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Axis2 JAXWS Implementation
/*
* 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.jaxws.client.async;
import org.apache.axis2.java.security.AccessController;
import org.apache.axis2.jaxws.ExceptionFactory;
import org.apache.axis2.jaxws.core.MessageContext;
import org.apache.axis2.jaxws.description.EndpointDescription;
import org.apache.axis2.jaxws.handler.AttachmentsAdapter;
import org.apache.axis2.jaxws.handler.HandlerChainProcessor;
import org.apache.axis2.jaxws.handler.HandlerInvokerUtils;
import org.apache.axis2.jaxws.handler.SOAPHeadersAdapter;
import org.apache.axis2.jaxws.handler.TransportHeadersAdapter;
import org.apache.axis2.jaxws.i18n.Messages;
import org.apache.axis2.jaxws.message.attachments.AttachmentUtils;
import org.apache.axis2.jaxws.spi.Constants;
import org.apache.axis2.jaxws.spi.migrator.ApplicationContextMigratorUtil;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.xml.ws.Response;
import java.security.PrivilegedAction;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CancellationException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* The AsyncResponse class is used to collect the response information from Axis2 and deliver it to
* a JAX-WS client. AsyncResponse implements the javax.xml.ws.Response API that is
* defined in the JAX-WS 2.0 specification. The Response object will contain both the
* object that is returned as the response along with a java.util.Map with the context
* information of the response.
*/
public abstract class AsyncResponse implements Response {
private static final Log log = LogFactory.getLog(AsyncResponse.class);
private boolean cancelled;
private Throwable fault;
private MessageContext faultMessageContext;
private MessageContext response;
private EndpointDescription endpointDescription;
private Map responseContext;
// CountDownLatch is used to track whether we've received and
// processed the async response. For example, the client app
// could be polling on 30 second intervals, and we don't receive
// the async response until the 1:15 mark. In that case, the
// first few polls calling the .get() would hit the latch.await()
// which blocks the thread if the latch count > 0
private CountDownLatch latch;
private boolean cacheValid = false;
private Object cachedObject = null;
// The response business object to be returned
private Object responseObject = null;
// The exception to be returned in the event of a fault or failure in
// processing the response content.
private ExecutionException savedException = null;
protected AsyncResponse(EndpointDescription ed) {
endpointDescription = ed;
latch = new CountDownLatch(1);
}
protected void onError(Throwable flt, MessageContext mc, ClassLoader cl) {
ClassLoader contextCL = (ClassLoader)AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return Thread.currentThread().getContextClassLoader();
}
});
onError(flt, mc);
checkClassLoader(cl, contextCL);
}
/**
* @param flt Throwable fault that occurred
* @param faultCtx MessageContext if fault is a SOAP Fault
*/
protected void onError(Throwable flt, MessageContext faultCtx) {
// Note:
// This code is hardened to prevent a secondary exception from being
// thrown back to the caller of onError. It is likely that a
// thrown exception will cause other errors leading to
// system fragility.
if (log.isDebugEnabled()) {
log.debug("AsyncResponse received a fault.");
}
Throwable t = null;
try {
fault = flt;
faultMessageContext = faultCtx;
if (faultMessageContext != null) {
faultMessageContext.setEndpointDescription(endpointDescription);
} else {
if (log.isDebugEnabled()) {
log.debug("The faultMessageContext is not available because the error likely occurred on" +
" the client and is not the result of a SOAP Fault");
}
}
// Probably a good idea to invalidate the cache
cacheValid = false;
cachedObject = null;
t = processFaultResponse();
} catch (Throwable unexpected) {
// An unexpected error occurred while processing the fault.
