Question

我正在尝试创建一个名为TaskBeanFactory的BeanFactory，我可以将其自动装入另一个在线程上运行的原型类。我想要一个由Factory返回的bean的不同实例，它基于我要传递给它的taskName但是当我启动应用程序时，我得到一个空指针异常，因为taskName为null。我查看了this article，但我对如何配置Factory然后传入taskName感到困惑。

工厂：

 import org.springframework.beans.factory.config.AbstractFactoryBean;
    import org.springframework.stereotype.Component;

    @Data
    @Component
    @NoArgsConstructor
    public class TaskBeanFactory extends AbstractFactoryBean<GenericTask>{

        private TaskNameEnum taskName;

        public TaskBeanFactory(TaskNameEnum taskName) {     
            setSingleton(false);
        }

        @Override
        public Class<?> getObjectType() {
            return GenericTask.class;
        }

        @Override
        protected GenericTask createInstance() throws Exception {
            switch (taskName) {
                case FILE_OPERATION:
                    return new FileTask();
                case DATA_OPERATION:            
                    return new DataTask();          
                default:
                    return new GenericTask();
            }
        }

    }

工厂使用的类：

@Data
    public class GenericTask {

        private String idTask;

        public void executeTask(Work work) {};
    }



 @Component
    @Scope(value="prototype")
    public class FileTask extends GenericTask {

        @Override
        public void executeTask(Work work) {        
            //some processing
        }
    }

@Component
@Scope(value="prototype")
public class DataTask extends GenericTask {

    @Override
    public void executeTask(Work work) {        
        //some processing
    }
}

和调用Factory的线程：

@Slf4j
@Data
@Scope("prototype")
@Component
public class WorkerThread implements Runnable {

    @Autowired
    private TaskBeanFactory taskBeanFactory;

    @Autowired
    private DataService dataService;

    @Override
    public void run() {

            //iterate a Map of taskIds from the dataService

            taskBeanFactory.setTaskName(TaskNameEnum.valueOf(taskEntry.getKey()));
            GenericTask genericTask = taskBeanFactory.getObject();

            //expecting genericTask to be of Type FileTask if called with one Key 
            //or of Type DataTask if called with another
        }
    }
}

Spring Bean Factory配置传递输入参数

0 个答案: