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package com.sun.xml.ws.handler;
import com.sun.istack.Nullable;
import com.sun.xml.ws.api.message.Packet;
import com.sun.xml.ws.api.model.wsdl.WSDLPort;
import com.sun.xml.ws.api.pipe.*;
import com.sun.xml.ws.api.pipe.helper.AbstractFilterTubeImpl;
import javax.xml.ws.handler.MessageContext;
import javax.xml.ws.handler.Handler;
import java.util.List;
/**
* @author WS Development team
*/
public abstract class HandlerTube extends AbstractFilterTubeImpl {
/**
* handle hold reference to other Tube for inter-tube communication
*/
HandlerTube cousinTube;
protected List handlers;
HandlerProcessor processor;
boolean remedyActionTaken = false;
protected final @Nullable WSDLPort port;
// flag used to decide whether to call close on cousinTube
boolean requestProcessingSucessful = false;
// TODO: For closing in Exceptions this is needed
// This is used for creating MessageContext in #close
Packet packet;
public HandlerTube(Tube next, WSDLPort port) {
super(next);
this.port = port;
}
public HandlerTube(Tube next, HandlerTube cousinTube) {
super(next);
this.cousinTube = cousinTube;
if(cousinTube != null) {
this.port = cousinTube.port;
} else {
this.port = null;
}
}
/**
* Copy constructor for {@link Tube#copy(TubeCloner)}.
*/
protected HandlerTube(HandlerTube that, TubeCloner cloner) {
super(that,cloner);
if(that.cousinTube != null) {
this.cousinTube = cloner.copy(that.cousinTube);
}
this.port = that.port;
}
@Override
public NextAction processRequest(Packet request) {
this.packet = request;
setupExchange();
// This check is done to cover handler returning false in Oneway request
if (isHandleFalse()) {
// Cousin HandlerTube returned false during Oneway Request processing.
// Don't call handlers and dispatch the message.
remedyActionTaken = true;
return doInvoke(super.next, packet);
}
// This is done here instead of the constructor, since User can change
// the roles and handlerchain after a stub/proxy is created.
setUpProcessor();
MessageUpdatableContext context = getContext(packet);
boolean isOneWay = checkOneWay(packet);
try {
if (!isHandlerChainEmpty()) {
// Call handlers on Request
boolean handlerResult = callHandlersOnRequest(context, isOneWay);
//Update Packet with user modifications
context.updatePacket();
// two-way case where no message is sent
if (!isOneWay && !handlerResult) {
return doReturnWith(packet);
}
}
requestProcessingSucessful = true;
// Call next Tube
return doInvoke(super.next, packet);
} catch (RuntimeException re) {
if(isOneWay) {
//Eat the exception, its already logged and close the transportBackChannel
if(packet.transportBackChannel != null ) {
packet.transportBackChannel.close();
}
packet.setMessage(null);
return doReturnWith(packet);
} else
throw re;
} finally {
if(!requestProcessingSucessful) {
initiateClosing(context.getMessageContext());
}
}
}
@Override
public NextAction processResponse(Packet response) {
this.packet = response;
MessageUpdatableContext context = getContext(packet);
try {
if (isHandleFalse() || (packet.getMessage() == null)) {
// Cousin HandlerTube returned false during Response processing.
// or it is oneway request
// or handler chain is empty
// Don't call handlers.
return doReturnWith(packet);
}
boolean isFault = isHandleFault(packet);
if (!isHandlerChainEmpty()) {
// Call handlers on Response
callHandlersOnResponse(context, isFault);
}
} finally {
initiateClosing(context.getMessageContext());
}
//Update Packet with user modifications
context.updatePacket();
return doReturnWith(packet);
}
@Override
public NextAction processException(Throwable t) {
try {
return doThrow(t);
} finally {
MessageUpdatableContext context = getContext(packet);
initiateClosing(context.getMessageContext());
/* TODO revisit: commented this out as the modified packet is no longer used
In future if the message is propagated even when an exception
occurs, then uncomment context.updatePacket();
*/
//Update Packet with user modifications
//context.updatePacket();
}
}
/**
* Must be overridden by HandlerTube that drives other handler tubes for processing a message.
* On Client-side: ClientLogicalHandlerTube drives the Handler Processing.
* On Server-side: In case SOAP Binding, ServerMessageHandlerTube drives the Handler Processing.
