org.springframework.integration.config.annotation.ServiceActivatorAnnotationPostProcessor.java Source code

Introduction

Here is the source code for org.springframework.integration.config.annotation.ServiceActivatorAnnotationPostProcessor.java

Source

/*
 * Copyright 2002-2019 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.integration.config.annotation;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;

import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.handler.AbstractReplyProducingMessageHandler;
import org.springframework.integration.handler.MessageProcessor;
import org.springframework.integration.handler.ReplyProducingMessageHandlerWrapper;
import org.springframework.integration.handler.ServiceActivatingHandler;
import org.springframework.integration.util.MessagingAnnotationUtils;
import org.springframework.messaging.MessageHandler;
import org.springframework.util.StringUtils;

/**
 * Post-processor for Methods annotated with {@link ServiceActivator @ServiceActivator}.
 *
 * @author Mark Fisher
 * @author Gary Russell
 * @author Artem Bilan
 * @author Yilin Wei
 */
public class ServiceActivatorAnnotationPostProcessor
        extends AbstractMethodAnnotationPostProcessor<ServiceActivator> {

    public ServiceActivatorAnnotationPostProcessor(ConfigurableListableBeanFactory beanFactory) {
        super(beanFactory);
        this.messageHandlerAttributes.addAll(Arrays.asList("outputChannel", "requiresReply", "adviceChain"));
    }

    @Override
    protected MessageHandler createHandler(Object bean, Method method, List<Annotation> annotations) {
        AbstractReplyProducingMessageHandler serviceActivator;
        if (AnnotatedElementUtils.isAnnotated(method, Bean.class.getName())) {
            final Object target = resolveTargetBeanFromMethodWithBeanAnnotation(method);
            serviceActivator = extractTypeIfPossible(target, AbstractReplyProducingMessageHandler.class);
            if (serviceActivator == null) {
                if (target instanceof MessageHandler) {
                    /*
                     * Return a reply-producing message handler so that we still get 'produced no reply' messages
                     * and the super class will inject the advice chain to advise the handler method if needed.
                     */
                    return new ReplyProducingMessageHandlerWrapper((MessageHandler) target);
                } else {
                    MessageProcessor<?> messageProcessor = buildLambdaMessageProcessorForBeanMethod(method, target);
                    if (messageProcessor != null) {
                        serviceActivator = new ServiceActivatingHandler(messageProcessor);
                    } else {
                        serviceActivator = new ServiceActivatingHandler(target);
                    }
                }
            } else {
                checkMessageHandlerAttributes(resolveTargetBeanName(method), annotations);
                return (MessageHandler) target;
            }
        } else {
            serviceActivator = new ServiceActivatingHandler(bean, method);
        }

        String requiresReply = MessagingAnnotationUtils.resolveAttribute(annotations, "requiresReply",
                String.class);
        if (StringUtils.hasText(requiresReply)) {
            serviceActivator.setRequiresReply(resolveAttributeToBoolean(requiresReply));
        }

        String isAsync = MessagingAnnotationUtils.resolveAttribute(annotations, "async", String.class);
        if (StringUtils.hasText(isAsync)) {
            serviceActivator.setAsync(resolveAttributeToBoolean(isAsync));
        }

        setOutputChannelIfPresent(annotations, serviceActivator);
        return serviceActivator;
    }

}