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POCreating a collection of beans in Spring using @Configuration
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  1. POCreating a collection of beans in Spring using @Configuration
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    copied!<p>How can I create a collection of beans that will be properly managed by Spring using a class with a @Configuration annotation.</p> <p>I would like to do something like this:</p> <pre><code>@Configuration public Config { @Autowired private SomeConfiguration config; @Bean public List&lt;MyBean&gt; myBeans() { List&lt;MyBean&gt; beans = new ArrayList&lt;MyBean&gt;(); for (Device device : config.getDevices()) { beans.add(new MyBean(device)); } return beans; } } </code></pre> <p>But the MyBean instances aren't post processed. So their @Autowired methods are not called, the beans are not registered as mbeans and etc. The list is however accessible so that I can autowire a List of MyBean objects.</p> <p>I cannot use something like:</p> <pre><code>@Configuration public Config { @Autowired private SomeConfiguration config; @Bean public MyBean myBean1() { ... } @Bean public MyBean myBean2() { ... } } </code></pre> <p>Since the number of MyBean instances are not known before runtime. The reason I want to do this is because we are controlling a physical machine that have a variable amount of components. And I want to have one bean per component.</p> <p>I'm currently achieving our goal by using a BeanFactoryPostProcessor like this:</p> <pre><code>@Component public class MyBeansFactoryPostProcessor implements BeanFactoryPostProcessor { @Autowired private SomeConfiguration config; @Override public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeanException { for (Device device : config.getDevices()) { createAndRegister(BeanDefinitionRegistry) beanFactory, device); } } private void createAndRegister(BeanDefinitionRegistry registry, Device device) { register.registerBeanDefinition("device" + device.getId(), BeanDefinitionBuilder.genericBeanDefinition(MyBean.class).addConstructorArgValue(device).getBeanDefinition()); } } </code></pre> <p>But this just feels like a really ugly hack.</p>
 

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