spring BeanFactoryMessageChannelDestinationResolver 源码
spring BeanFactoryMessageChannelDestinationResolver 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/core/BeanFactoryMessageChannelDestinationResolver.java
/*
* Copyright 2002-2017 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.messaging.core;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.lang.Nullable;
import org.springframework.messaging.MessageChannel;
import org.springframework.util.Assert;
/**
* An implementation of {@link DestinationResolver} that interprets a destination
* name as the bean name of a {@link MessageChannel} and looks up the bean in
* the configured {@link BeanFactory}.
*
* @author Mark Fisher
* @since 4.0
*/
public class BeanFactoryMessageChannelDestinationResolver
implements DestinationResolver<MessageChannel>, BeanFactoryAware {
@Nullable
private BeanFactory beanFactory;
/**
* A default constructor that can be used when the resolver itself is configured
* as a Spring bean and will have the {@code BeanFactory} injected as a result
* of ing having implemented {@link BeanFactoryAware}.
*/
public BeanFactoryMessageChannelDestinationResolver() {
}
/**
* A constructor that accepts a {@link BeanFactory} useful if instantiating this
* resolver manually rather than having it defined as a Spring-managed bean.
* @param beanFactory the bean factory to perform lookups against
*/
public BeanFactoryMessageChannelDestinationResolver(BeanFactory beanFactory) {
Assert.notNull(beanFactory, "beanFactory must not be null");
this.beanFactory = beanFactory;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
this.beanFactory = beanFactory;
}
@Override
public MessageChannel resolveDestination(String name) {
Assert.state(this.beanFactory != null, "No BeanFactory configured");
try {
return this.beanFactory.getBean(name, MessageChannel.class);
}
catch (BeansException ex) {
throw new DestinationResolutionException(
"Failed to find MessageChannel bean with name '" + name + "'", ex);
}
}
}
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