Spring Mongo Populator 一一

Question

我在 Kotlin 上使用 MongoDB 和 Spring，我希望我的应用程序在启动时填充 MongoDB 集合。 (并在每次启动时清洁它)

我的问题是，如果我正在填充的某些数据有问题，我该如何一一填充数据以便容错？

我的代码:

@Configuration
class IndicatorPopulator {
    @Value("classpath:indicatorData.json")
    private lateinit var data: Resource

    @Autowired
    private lateinit var indicatorRepository: IndicatorRepository

    @Bean
    @Autowired
    fun repositoryPopulator(objectMapper: ObjectMapper): Jackson2RepositoryPopulatorFactoryBean {
        val factory = Jackson2RepositoryPopulatorFactoryBean()
        indicatorRepository.deleteAll()
        factory.setMapper(objectMapper)
        factory.setResources(arrayOf(data))
        return factory
    }

我正在寻找的是这样的:

@Bean
@Autowired
fun repositoryPopulator(objectMapper: ObjectMapper): Jackson2RepositoryPopulatorFactoryBean {
    val factory = Jackson2RepositoryPopulatorFactoryBean()
    indicatorRepository.deleteAll()
    factory.setMapper(objectMapper)
    val arrayOfResources: Array<Resource> = arrayOf(data)
    for (resource in arrayOfResources){
            try{
             factory.setResources(resource)
            } catch(e: Exception){
                 logger.log(e.message)
            }

    }
    return factory
}

关于如何做这样的事情的任何想法都会有所帮助......
提前致谢。

Answer 1

没有对您的询问的内置支持，但您可以通过调整几个类轻松提供。

添加自定义 Jackson 2 阅读器

public class CustomJackson2ResourceReader implements ResourceReader {

    private static final Logger logger = LoggerFactory.getLogger(CustomJackson2ResourceReader.class);

    private final Jackson2ResourceReader resourceReader = new Jackson2ResourceReader();

    @Override
    public Object readFrom(Resource resource, ClassLoader classLoader) throws Exception {
        Object result;
        try {
            result = resourceReader.readFrom(resource, classLoader);
        } catch(Exception e) {
            logger.warn("Can't read from resource", e);
            return Collections.EMPTY_LIST;
        }
        return result;
    }
}

添加自定义 Jackson 2 Populator

public class CustomJackson2RepositoryPopulatorFactoryBean extends Jackson2RepositoryPopulatorFactoryBean {
    @Override
    protected ResourceReader getResourceReader() {
        return new CustomJackson2ResourceReader();
    }
}

配置

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Bean
    public AbstractRepositoryPopulatorFactoryBean repositoryPopulator(ObjectMapper objectMapper, KeyValueRepository keyValueRepository) {
        Jackson2RepositoryPopulatorFactoryBean factory = new CustomJackson2RepositoryPopulatorFactoryBean();
        keyValueRepository.deleteAll();
        factory.setMapper(objectMapper);
        factory.setResources(new Resource[]{new ClassPathResource("badclassname.json"), new ClassPathResource("good.json"), new ClassPathResource("malformatted.json")});
        return factory;
    }

}

我上传了一个工作示例 here