* In case XML/HTTP Binding, ServerLogicalHandlerTube drives the Handler Processing.
*
*
* If its a top HandlerTube, should override by calling #close(MessaggeContext);
*
*/
protected void initiateClosing(MessageContext mc) {
// Do nothing
}
/**
* Calls close on previously invoked handlers.
* Also, Cleans up any state left over in the Tube instance from the current
* invocation, as Tube instances can be reused after the completion of MEP.
*
* On Client, SOAPHandlers are closed first and then LogicalHandlers
* On Server, LogicalHandlers are closed first and then SOAPHandlers
*/
final public void close(MessageContext msgContext) {
//assuming cousinTube is called if requestProcessingSucessful is true
if (requestProcessingSucessful) {
if (cousinTube != null) {
cousinTube.close(msgContext);
}
}
if (processor != null)
closeHandlers(msgContext);
// Clean up the exchange for next invocation.
exchange = null;
requestProcessingSucessful = false;
}
/**
* On Client, Override by calling #closeClientHandlers(MessageContext mc)
* On Server, Override by calling #closeServerHandlers(MessageContext mc)
* The difference is the order in which they are closed.
* @param mc
*/
abstract void closeHandlers(MessageContext mc);
/**
* Called by close(MessageContext mc) in a Client Handlertube
*/
protected void closeClientsideHandlers(MessageContext msgContext) {
if (processor == null)
return;
if (remedyActionTaken) {
//Close only invoked handlers in the chain
//CLIENT-SIDE
processor.closeHandlers(msgContext, processor.getIndex(), 0);
processor.setIndex(-1);
//reset remedyActionTaken
remedyActionTaken = false;
} else {
//Close all handlers in the chain
//CLIENT-SIDE
processor.closeHandlers(msgContext, handlers.size() - 1, 0);
}
}
/**
* Called by close(MessageContext mc) in a Server Handlertube
*/
protected void closeServersideHandlers(MessageContext msgContext) {
if (processor == null)
return;
if (remedyActionTaken) {
//Close only invoked handlers in the chain
//SERVER-SIDE
processor.closeHandlers(msgContext, processor.getIndex(), handlers.size() - 1);
processor.setIndex(-1);
//reset remedyActionTaken
remedyActionTaken = false;
} else {
//Close all handlers in the chain
//SERVER-SIDE
processor.closeHandlers(msgContext, 0, handlers.size() - 1);
}
}
abstract void callHandlersOnResponse(MessageUpdatableContext context, boolean handleFault);
abstract boolean callHandlersOnRequest(MessageUpdatableContext context, boolean oneWay);
private boolean checkOneWay(Packet packet) {
if (port != null) {
/* we can determine this value from WSDL */
return packet.getMessage().isOneWay(port);
} else {
/*
otherwise use this value as an approximation, since this carries
the appliation's intention --- whether it was invokeOneway vs invoke,etc.
*/
return !(packet.expectReply != null && packet.expectReply);
}
}
abstract void setUpProcessor();
final public boolean isHandlerChainEmpty() {
return handlers.isEmpty();
}
abstract MessageUpdatableContext getContext(Packet p);
private boolean isHandleFault(Packet packet) {
if (cousinTube != null) {
return exchange.isHandleFault();
} else {
boolean isFault = packet.getMessage().isFault();
exchange.setHandleFault(isFault);
return isFault;
}
}
final void setHandleFault() {
exchange.setHandleFault(true);
}
private boolean isHandleFalse() {
return exchange.isHandleFalse();
}
final void setHandleFalse() {
exchange.setHandleFalse();
}
private void setupExchange() {
if(exchange == null) {
exchange = new HandlerTubeExchange();
if(cousinTube != null) {
cousinTube.exchange = exchange;
}
} else {
if(cousinTube != null) {
cousinTube.exchange = exchange;
}
}
}
private HandlerTubeExchange exchange;
/**
* This class is used primarily to exchange information or status between
* LogicalHandlerTube and SOAPHandlerTube
*/
static final class HandlerTubeExchange {
private boolean handleFalse;
private boolean handleFault;
boolean isHandleFault() {
return handleFault;
}
void setHandleFault(boolean isFault) {
this.handleFault = isFault;
}
public boolean isHandleFalse() {
return handleFalse;
}
void setHandleFalse() {
this.handleFalse = true;
}
}
}
