private TransportSender sender;
public TransportNonBlockingInvocationWorker(MessageContext msgctx,
TransportSender sender) {
this.msgctx = msgctx;
this.sender = sender;
}
public void run() {
try {
sender.invoke(msgctx);
} catch (Exception e) {
log.info(msgctx.getLogIDString() + " " + e.getMessage());
if (msgctx.getProperty(MessageContext.DISABLE_ASYNC_CALLBACK_ON_TRANSPORT_ERROR) ==
null) {
AxisOperation axisOperation = msgctx.getAxisOperation();
if (axisOperation != null) {
MessageReceiver msgReceiver = axisOperation.getMessageReceiver();
if ((msgReceiver != null) && (msgReceiver instanceof CallbackReceiver)) {
Object callback = ((CallbackReceiver) msgReceiver)
.lookupCallback(msgctx.getMessageID());
if (callback == null) return; // TODO: should we log this??
// The AxisCallback (which is OutInAxisOperationClient$SyncCallBack
// used to support async-on-the-wire under a synchronous API
// operation) need to be told the MEP is complete after being told
// of the error.
((AxisCallback)callback).onError(e);
((AxisCallback)callback).onComplete();
}
}
}
}
}
}
/**
* Answer if an application handler (such as a JAXWS application handler) has registered that
* it understands this header. Note that the handlers do this registration only on the
* service-requester side. That is because on the service-provider side the handlers have
* not been instantiated at this point so can not be queried yet.
* @param headerBlock Contains the SOAP header to check
* @param messageContext Contains the inbound message context
* @return true if this header QName is registered as being understood or false otherwise.
*/
private static boolean clientHandlerUnderstandsHeader(SOAPHeaderBlock headerBlock,
MessageContext messageContext) {
boolean headerUnderstood = false;
// Get the property off the outbound context, if it exists and contains this header
// then it is understood
QName headerQName = headerBlock.getQName();
Set understoodHeaders = getUnderstoodClientHeaders(messageContext);
if (understoodHeaders != null && understoodHeaders.size() > 0) {
headerUnderstood = understoodHeaders.contains(headerQName);
}
return headerUnderstood;
}
/**
* Get the collection of Header QNames that are registered as being understood.
* This assumes that a Set of QNames which indicates what headers are "understood" by
* this particular client through the client's programming model (i.e. application
* handlers) has been defined and stored on the outbound MessageContext under the
* client.UnderstoodHeaders property.
* @param msgContext The inbound message context
* @return a Set of Header QNames that have been registered as understood, or null if
* none have been registered.
*/
private static Set getUnderstoodClientHeaders(MessageContext msgContext) {
Set returnQN = null;
// The client sets the property on the JAX-WS Request Message Context, which will be copied
// to the Axis2 outbound message context.
OperationContext opCtx = msgContext.getOperationContext();
MessageContext outboundMC = null;
try {
outboundMC = opCtx.getMessageContext(WSDLConstants.MESSAGE_LABEL_OUT_VALUE);
}
catch (AxisFault af) {
// Ignore this; it means that there wasn't an outbound message for this operation.
}
if (outboundMC != null) {
returnQN =
(Set) outboundMC.getProperty("client.UnderstoodHeaders");
}
return returnQN;
}
}