@Override
protected MessageHandler createHandler(Object bean, Method method, List<Annotation> annotations) {
MessageSelector selector;
if (AnnotatedElementUtils.isAnnotated(method, Bean.class.getName())) {
Object target = this.resolveTargetBeanFromMethodWithBeanAnnotation(method);
if (target instanceof MessageSelector) {
selector = (MessageSelector) target;
} else if (this.extractTypeIfPossible(target, MessageFilter.class) != null) {
checkMessageHandlerAttributes(resolveTargetBeanName(method), annotations);
return (MessageHandler) target;
} else {
selector = new MethodInvokingSelector(target);
}
} else {
Assert.isTrue(
boolean.class.equals(method.getReturnType())
|| Boolean.class.equals(method.getReturnType()),
"The Filter annotation may only be applied to methods with a boolean return type.");
selector = new MethodInvokingSelector(bean, method);
}
MessageFilter filter = new MessageFilter(selector);
String discardWithinAdvice =
MessagingAnnotationUtils.resolveAttribute(annotations, "discardWithinAdvice", String.class);
if (StringUtils.hasText(discardWithinAdvice)) {
discardWithinAdvice = this.environment.resolvePlaceholders(discardWithinAdvice);
if (StringUtils.hasText(discardWithinAdvice)) {
filter.setDiscardWithinAdvice(Boolean.parseBoolean(discardWithinAdvice));
}
}
String throwExceptionOnRejection =
MessagingAnnotationUtils.resolveAttribute(
annotations, "throwExceptionOnRejection", String.class);
if (StringUtils.hasText(throwExceptionOnRejection)) {
String throwExceptionOnRejectionValue =
this.environment.resolvePlaceholders(throwExceptionOnRejection);
if (StringUtils.hasText(throwExceptionOnRejectionValue)) {
filter.setThrowExceptionOnRejection(Boolean.parseBoolean(throwExceptionOnRejectionValue));
}
}
String discardChannelName =
MessagingAnnotationUtils.resolveAttribute(annotations, "discardChannel", String.class);
if (StringUtils.hasText(discardChannelName)) {
filter.setDiscardChannelName(discardChannelName);
}
this.setOutputChannelIfPresent(annotations, filter);
return filter;
}
@SuppressWarnings("unchecked")
protected AbstractEndpoint doCreateEndpoint(
MessageHandler handler, MessageChannel inputChannel, List<Annotation> annotations) {
AbstractEndpoint endpoint;
if (inputChannel instanceof PollableChannel) {
PollingConsumer pollingConsumer =
new PollingConsumer((PollableChannel) inputChannel, handler);
configurePollingEndpoint(pollingConsumer, annotations);
endpoint = pollingConsumer;
} else {
Poller[] pollers =
MessagingAnnotationUtils.resolveAttribute(annotations, "poller", Poller[].class);
Assert.state(
ObjectUtils.isEmpty(pollers),
"A '@Poller' should not be specified for Annotation-based "
+ "endpoint, since '"
+ inputChannel
+ "' is a SubscribableChannel (not pollable).");
if (inputChannel instanceof Publisher) {
Subscriber<Message<?>> subscriber;
if (handler instanceof Subscriber) {
subscriber = (Subscriber<Message<?>>) handler;
} else {
// TODO errorConsumer, completeConsumer
DirectProcessor<Message<?>> directProcessor = DirectProcessor.create();
directProcessor.doOnNext(handler::handleMessage);
subscriber = directProcessor;
}
endpoint = new ReactiveConsumer(inputChannel, subscriber);
} else {
endpoint = new EventDrivenConsumer((SubscribableChannel) inputChannel, handler);
}
}
return endpoint;
}
protected void setOutputChannelIfPresent(
List<Annotation> annotations, AbstractReplyProducingMessageHandler handler) {
String outputChannelName =
MessagingAnnotationUtils.resolveAttribute(annotations, "outputChannel", String.class);
if (StringUtils.hasText(outputChannelName)) {
handler.setOutputChannelName(outputChannelName);
}
}
@Override
public boolean shouldCreateEndpoint(Method method, List<Annotation> annotations) {