// The Response's throwable is set to this unexpected exception.
if (log.isDebugEnabled()) {
log.debug("A secondary exception occurred during onError processing: " +
unexpected);
}
t = unexpected;
}
// JAXWS 4.3.3 conformance bullet says to throw an ExecutionException from here
savedException = new ExecutionException(t);
try {
// Countdown so that the Future object will know that procesing is complete.
latch.countDown();
if (log.isDebugEnabled()) {
log.debug("New latch count = [" + latch.getCount() + "]");
}
} catch (Throwable unexpected) {
// An unexpected error occurred after processing the fault response
// The Response's throwable has already been set to the savedException
if (log.isDebugEnabled()) {
log.debug("A secondary exception occurred during onError processing " +
"after the fault is processed: " + unexpected);
}
}
}
/**
* Check for a valid relationship between unmarshalling classloader and
* Application's current context classloader
* @param cl
* @param contextCL
*/
private void checkClassLoader(final ClassLoader cl, final ClassLoader contextCL) {
// Ensure that the classloader (cl) used for unmarshalling is the same
// or a parent of the current context classloader. Otherwise
// ClassCastExceptions can occur
if(log.isDebugEnabled()) {
log.debug("AsyncResponse ClassLoader is:");
log.debug(cl.toString());
}
if (cl.equals(contextCL)) {
if(log.isDebugEnabled()) {
log.debug("AsyncResponse ClassLoader matches Context ClassLoader");
}
return;
} else {
if(log.isDebugEnabled()) {
log.debug("Context ClassLoader is:");
log.debug(contextCL.toString());
}
ClassLoader parent = getParentClassLoader(contextCL);
while(parent != null) {
if (parent.equals(cl)) {
return;
}
if(log.isDebugEnabled()) {
log.debug("AsyncResponse ClassLoader is an ancestor of the Context ClassLoader");
}
parent = getParentClassLoader(parent);
}
}
throw ExceptionFactory.
makeWebServiceException(Messages.getMessage("threadClsLoaderErr",
contextCL.getClass().toString(), cl.getClass().toString()));
}
ClassLoader getParentClassLoader(final ClassLoader cl) {
return (ClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return cl.getParent();
}
});
}
protected void onComplete(MessageContext mc, ClassLoader cl) {
ClassLoader contextCL = (ClassLoader)AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return Thread.currentThread().getContextClassLoader();
}
});
onComplete(mc);
checkClassLoader(cl, contextCL);
}
protected void onComplete(MessageContext mc) {
if (log.isDebugEnabled()) {
log.debug("AsyncResponse received a MessageContext.");
}
// A new message context invalidates the cached object retrieved
// during the last get()
if (response != mc) {
cachedObject = null;
cacheValid = false;
}
response = mc;
response.setEndpointDescription(endpointDescription);
// Check for cached attachment file(s) if attachments exist.
if (response.getAxisMessageContext().getAttachmentMap() != null){
AttachmentUtils.findCachedAttachment(response.getAxisMessageContext().getAttachmentMap());
}
// Process the response as soon as it is available. This means making sure that
// no content is left unread in the response stream. Leaving content there could
// result in an error if the runtime is greedy about cleaning up.
try {
responseObject = processResponse();
} catch (ExecutionException e) {
savedException = e;
if (log.isDebugEnabled()) {
log.debug("An error occurred while processing the response: " + e.getCause());
}
latch.countDown();
}
// Countdown so that the Future object will know that procesing is complete.
latch.countDown();
if (log.isDebugEnabled()) {
log.debug("New latch count = [" + latch.getCount() + "]");
}
}
//-------------------------------------
// javax.xml.ws.Response APIs
//-------------------------------------
public boolean cancel(boolean mayInterruptIfRunning) {
// The task cannot be cancelled if it has already been cancelled
// before or if it has already completed.
if (cancelled || latch.getCount() == 0) {
if (log.isDebugEnabled()) {
log.debug("Cancellation attempt failed.");
}
return false;
}
cancelled = true;
return cancelled;
}
public Object get() throws InterruptedException, ExecutionException {
if (cancelled) {
throw new CancellationException(Messages.getMessage("getErr"));
}
// Wait for the response to come back
if (log.isDebugEnabled()) {
log.debug("Waiting for async response delivery.");
}
// If latch count > 0, it means we have not yet received
// and processed the async response, and must block the
// thread.
