org.springframework.kafka.config.MultiMethodKafkaListenerEndpoint Maven / Gradle / Ivy
/*
* Copyright 2016-2019 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
*
* https://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.kafka.config;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.springframework.kafka.listener.adapter.DelegatingInvocableHandler;
import org.springframework.kafka.listener.adapter.HandlerAdapter;
import org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter;
import org.springframework.lang.Nullable;
import org.springframework.messaging.handler.invocation.InvocableHandlerMethod;
/**
* The {@link MethodKafkaListenerEndpoint} extension for several POJO methods
* based on the {@link org.springframework.kafka.annotation.KafkaHandler}.
*
* @param the key type.
* @param the value type.
*
* @author Gary Russell
*
* @see org.springframework.kafka.annotation.KafkaHandler
* @see DelegatingInvocableHandler
*/
public class MultiMethodKafkaListenerEndpoint extends MethodKafkaListenerEndpoint {
private final List methods;
private final Method defaultMethod;
/**
* Construct an instance for the provided methods and bean with no default method.
* @param methods the methods.
* @param bean the bean.
*/
public MultiMethodKafkaListenerEndpoint(List methods, Object bean) {
this(methods, null, bean);
}
/**
* Construct an instance for the provided methods, default method and bean.
* @param methods the methods.
* @param defaultMethod the default method.
* @param bean the bean.
* @since 2.1.3
*/
public MultiMethodKafkaListenerEndpoint(List methods, @Nullable Method defaultMethod, Object bean) {
this.methods = methods;
this.defaultMethod = defaultMethod;
setBean(bean);
}
@Override
protected HandlerAdapter configureListenerAdapter(MessagingMessageListenerAdapter messageListener) {
List invocableHandlerMethods = new ArrayList();
InvocableHandlerMethod defaultHandler = null;
for (Method method : this.methods) {
InvocableHandlerMethod handler = getMessageHandlerMethodFactory()
.createInvocableHandlerMethod(getBean(), method);
invocableHandlerMethods.add(handler);
if (method.equals(this.defaultMethod)) {
defaultHandler = handler;
}
}
DelegatingInvocableHandler delegatingHandler = new DelegatingInvocableHandler(invocableHandlerMethods,
defaultHandler, getBean(), getResolver(), getBeanExpressionContext(), getBeanFactory());
return new HandlerAdapter(delegatingHandler);
}
}