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108 changes: 108 additions & 0 deletions
108
...ion-core/src/main/java/org/springframework/integration/config/xml/ChannelInitializer.java
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| /* | ||
| * Copyright 2002-2012 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.integration.config.xml; | ||
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| import java.util.Collection; | ||
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| import org.apache.commons.logging.Log; | ||
| import org.apache.commons.logging.LogFactory; | ||
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| import org.springframework.beans.BeansException; | ||
| import org.springframework.beans.factory.BeanFactory; | ||
| import org.springframework.beans.factory.BeanFactoryAware; | ||
| import org.springframework.beans.factory.InitializingBean; | ||
| import org.springframework.beans.factory.config.BeanDefinitionHolder; | ||
| import org.springframework.beans.factory.support.BeanDefinitionReaderUtils; | ||
| import org.springframework.beans.factory.support.BeanDefinitionRegistry; | ||
| import org.springframework.beans.factory.support.RootBeanDefinition; | ||
| import org.springframework.integration.channel.DirectChannel; | ||
| import org.springframework.util.Assert; | ||
|
|
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| /** | ||
| * A {@link InitializingBean} implementation that is responsible for creating | ||
| * channels that are not explicitly defined but identified via the 'input-channel' | ||
| * attribute of the corresponding endpoints. | ||
| * | ||
| * This bean plays a role of pre-instantiator since it is instantiated and | ||
| * initialized as the very first bean of all SI beans using | ||
| * {@link AbstractIntegrationNamespaceHandler}. | ||
| * | ||
| * @author Oleg Zhurakousky | ||
| * @since 2.1.1 | ||
| */ | ||
| final class ChannelInitializer implements BeanFactoryAware, InitializingBean { | ||
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| public static String AUTO_CREATE_CHANNEL_CANDIDATES_BEAN_NAME = "$autoCreateChannelCandidates"; | ||
| public static String CHANNEL_NAMES_ATTR = "channelNames"; | ||
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| private Log logger = LogFactory.getLog(this.getClass()); | ||
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| private volatile BeanFactory beanFactory; | ||
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| private volatile boolean autoCreate = true; | ||
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| public void setAutoCreate(boolean autoCreate) { | ||
| this.autoCreate = autoCreate; | ||
| } | ||
|
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| public void setBeanFactory(BeanFactory beanFactory) throws BeansException { | ||
| this.beanFactory = beanFactory; | ||
| } | ||
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| public void afterPropertiesSet() throws Exception { | ||
| Assert.notNull(this.beanFactory, "'beanFactory' must not be null"); | ||
| if (!autoCreate){ | ||
| return; | ||
| } | ||
| else { | ||
| AutoCreateCandidatesCollector channelCandidatesCollector = | ||
| (AutoCreateCandidatesCollector) beanFactory.getBean(AUTO_CREATE_CHANNEL_CANDIDATES_BEAN_NAME, AutoCreateCandidatesCollector.class); | ||
| Assert.notNull(channelCandidatesCollector, "Failed to locate '" + | ||
| ChannelInitializer.AUTO_CREATE_CHANNEL_CANDIDATES_BEAN_NAME); | ||
| // at this point channelNames are all resolved with placeholders and SpEL | ||
| Collection<String> channelNames = channelCandidatesCollector.getChannelNames(); | ||
| if (channelNames != null){ | ||
| for (String channelName : channelNames) { | ||
| if (!beanFactory.containsBean(channelName)){ | ||
| if (this.logger.isDebugEnabled()){ | ||
| this.logger.debug("Auto-creating channel '" + channelName + "' as DirectChannel"); | ||
| } | ||
| RootBeanDefinition messageChannel = new RootBeanDefinition(); | ||
| messageChannel.setBeanClass(DirectChannel.class); | ||
| BeanDefinitionHolder messageChannelHolder = new BeanDefinitionHolder(messageChannel, channelName); | ||
| BeanDefinitionReaderUtils.registerBeanDefinition(messageChannelHolder, (BeanDefinitionRegistry) this.beanFactory); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| /* | ||
| * Collects candidate channel names to be auto-created by ChannelInitializer | ||
| */ | ||
| static class AutoCreateCandidatesCollector { | ||
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| private final Collection<String> channelNames; | ||
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| public AutoCreateCandidatesCollector(Collection<String> channelNames){ | ||
| this.channelNames = channelNames; | ||
| } | ||
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| public Collection<String> getChannelNames() { | ||
| return channelNames; | ||
| } | ||
| } | ||
| } |
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