spring-kafka HandlerAdapter 源码
spring-kafka HandlerAdapter 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/HandlerAdapter.java
/*
* Copyright 2015-2021 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.listener.adapter;
import org.springframework.messaging.Message;
import org.springframework.messaging.handler.invocation.InvocableHandlerMethod;
/**
* A wrapper for either an {@link InvocableHandlerMethod} or
* {@link DelegatingInvocableHandler}. All methods delegate to the
* underlying handler.
*
* @author Gary Russell
*
*/
public class HandlerAdapter {
private final InvocableHandlerMethod invokerHandlerMethod;
private final DelegatingInvocableHandler delegatingHandler;
/**
* Construct an instance with the provided method.
* @param invokerHandlerMethod the method.
*/
public HandlerAdapter(InvocableHandlerMethod invokerHandlerMethod) {
this.invokerHandlerMethod = invokerHandlerMethod;
this.delegatingHandler = null;
}
/**
* Construct an instance with the provided delegating handler.
* @param delegatingHandler the handler.
*/
public HandlerAdapter(DelegatingInvocableHandler delegatingHandler) {
this.invokerHandlerMethod = null;
this.delegatingHandler = delegatingHandler;
}
public Object invoke(Message<?> message, Object... providedArgs) throws Exception { //NOSONAR
if (this.invokerHandlerMethod != null) {
return this.invokerHandlerMethod.invoke(message, providedArgs); // NOSONAR
}
else if (this.delegatingHandler.hasDefaultHandler()) {
// Needed to avoid returning raw Message which matches Object
Object[] args = new Object[providedArgs.length + 1];
args[0] = message.getPayload();
System.arraycopy(providedArgs, 0, args, 1, providedArgs.length);
return this.delegatingHandler.invoke(message, args);
}
else {
return this.delegatingHandler.invoke(message, providedArgs);
}
}
public String getMethodAsString(Object payload) {
if (this.invokerHandlerMethod != null) {
return this.invokerHandlerMethod.getMethod().toGenericString();
}
else {
return this.delegatingHandler.getMethodNameFor(payload);
}
}
public Object getBean() {
if (this.invokerHandlerMethod != null) {
return this.invokerHandlerMethod.getBean();
}
else {
return this.delegatingHandler.getBean();
}
}
}
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