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ServiceInvocationHandler.java
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ServiceInvocationHandler.java
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package org.codehaus.xfire.service.binding;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.xfire.MessageContext;
import org.codehaus.xfire.XFireRuntimeException;
import org.codehaus.xfire.exchange.AbstractMessage;
import org.codehaus.xfire.fault.XFireFault;
import org.codehaus.xfire.handler.AbstractHandler;
import org.codehaus.xfire.handler.DefaultFaultHandler;
import org.codehaus.xfire.handler.Phase;
import org.codehaus.xfire.service.Binding;
import org.codehaus.xfire.service.MessageInfo;
import org.codehaus.xfire.service.MessagePartContainer;
import org.codehaus.xfire.service.MessagePartInfo;
import org.codehaus.xfire.service.OperationInfo;
import org.codehaus.xfire.service.Service;
import org.codehaus.xfire.service.invoker.Invoker;
import org.codehaus.xfire.util.stax.JDOMStreamReader;
import org.codehaus.xfire.util.stax.JDOMStreamWriter;
import org.jdom.Element;
import org.jdom.Namespace;
/**
* This class is responsible for taking the parameters on the InMessage,
* invoking the service, then creating an OutMessage.
*
* @author Dan Diephouse
*/
public class ServiceInvocationHandler
extends AbstractHandler
{
private static final Log logger = LogFactory.getLog(AbstractBinding.class.getName());
public ServiceInvocationHandler()
{
super();
setPhase(Phase.SERVICE);
}
public void invoke(final MessageContext context)
throws Exception
{
try
{
// Read in the parameters...
final List params = (List) context.getInMessage().getBody();
// Don't read the operation in until after reading. Otherwise
// it won't work for document style services.
final OperationInfo operation = context.getExchange().getOperation();
// read in the headers
Binding binding = context.getBinding();
MessageInfo msg = AbstractBinding.getIncomingMessageInfo(context);
MessageInfo outMsg = AbstractBinding.getOutgoingMessageInfo(context);
MessagePartContainer headerMsg = binding.getHeaders(msg);
MessagePartContainer outHeaderMsg = null;
if (outMsg != null) outHeaderMsg = binding.getHeaders(outMsg);
final Object[] paramArray = fillInHolders(context, operation, msg, outMsg, headerMsg, outHeaderMsg, params);
context.getInMessage().setBody(paramArray);
readHeaders(context, headerMsg, paramArray);
final Invoker invoker = context.getService().getInvoker();
Runnable runnable = new ServiceRunner()
{
public void run()
{
try
{
sendMessage(context, paramArray, operation, invoker);
}
catch (Exception e)
{
XFireFault fault = XFireFault.createFault(e);
try
{
context.getCurrentPipeline().pause();
context.setProperty(DefaultFaultHandler.EXCEPTION, fault);
context.getCurrentPipeline().handleFault(fault, context);
context.getFaultHandler().invoke(context);
}
catch (Exception e1)
{
logger.warn("Error invoking fault handler.", e1);
}
}
}
};
execute(runnable, context.getService(), operation);
}
catch (XFireRuntimeException e)
{
logger.warn("Error invoking service.", e);
throw new XFireFault("Error invoking service" + (e.getMessage() != null ? ": " + e.getMessage() : ".") , e, XFireFault.SENDER);
}
}
/**
* Run the Runnable which executes our service.
*
* @param runnable
* @param service
* @param operation
*/
protected void execute(Runnable runnable, Service service, OperationInfo operation)
{
Object executor = null;
if (service != null) executor = service.getExecutor();
if (executor == null)
{
if (!operation.isAsync())
{
runnable.run();
}
else
{
Thread opthread = new Thread(runnable);
opthread.start();
}
}
else
{
try
{
Method method = executor.getClass().getMethod("execute", new Class[] { Runnable.class });
method.invoke(executor, new Object[] { runnable });
}
catch (InvocationTargetException e)
{
// Since we catch all the throwables, the only time this will happen
// is when a runtime exception is thrown.
Throwable t = e.getTargetException();
if (t instanceof RuntimeException)
throw (RuntimeException) t;
throw new XFireRuntimeException("Could not invoke executor.", e);
}
catch (Exception e)
{
throw new XFireRuntimeException("Could not invoke executor.", e);
}
}
}
public static Object readHeaders(final MessageContext context,
MessagePartContainer headerMsg,
final Object[] paramArray)
throws XFireFault
{
final List headerInfos = headerMsg.getMessageParts();
Object result = null;
for (Iterator itr = headerInfos.iterator(); itr.hasNext();)
{
MessagePartInfo header = (MessagePartInfo) itr.next();
BindingProvider provider = context.getService().getBindingProvider();
XMLStreamReader headerReader = getXMLStreamReader(context.getInMessage(), header);
// check to see if there is a header to read
if (headerReader == null) continue;
Object headerVal = provider.readParameter(header, headerReader, context);
// why the null check? In case there is a Holder class of some sort there.
if(header.getIndex() == -1)
{
result = headerVal;
}
else
if (paramArray[header.getIndex()] == null)
{
paramArray[header.getIndex()] = headerVal;
}
}
return result;
}
/**
* Looks for holders, instantiates them, then inserts them into the parameters.
