spring-batch JobRegistryBeanPostProcessor 源码
spring-batch JobRegistryBeanPostProcessor 代码
文件路径:/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/support/JobRegistryBeanPostProcessor.java
/*
* Copyright 2006-2022 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.batch.core.configuration.support;
import java.util.Collection;
import java.util.HashSet;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.configuration.DuplicateJobException;
import org.springframework.batch.core.configuration.JobLocator;
import org.springframework.batch.core.configuration.JobRegistry;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.util.Assert;
/**
* A {@link BeanPostProcessor} that registers {@link Job} beans with a
* {@link JobRegistry}. Include a bean of this type along with your job configuration and
* use the same {@link JobRegistry} as a {@link JobLocator} when you need to locate a
* {@link Job} to launch.
*
* @author Dave Syer
*
*/
public class JobRegistryBeanPostProcessor
implements BeanPostProcessor, BeanFactoryAware, InitializingBean, DisposableBean {
private static Log logger = LogFactory.getLog(JobRegistryBeanPostProcessor.class);
// It doesn't make sense for this to have a default value...
private JobRegistry jobRegistry = null;
private Collection<String> jobNames = new HashSet<>();
private String groupName = null;
private DefaultListableBeanFactory beanFactory;
/**
* The group name for jobs registered by this component. Optional (defaults to null,
* which means that jobs are registered with their bean names). Useful where there is
* a hierarchy of application contexts all contributing to the same
* {@link JobRegistry}: child contexts can then define an instance with a unique group
* name to avoid clashes between job names.
* @param groupName the groupName to set
*/
public void setGroupName(String groupName) {
this.groupName = groupName;
}
/**
* Injection setter for {@link JobRegistry}.
* @param jobRegistry the jobConfigurationRegistry to set
*/
public void setJobRegistry(JobRegistry jobRegistry) {
this.jobRegistry = jobRegistry;
}
/*
* (non-Javadoc)
*
* @see org.springframework.beans.factory.BeanFactoryAware#setBeanFactory(org
* .springframework.beans.factory.BeanFactory)
*/
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
if (beanFactory instanceof DefaultListableBeanFactory) {
this.beanFactory = (DefaultListableBeanFactory) beanFactory;
}
}
/**
* Make sure the registry is set before use.
*
* @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
*/
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(jobRegistry, "JobRegistry must not be null");
}
/**
* Unregister all the {@link Job} instances that were registered by this post
* processor.
* @see org.springframework.beans.factory.DisposableBean#destroy()
*/
@Override
public void destroy() throws Exception {
for (String name : jobNames) {
if (logger.isDebugEnabled()) {
logger.debug("Unregistering job: " + name);
}
jobRegistry.unregister(name);
}
jobNames.clear();
}
/**
* If the bean is an instance of {@link Job}, then register it.
* @throws FatalBeanException if there is a {@link DuplicateJobException}.
*
* @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessAfterInitialization(java.lang.Object,
* java.lang.String)
*/
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof Job) {
Job job = (Job) bean;
try {
String groupName = this.groupName;
if (beanFactory != null && beanFactory.containsBean(beanName)) {
groupName = getGroupName(beanFactory.getBeanDefinition(beanName), job);
}
job = groupName == null ? job : new GroupAwareJob(groupName, job);
ReferenceJobFactory jobFactory = new ReferenceJobFactory(job);
String name = jobFactory.getJobName();
if (logger.isDebugEnabled()) {
logger.debug("Registering job: " + name);
}
jobRegistry.register(jobFactory);
jobNames.add(name);
}
catch (DuplicateJobException e) {
throw new FatalBeanException("Cannot register job configuration", e);
}
return job;
}
return bean;
}
/**
* Determine a group name for the job to be registered. The default implementation
* returns the {@link #setGroupName(String) groupName} configured. Provides an
* extension point for specialised subclasses.
* @param beanDefinition the bean definition for the job
* @param job the job
* @return a group name for the job (or null if not needed)
*/
protected String getGroupName(BeanDefinition beanDefinition, Job job) {
return groupName;
}
/**
* Do nothing.
*
* @see org.springframework.beans.factory.config.BeanPostProcessor#postProcessBeforeInitialization(java.lang.Object,
* java.lang.String)
*/
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
return bean;
}
}
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