String inputChannel =
MessagingAnnotationUtils.resolveAttribute(
annotations, getInputChannelAttribute(), String.class);
boolean createEndpoint = StringUtils.hasText(inputChannel);
if (!createEndpoint && beanAnnotationAware()) {
boolean isBean = AnnotatedElementUtils.isAnnotated(method, Bean.class.getName());
Assert.isTrue(
!isBean,
"A channel name in '"
+ getInputChannelAttribute()
+ "' is required when "
+ this.annotationType
+ " is used on '@Bean' methods.");
}
return createEndpoint;
}
protected AbstractEndpoint createEndpoint(
MessageHandler handler, Method method, List<Annotation> annotations) {
AbstractEndpoint endpoint = null;
String inputChannelName =
MessagingAnnotationUtils.resolveAttribute(
annotations, getInputChannelAttribute(), String.class);
if (StringUtils.hasText(inputChannelName)) {
MessageChannel inputChannel;
try {
inputChannel = this.channelResolver.resolveDestination(inputChannelName);
} catch (DestinationResolutionException e) {
inputChannel = new DirectChannel();
this.beanFactory.registerSingleton(inputChannelName, inputChannel);
inputChannel =
(MessageChannel) this.beanFactory.initializeBean(inputChannel, inputChannelName);
}
Assert.notNull(inputChannel, "failed to resolve inputChannel '" + inputChannelName + "'");
endpoint = doCreateEndpoint(handler, inputChannel, annotations);
}
return endpoint;
}
protected void checkMessageHandlerAttributes(
String handlerBeanName, List<Annotation> annotations) {
for (String attribute : this.messageHandlerAttributes) {
for (Annotation annotation : annotations) {
Object value = AnnotationUtils.getValue(annotation, attribute);
if (MessagingAnnotationUtils.hasValue(value)) {
throw new BeanDefinitionValidationException(
"The MessageHandler ["
+ handlerBeanName
+ "] can not"
+ " be populated because of ambiguity with annotation attributes "
+ this.messageHandlerAttributes
+ " which are not allowed when an integration annotation "
+ "is used with a @Bean definition for a MessageHandler."
+ "\nThe attribute causing the ambiguity is: ["
+ attribute
+ "]."
+ "\nUse the appropriate setter on the MessageHandler directly when configfuring an "
+ "endpoint this way.");
}
}
}
}
private List<Advice> extractAdviceChain(String beanName, List<Annotation> annotations) {
List<Advice> adviceChain = null;
String[] adviceChainNames =
MessagingAnnotationUtils.resolveAttribute(
annotations, ADVICE_CHAIN_ATTRIBUTE, String[].class);
/*
* Note: we don't merge advice chain contents; if the directAnnotation has a non-empty
* attribute, it wins. You cannot "remove" an advice chain from a meta-annotation
* by setting an empty array on the custom annotation.
*/
if (adviceChainNames != null && adviceChainNames.length > 0) {
adviceChain = new ArrayList<Advice>();
for (String adviceChainName : adviceChainNames) {
Object adviceChainBean = this.beanFactory.getBean(adviceChainName);
if (adviceChainBean instanceof Advice) {
adviceChain.add((Advice) adviceChainBean);
} else if (adviceChainBean instanceof Advice[]) {
Collections.addAll(adviceChain, (Advice[]) adviceChainBean);
} else if (adviceChainBean instanceof Collection) {
@SuppressWarnings("unchecked")
Collection<Advice> adviceChainEntries = (Collection<Advice>) adviceChainBean;
for (Advice advice : adviceChainEntries) {
adviceChain.add(advice);
}
} else {
throw new IllegalArgumentException(
"Invalid advice chain type:"
+ adviceChainName.getClass().getName()
+ " for bean '"
+ beanName
+ "'");
}
}
}
return adviceChain;
}
protected void configurePollingEndpoint(
AbstractPollingEndpoint pollingEndpoint, List<Annotation> annotations) {
PollerMetadata pollerMetadata = null;
Poller[] pollers =
MessagingAnnotationUtils.resolveAttribute(annotations, "poller", Poller[].class);
