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/*
* Copyright 2002-2015 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.web.socket.messaging;
import java.util.ArrayList;
import java.util.List;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.SubscribableChannel;
import org.springframework.messaging.handler.MessagingAdviceBean;
import org.springframework.messaging.handler.annotation.support.AnnotationExceptionHandlerMethodResolver;
import org.springframework.messaging.simp.SimpMessageSendingOperations;
import org.springframework.messaging.simp.annotation.support.SimpAnnotationMethodMessageHandler;
import org.springframework.web.method.ControllerAdviceBean;
/**
* A sub-class of {@link SimpAnnotationMethodMessageHandler} to provide support
* for {@link org.springframework.web.bind.annotation.ControllerAdvice
* ControllerAdvice} with global {@code @MessageExceptionHandler} methods.
*
* @author Rossen Stoyanchev
* @since 4.2
*/
public class WebSocketAnnotationMethodMessageHandler extends SimpAnnotationMethodMessageHandler {
public WebSocketAnnotationMethodMessageHandler(SubscribableChannel clientInChannel, MessageChannel clientOutChannel,
SimpMessageSendingOperations brokerTemplate) {
super(clientInChannel, clientOutChannel, brokerTemplate);
}
@Override
public void afterPropertiesSet() {
initControllerAdviceCache();
super.afterPropertiesSet();
}
private void initControllerAdviceCache() {
if (getApplicationContext() == null) {
return;
}
if (logger.isDebugEnabled()) {
logger.debug("Looking for @MessageExceptionHandler mappings: " + getApplicationContext());
}
List<ControllerAdviceBean> controllerAdvice = ControllerAdviceBean.findAnnotatedBeans(getApplicationContext());
AnnotationAwareOrderComparator.sort(controllerAdvice);
initMessagingAdviceCache(MessagingControllerAdviceBean.createFromList(controllerAdvice));
}
private void initMessagingAdviceCache(List<MessagingAdviceBean> beans) {
if (beans == null) {
return;
}
for (MessagingAdviceBean bean : beans) {
Class<?> beanType = bean.getBeanType();
AnnotationExceptionHandlerMethodResolver resolver = new AnnotationExceptionHandlerMethodResolver(beanType);
if (resolver.hasExceptionMappings()) {
registerExceptionHandlerAdvice(bean, resolver);
logger.info("Detected @MessageExceptionHandler methods in " + bean);
}
}
}
/**
* Adapt ControllerAdviceBean to MessagingAdviceBean.
*/
private static class MessagingControllerAdviceBean implements MessagingAdviceBean {
private final ControllerAdviceBean adviceBean;
private MessagingControllerAdviceBean(ControllerAdviceBean adviceBean) {
this.adviceBean = adviceBean;
}
public static List<MessagingAdviceBean> createFromList(List<ControllerAdviceBean> controllerAdvice) {
List<MessagingAdviceBean> messagingAdvice = new ArrayList<MessagingAdviceBean>(controllerAdvice.size());
for (ControllerAdviceBean bean : controllerAdvice) {
messagingAdvice.add(new MessagingControllerAdviceBean(bean));
}
return messagingAdvice;
}
@Override
public Class<?> getBeanType() {
return this.adviceBean.getBeanType();
}
@Override
public Object resolveBean() {
return this.adviceBean.resolveBean();
}
@Override
public boolean isApplicableToBeanType(Class<?> beanType) {
return this.adviceBean.isApplicableToBeanType(beanType);
}
@Override
public int getOrder() {
return this.adviceBean.getOrder();
}
}
}
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