* @return
*/
protected Object[] fillInHolders(MessageContext context,
OperationInfo opInfo,
MessageInfo inMsg,
MessageInfo outMsg,
MessagePartContainer headerMsg,
MessagePartContainer outHeaderMsg,
List params) throws XFireFault
{
// Gross hack to calculate the size of the method parameters, minus special
// parameters like MessageContext.
int outSize = 0;
if (outMsg != null)
{
outSize = outMsg.size();
}
int headersNumber = calcuateHeaderSize(headerMsg,outHeaderMsg);
//int total = inMsg.size() + headerMsg.size() + outSize;
int total = inMsg.size() + headersNumber + outSize;
if (outMsg != null){
if ( ( outSize + outHeaderMsg.size()) != 0){
total--;
}
}
// there are no holder classes to fill in
if (total == params.size()) return params.toArray();
Object[] newParams = new Object[total];
List parts = inMsg.getMessageParts();
if (params.size() < parts.size())
throw new XFireFault("Not enough message parts were received for the operation.", XFireFault.SENDER);
for (int i = 0; i < parts.size(); i++)
{
MessagePartInfo part = (MessagePartInfo) parts.get(i);
newParams[part.getIndex()] = params.get(i);
}
// Case for filling in holders - in server mode
if (!AbstractBinding.isClientModeOn(context) && outMsg != null)
{
fillInHolders(outMsg, newParams);
fillInHolders(outHeaderMsg, newParams);
}
return newParams;
}
/**
* @param headerMsg
* @param outHeaderMsg
* @return
*/
private int calcuateHeaderSize(MessagePartContainer headerMsg,
MessagePartContainer outHeaderMsg) {
Set headers = new HashSet();
if (headerMsg != null) {
for (Iterator iter = headerMsg.getMessageParts().iterator(); iter
.hasNext();) {
MessagePartInfo info = (MessagePartInfo) iter.next();
headers.add(info.getName());
}
}
if (outHeaderMsg != null) {
for (Iterator iter = outHeaderMsg.getMessageParts().iterator(); iter
.hasNext();) {
MessagePartInfo info = (MessagePartInfo) iter.next();
headers.add(info.getName());
}
}
return headers.size();
}
/**
* @param msg
* @param newParams
*/
private void fillInHolders(MessagePartContainer msg, Object[] newParams)
{
for (Iterator itr = msg.getMessageParts().iterator(); itr.hasNext();)
{
MessagePartInfo part = (MessagePartInfo) itr.next();
if (part.getIndex() >= 0)
{
try
{
Object holder = part.getTypeClass().newInstance();
newParams[part.getIndex()] = holder;
}
catch (Exception e)
{
throw new XFireRuntimeException("Could not instantiate holder class.", e);
}
}
}
}
/**
* @param context
* @param params
* @param operation
* @param invoker
* @throws Exception
*/
protected void sendMessage(final MessageContext context,
final Object[] params,
final OperationInfo operation,
final Invoker invoker)
throws Exception
{
final Object value = invoker.invoke(operation.getMethod(),
params,
context);
context.setProperty(PostInvocationHandler.RESPONSE_VALUE, value);
}
public static void writeHeaders(MessageContext context, Object responseValue) throws XFireFault, XMLStreamException
{
MessageInfo msgInfo = AbstractBinding.getOutgoingMessageInfo(context);
MessagePartContainer headers = context.getBinding().getHeaders(msgInfo);
if (headers.size() == 0) return;
Object[] body = (Object[]) context.getCurrentMessage().getBody();
JDOMStreamWriter writer = new JDOMStreamWriter(context.getOutMessage().getOrCreateHeader());
for (Iterator itr = headers.getMessageParts().iterator(); itr.hasNext();)
{
MessagePartInfo part = (MessagePartInfo) itr.next();
Object value;
if (part.getIndex() == -1)
value = responseValue;
else
value = body[part.getIndex()];
AbstractBinding.writeParameter(writer,
context,
value,
part,
part.getName().getNamespaceURI());
}
}
private static XMLStreamReader getXMLStreamReader(AbstractMessage msg, MessagePartInfo header)
{
if (msg.getHeader() == null) return null;
QName name = header.getName();
Element el = msg.getHeader().getChild(name.getLocalPart(),
Namespace.getNamespace(name.getNamespaceURI()));
if (el == null) return null;
JDOMStreamReader reader = new JDOMStreamReader(el);
try
{
// position at start_element
reader.next();
}
catch (XMLStreamException e)
{
}
return reader;
}
}