spring-batch BeanFactoryStepLocator 源码
spring-batch BeanFactoryStepLocator 代码
文件路径：/spring-batch-integration/src/main/java/org/springframework/batch/integration/partition/BeanFactoryStepLocator.java
package org.springframework.batch.integration.partition;
import java.util.Arrays;
import java.util.Collection;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.step.StepLocator;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.util.Assert;
/**
* A {@link StepLocator} implementation that just looks in its enclosing bean factory for
* components of type {@link Step}.
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
*
*/
public class BeanFactoryStepLocator implements StepLocator, BeanFactoryAware {
private BeanFactory beanFactory;
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
}
/**
* Look up a bean with the provided name of type {@link Step}.
* @see StepLocator#getStep(String)
*/
public Step getStep(String stepName) {
return beanFactory.getBean(stepName, Step.class);
}
/**
* Look in the bean factory for all beans of type {@link Step}.
* @throws IllegalStateException if the {@link BeanFactory} is not listable
* @see StepLocator#getStepNames()
*/
public Collection<String> getStepNames() {
Assert.state(beanFactory instanceof ListableBeanFactory, "BeanFactory is not listable.");
return Arrays.asList(((ListableBeanFactory) beanFactory).getBeanNamesForType(Step.class));
}
}
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