/**
* 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.camel.component.cxf.jaxrs;
import java.lang.reflect.Method;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import org.apache.camel.AsyncCallback;
import org.apache.camel.ExchangePattern;
import org.apache.camel.RuntimeCamelException;
import org.apache.cxf.continuations.Continuation;
import org.apache.cxf.continuations.ContinuationProvider;
import org.apache.cxf.jaxrs.JAXRSInvoker;
import org.apache.cxf.jaxrs.model.OperationResourceInfo;
import org.apache.cxf.message.Exchange;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CxfRsInvoker extends JAXRSInvoker {
private static final Logger LOG = LoggerFactory.getLogger(CxfRsInvoker.class);
private static final String SUSPENED = "org.apache.camel.component.cxf.jaxrs.suspend";
private CxfRsConsumer cxfRsConsumer;
private CxfRsEndpoint endpoint;
public CxfRsInvoker(CxfRsEndpoint endpoint, CxfRsConsumer consumer) {
this.endpoint = endpoint;
this.cxfRsConsumer = consumer;
}
protected Object performInvocation(Exchange cxfExchange, final Object serviceObject, Method method,
Object[] paramArray) throws Exception {
paramArray = insertExchange(method, paramArray, cxfExchange);
OperationResourceInfo ori = cxfExchange.get(OperationResourceInfo.class);
if (ori.isSubResourceLocator()) {
// don't delegate the sub resource locator call to camel processor
return method.invoke(serviceObject, paramArray);
}
Continuation continuation;
if (!endpoint.isSynchronous() && (continuation = getContinuation(cxfExchange)) != null) {
LOG.trace("Calling the Camel async processors.");
return asyncInvoke(cxfExchange, serviceObject, method, paramArray, continuation);
} else {
LOG.trace("Calling the Camel sync processors.");
return syncInvoke(cxfExchange, serviceObject, method, paramArray);
}
}
private Continuation getContinuation(Exchange cxfExchange) {
ContinuationProvider provider =
(ContinuationProvider)cxfExchange.getInMessage().get(ContinuationProvider.class.getName());
return provider == null ? null : provider.getContinuation();
}
private Object asyncInvoke(Exchange cxfExchange, final Object serviceObject, Method method,
Object[] paramArray, final Continuation continuation) throws Exception {
synchronized (continuation) {
if (continuation.isNew()) {
ExchangePattern ep = ExchangePattern.InOut;
if (method.getReturnType() == Void.class) {
ep = ExchangePattern.InOnly;
}
final org.apache.camel.Exchange camelExchange = endpoint.createExchange(ep);
CxfRsBinding binding = endpoint.getBinding();
binding.populateExchangeFromCxfRsRequest(cxfExchange, camelExchange, method, paramArray);
// we want to handle the UoW
cxfRsConsumer.createUoW(camelExchange);
// Now we don't set up the timeout value
LOG.trace("Suspending continuation of exchangeId: {}", camelExchange.getExchangeId());
// TODO Support to set the timeout in case the Camel can't send the response back on time.
// The continuation could be called before the suspend is called
continuation.suspend(0);
cxfExchange.put(SUSPENED, Boolean.TRUE);
cxfRsConsumer.getAsyncProcessor().process(camelExchange, new AsyncCallback() {
public void done(boolean doneSync) {
// make sure the continuation resume will not be called before the suspend method in other thread
synchronized (continuation) {
LOG.trace("Resuming continuation of exchangeId: {}", camelExchange.getExchangeId());
// resume processing after both, sync and async callbacks
continuation.setObject(camelExchange);
continuation.resume();
}
}
});
return null;
}
if (continuation.isResumed()) {
cxfExchange.put(SUSPENED, Boolean.FALSE);
org.apache.camel.Exchange camelExchange = (org.apache.camel.Exchange)continuation.getObject();
try {
return returnResponse(cxfExchange, camelExchange);
} finally {
cxfRsConsumer.doneUoW(camelExchange);
}
}
}
return null;
}
private Object syncInvoke(Exchange cxfExchange, final Object serviceObject, Method method,
Object[] paramArray) throws Exception {
ExchangePattern ep = ExchangePattern.InOut;
if (method.getReturnType() == Void.class) {
ep = ExchangePattern.InOnly;
}
org.apache.camel.Exchange camelExchange = endpoint.createExchange(ep);
CxfRsBinding binding = endpoint.getBinding();
binding.populateExchangeFromCxfRsRequest(cxfExchange, camelExchange, method, paramArray);
// we want to handle the UoW
cxfRsConsumer.createUoW(camelExchange);
try {
cxfRsConsumer.getProcessor().process(camelExchange);
} catch (Exception exception) {
camelExchange.setException(exception);
}
try {
return returnResponse(cxfExchange, camelExchange);
} finally {
cxfRsConsumer.doneUoW(camelExchange);
}
}
private Object returnResponse(Exchange cxfExchange, org.apache.camel.Exchange camelExchange) throws Exception {
if (camelExchange.getException() != null) {
Throwable exception = camelExchange.getException();
Object result = null;
if (exception instanceof RuntimeCamelException) {
// Unwrap the RuntimeCamelException
if (exception.getCause() != null) {
exception = exception.getCause();
}
}
if (exception instanceof WebApplicationException) {
result = ((WebApplicationException)exception).getResponse();
if (result != null) {
return result;
} else {
throw (WebApplicationException)exception;
}
} else {
// Send the exception message back
WebApplicationException webApplicationException = new WebApplicationException(exception, Response.serverError().entity(exception.toString()).build());
throw webApplicationException;
}
}
return endpoint.getBinding().populateCxfRsResponseFromExchange(camelExchange, cxfExchange);
}
}