if (!ObjectUtils.isEmpty(pollers)) {
Assert.state(
pollers.length == 1,
"The 'poller' for an Annotation-based endpoint can have only one '@Poller'.");
Poller poller = pollers[0];
String ref = poller.value();
String triggerRef = poller.trigger();
String executorRef = poller.taskExecutor();
String fixedDelayValue = this.beanFactory.resolveEmbeddedValue(poller.fixedDelay());
String fixedRateValue = this.beanFactory.resolveEmbeddedValue(poller.fixedRate());
String maxMessagesPerPollValue =
this.beanFactory.resolveEmbeddedValue(poller.maxMessagesPerPoll());
String cron = this.beanFactory.resolveEmbeddedValue(poller.cron());
String errorChannel = this.beanFactory.resolveEmbeddedValue(poller.errorChannel());
if (StringUtils.hasText(ref)) {
Assert.state(
!StringUtils.hasText(triggerRef)
&& !StringUtils.hasText(executorRef)
&& !StringUtils.hasText(cron)
&& !StringUtils.hasText(fixedDelayValue)
&& !StringUtils.hasText(fixedRateValue)
&& !StringUtils.hasText(maxMessagesPerPollValue),
"The '@Poller' 'ref' attribute is mutually exclusive with other attributes.");
pollerMetadata = this.beanFactory.getBean(ref, PollerMetadata.class);
} else {
pollerMetadata = new PollerMetadata();
if (StringUtils.hasText(maxMessagesPerPollValue)) {
pollerMetadata.setMaxMessagesPerPoll(Long.parseLong(maxMessagesPerPollValue));
} else if (pollingEndpoint instanceof SourcePollingChannelAdapter) {
// SPCAs default to 1 message per poll
pollerMetadata.setMaxMessagesPerPoll(1);
}
if (StringUtils.hasText(executorRef)) {
pollerMetadata.setTaskExecutor(this.beanFactory.getBean(executorRef, TaskExecutor.class));
}
Trigger trigger = null;
if (StringUtils.hasText(triggerRef)) {
Assert.state(
!StringUtils.hasText(cron)
&& !StringUtils.hasText(fixedDelayValue)
&& !StringUtils.hasText(fixedRateValue),
"The '@Poller' 'trigger' attribute is mutually exclusive with other attributes.");
trigger = this.beanFactory.getBean(triggerRef, Trigger.class);
} else if (StringUtils.hasText(cron)) {
Assert.state(
!StringUtils.hasText(fixedDelayValue) && !StringUtils.hasText(fixedRateValue),
"The '@Poller' 'cron' attribute is mutually exclusive with other attributes.");
trigger = new CronTrigger(cron);
} else if (StringUtils.hasText(fixedDelayValue)) {
Assert.state(
!StringUtils.hasText(fixedRateValue),
"The '@Poller' 'fixedDelay' attribute is mutually exclusive with other attributes.");
trigger = new PeriodicTrigger(Long.parseLong(fixedDelayValue));
} else if (StringUtils.hasText(fixedRateValue)) {
trigger = new PeriodicTrigger(Long.parseLong(fixedRateValue));
((PeriodicTrigger) trigger).setFixedRate(true);
}
// 'Trigger' can be null. 'PollingConsumer' does fallback to the 'new PeriodicTrigger(10)'.
pollerMetadata.setTrigger(trigger);
if (StringUtils.hasText(errorChannel)) {
MessagePublishingErrorHandler errorHandler = new MessagePublishingErrorHandler();
errorHandler.setDefaultErrorChannelName(errorChannel);
errorHandler.setBeanFactory(this.beanFactory);
pollerMetadata.setErrorHandler(errorHandler);
}
}
} else {
pollerMetadata = PollerMetadata.getDefaultPollerMetadata(this.beanFactory);
Assert.notNull(
pollerMetadata,
"No poller has been defined for Annotation-based endpoint, "
+ "and no default poller is available within the context.");
}
pollingEndpoint.setTaskExecutor(pollerMetadata.getTaskExecutor());
pollingEndpoint.setTrigger(pollerMetadata.getTrigger());
pollingEndpoint.setAdviceChain(pollerMetadata.getAdviceChain());
pollingEndpoint.setMaxMessagesPerPoll(pollerMetadata.getMaxMessagesPerPoll());
pollingEndpoint.setErrorHandler(pollerMetadata.getErrorHandler());
if (pollingEndpoint instanceof PollingConsumer) {
((PollingConsumer) pollingEndpoint).setReceiveTimeout(pollerMetadata.getReceiveTimeout());
}