latch.await();
if (savedException != null) {
throw savedException;
}
return responseObject;
}
public Object get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
if (cancelled) {
throw new CancellationException(Messages.getMessage("getErr"));
}
// Wait for the response to come back
if (log.isDebugEnabled()) {
log.debug("Waiting for async response delivery with time out.");
log.debug("timeout = " + timeout);
log.debug("units = " + unit);
}
// latch.await will only block if its count is > 0
latch.await(timeout, unit);
if (savedException != null) {
throw savedException;
}
// If the response still hasn't been returned, then we've timed out
// and must throw a TimeoutException
if (latch.getCount() > 0) {
throw new TimeoutException(Messages.getMessage("getErr1"));
}
return responseObject;
}
public boolean isCancelled() {
return cancelled;
}
public boolean isDone() {
return (latch.getCount() == 0);
}
public Map getContext() {
return responseContext;
}
private Object processResponse() throws ExecutionException {
// If we don't have a fault, then we have to have a MessageContext for the response.
if (response == null) {
latch.countDown();
throw new ExecutionException(ExceptionFactory.makeWebServiceException(Messages.getMessage("processRespErr")));
}
// Avoid a reparse of the message. If we already retrived the object, return
// it now.
if (cacheValid) {
if (log.isDebugEnabled()) {
log.debug("Return object cached from last get()");
}
return cachedObject;
}
Object obj = null;
try {
// Install the adapters and invoke inbound handlers.
TransportHeadersAdapter.install(response);
AttachmentsAdapter.install(response);
SOAPHeadersAdapter.install(response);
HandlerInvokerUtils.invokeInboundHandlers(response.getMEPContext(),
response.getInvocationContext().getHandlers(),
HandlerChainProcessor.MEP.RESPONSE,
false);
// TODO: IMPORTANT: this is the right call here, but beware that the
// messagecontext may be turned into a fault context with a fault message.
// We need to check for this and, if necessary, make an exception and throw it.
if (log.isDebugEnabled()) {
log.debug("Unmarshalling the async response message.");
}
// Do the real work to unmarshall the response.
obj = getResponseValueObject(response);
if (log.isDebugEnabled() && obj != null) {
log.debug("Unmarshalled response object of type: " + obj.getClass());
}
// Cache the object in case it is required again
cacheValid = true;
cachedObject = obj;
responseContext = new HashMap();
// Migrate the properties from the response MessageContext back
// to the client response context bag.
ApplicationContextMigratorUtil.performMigrationFromMessageContext(Constants.APPLICATION_CONTEXT_MIGRATOR_LIST_ID,
responseContext,
response);
} catch (Throwable t) {
throw new ExecutionException(ExceptionFactory.makeWebServiceException(t));
}
return obj;
}
private Throwable processFaultResponse() {
// A faultMessageContext means that there could possibly be a SOAPFault
// on the MessageContext that we need to unmarshall.
if (faultMessageContext != null) {
Throwable throwable = null;
// it is possible the message could be null. For example, if we gave the proxy a bad endpoint address.
// If it is the case that the message is null, there's no sense running through the handlers.
if (faultMessageContext.getMessage() != null) {
// The adapters are intentionally NOT installed here. They cause unit test failures
// TransportHeadersAdapter.install(faultMessageContext);
// AttachmentsAdapter.install(faultMessageContext);
try {
// Invoke inbound handlers.
if (log.isDebugEnabled()) {
log.debug("Invoking the JAX-WS handler chain for the fault response.");
}
HandlerInvokerUtils.invokeInboundHandlers(faultMessageContext.getMEPContext(),
faultMessageContext.getInvocationContext()
.getHandlers(),
HandlerChainProcessor.MEP.RESPONSE,
false);
} catch (Throwable t) {
if (log.isDebugEnabled()) {
log.debug("An error occurred (" + t.getClass() + " while processing " +
"the fault response handler chain.");
}
throwable = t;
}
}
if (throwable == null) {
// Do the real work to unmarshal the fault response.
throwable = getFaultResponse(faultMessageContext);
}
if (throwable != null) {
return throwable;
} else {
return ExceptionFactory.makeWebServiceException(fault);
}
} else {
return ExceptionFactory.makeWebServiceException(fault);
}
}
public abstract Object getResponseValueObject(MessageContext mc);
public abstract Throwable getFaultResponse(MessageContext mc);
}