/*
* Copyright 2002-2018 the original author or authors.
*
* Licensed 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.springframework.jca.endpoint;
import javax.resource.ResourceException;
import javax.resource.spi.UnavailableException;
import javax.resource.spi.endpoint.MessageEndpoint;
import javax.transaction.xa.XAResource;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.aop.support.DelegatingIntroductionInterceptor;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
Generic implementation of the JCA 1.7 MessageEndpointFactory interface, providing transaction management capabilities for any kind of message listener object (e.g. MessageListener objects or MessageListener objects. Uses AOP proxies for concrete endpoint instances, simply wrapping
the specified message listener object and exposing all of its implemented
interfaces on the endpoint instance.
Typically used with Spring's GenericMessageEndpointManager, but not tied to it. As a consequence, this endpoint factory could also be used with programmatic endpoint management on a native ResourceAdapter instance.
Author: Juergen Hoeller See Also: Since: 2.5
/**
* Generic implementation of the JCA 1.7
* {@link javax.resource.spi.endpoint.MessageEndpointFactory} interface,
* providing transaction management capabilities for any kind of message
* listener object (e.g. {@link javax.jms.MessageListener} objects or
* {@link javax.resource.cci.MessageListener} objects.
*
* <p>Uses AOP proxies for concrete endpoint instances, simply wrapping
* the specified message listener object and exposing all of its implemented
* interfaces on the endpoint instance.
*
* <p>Typically used with Spring's {@link GenericMessageEndpointManager},
* but not tied to it. As a consequence, this endpoint factory could
* also be used with programmatic endpoint management on a native
* {@link javax.resource.spi.ResourceAdapter} instance.
*
* @author Juergen Hoeller
* @since 2.5
* @see #setMessageListener
* @see #setTransactionManager
* @see GenericMessageEndpointManager
*/
public class GenericMessageEndpointFactory extends AbstractMessageEndpointFactory {
@Nullable
private Object messageListener;
Specify the message listener object that the endpoint should expose (e.g. a MessageListener objects or MessageListener implementation). /**
* Specify the message listener object that the endpoint should expose
* (e.g. a {@link javax.jms.MessageListener} objects or
* {@link javax.resource.cci.MessageListener} implementation).
*/
public void setMessageListener(Object messageListener) {
this.messageListener = messageListener;
}
Return the message listener object for this endpoint.
Since: 5.0
/**
* Return the message listener object for this endpoint.
* @since 5.0
*/
protected Object getMessageListener() {
Assert.state(this.messageListener != null, "No message listener set");
return this.messageListener;
}
Wrap each concrete endpoint instance with an AOP proxy,
exposing the message listener's interfaces as well as the
endpoint SPI through an AOP introduction.
/**
* Wrap each concrete endpoint instance with an AOP proxy,
* exposing the message listener's interfaces as well as the
* endpoint SPI through an AOP introduction.
*/
@Override
public MessageEndpoint createEndpoint(XAResource xaResource) throws UnavailableException {
GenericMessageEndpoint endpoint = (GenericMessageEndpoint) super.createEndpoint(xaResource);
ProxyFactory proxyFactory = new ProxyFactory(getMessageListener());
DelegatingIntroductionInterceptor introduction = new DelegatingIntroductionInterceptor(endpoint);
introduction.suppressInterface(MethodInterceptor.class);
proxyFactory.addAdvice(introduction);
return (MessageEndpoint) proxyFactory.getProxy();
}
Creates a concrete generic message endpoint, internal to this factory.
/**
* Creates a concrete generic message endpoint, internal to this factory.
*/
@Override
protected AbstractMessageEndpoint createEndpointInternal() throws UnavailableException {
return new GenericMessageEndpoint();
}
Private inner class that implements the concrete generic message endpoint,
as an AOP Alliance MethodInterceptor that will be invoked by a proxy.
/**
* Private inner class that implements the concrete generic message endpoint,
* as an AOP Alliance MethodInterceptor that will be invoked by a proxy.
*/
private class GenericMessageEndpoint extends AbstractMessageEndpoint implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation methodInvocation) throws Throwable {
Throwable endpointEx = null;
boolean applyDeliveryCalls = !hasBeforeDeliveryBeenCalled();
if (applyDeliveryCalls) {
try {
beforeDelivery(null);
}
catch (ResourceException ex) {
throw adaptExceptionIfNecessary(methodInvocation, ex);
}
}
try {
return methodInvocation.proceed();
}
catch (Throwable ex) {
endpointEx = ex;
onEndpointException(ex);
throw ex;
}
finally {
if (applyDeliveryCalls) {
try {
afterDelivery();
}
catch (ResourceException ex) {
if (endpointEx == null) {
throw adaptExceptionIfNecessary(methodInvocation, ex);
}
}
}
}
}
private Exception adaptExceptionIfNecessary(MethodInvocation methodInvocation, ResourceException ex) {
if (ReflectionUtils.declaresException(methodInvocation.getMethod(), ex.getClass())) {
return ex;
}
else {
return new InternalResourceException(ex);
}
}
@Override
protected ClassLoader getEndpointClassLoader() {
return getMessageListener().getClass().getClassLoader();
}
}
Internal exception thrown when a ResourceException has been encountered
during the endpoint invocation.
Will only be used if the ResourceAdapter does not invoke the endpoint's beforeDelivery and afterDelivery directly, leaving it up to the concrete endpoint to apply those - and to handle any ResourceExceptions thrown from them.
/**
* Internal exception thrown when a ResourceException has been encountered
* during the endpoint invocation.
* <p>Will only be used if the ResourceAdapter does not invoke the
* endpoint's {@code beforeDelivery} and {@code afterDelivery}
* directly, leaving it up to the concrete endpoint to apply those -
* and to handle any ResourceExceptions thrown from them.
*/
@SuppressWarnings("serial")
public static class InternalResourceException extends RuntimeException {
public InternalResourceException(ResourceException cause) {
super(cause);
}
}
}