pollingEndpoint.setTransactionSynchronizationFactory(
pollerMetadata.getTransactionSynchronizationFactory());
}
@Override
public Object postProcess(
Object bean, String beanName, Method method, List<Annotation> annotations) {
if (this.beanAnnotationAware()
&& AnnotatedElementUtils.isAnnotated(method, Bean.class.getName())) {
try {
resolveTargetBeanFromMethodWithBeanAnnotation(method);
} catch (NoSuchBeanDefinitionException e) {
if (this.logger.isDebugEnabled()) {
this.logger.debug(
"Skipping endpoint creation; "
+ e.getMessage()
+ "; perhaps due to some '@Conditional' annotation.");
}
return null;
}
}
List<Advice> adviceChain = extractAdviceChain(beanName, annotations);
MessageHandler handler = createHandler(bean, method, annotations);
if (!CollectionUtils.isEmpty(adviceChain)
&& handler instanceof AbstractReplyProducingMessageHandler) {
((AbstractReplyProducingMessageHandler) handler).setAdviceChain(adviceChain);
}
if (handler instanceof Orderable) {
Order orderAnnotation = AnnotationUtils.findAnnotation(method, Order.class);
if (orderAnnotation != null) {
((Orderable) handler).setOrder(orderAnnotation.value());
}
}
if (handler instanceof AbstractMessageProducingHandler
|| handler instanceof AbstractMessageRouter) {
String sendTimeout =
MessagingAnnotationUtils.resolveAttribute(annotations, "sendTimeout", String.class);
if (sendTimeout != null) {
Long value = Long.valueOf(this.beanFactory.resolveEmbeddedValue(sendTimeout));
if (handler instanceof AbstractMessageProducingHandler) {
((AbstractMessageProducingHandler) handler).setSendTimeout(value);
} else {
((AbstractMessageRouter) handler).setSendTimeout(value);
}
}
}
boolean handlerExists = false;
if (this.beanAnnotationAware()
&& AnnotatedElementUtils.isAnnotated(method, Bean.class.getName())) {
Object handlerBean = this.resolveTargetBeanFromMethodWithBeanAnnotation(method);
handlerExists = handlerBean != null && handler == handlerBean;
}
if (!handlerExists) {
String handlerBeanName = generateHandlerBeanName(beanName, method);
this.beanFactory.registerSingleton(handlerBeanName, handler);
handler = (MessageHandler) this.beanFactory.initializeBean(handler, handlerBeanName);
}
if (AnnotatedElementUtils.isAnnotated(method, IdempotentReceiver.class.getName())
&& !AnnotatedElementUtils.isAnnotated(method, Bean.class.getName())) {
String[] interceptors =
AnnotationUtils.getAnnotation(method, IdempotentReceiver.class).value();
for (String interceptor : interceptors) {
DefaultBeanFactoryPointcutAdvisor advisor = new DefaultBeanFactoryPointcutAdvisor();
advisor.setAdviceBeanName(interceptor);
NameMatchMethodPointcut pointcut = new NameMatchMethodPointcut();
pointcut.setMappedName("handleMessage");
advisor.setPointcut(pointcut);
advisor.setBeanFactory(this.beanFactory);
if (handler instanceof Advised) {
((Advised) handler).addAdvisor(advisor);
} else {
ProxyFactory proxyFactory = new ProxyFactory(handler);
proxyFactory.addAdvisor(advisor);
handler = (MessageHandler) proxyFactory.getProxy(this.beanFactory.getBeanClassLoader());
}
}
}
if (!CollectionUtils.isEmpty(adviceChain)) {
for (Advice advice : adviceChain) {
if (advice instanceof HandleMessageAdvice) {
NameMatchMethodPointcutAdvisor handlerAdvice = new NameMatchMethodPointcutAdvisor(advice);
handlerAdvice.addMethodName("handleMessage");
if (handler instanceof Advised) {
((Advised) handler).addAdvisor(handlerAdvice);
} else {
ProxyFactory proxyFactory = new ProxyFactory(handler);
proxyFactory.addAdvisor(handlerAdvice);
handler = (MessageHandler) proxyFactory.getProxy(this.beanFactory.getBeanClassLoader());
}
}
}
}
AbstractEndpoint endpoint = createEndpoint(handler, method, annotations);
if (endpoint != null) {
return endpoint;
}
return handler;
}
