如何自动装配Spring TaskExecutor创建的线程？

Question

根据Spring的文档,使用TaskExecutor的方法如下:

import org.springframework.core.task.TaskExecutor;

public class TaskExecutorExample {

  private class MessagePrinterTask implements Runnable {

    private String message;

    public MessagePrinterTask(String message) {
      this.message = message;
    }

    public void run() {
      System.out.println(message);
    }

  }

  private TaskExecutor taskExecutor;

  public TaskExecutorExample(TaskExecutor taskExecutor) {
    this.taskExecutor = taskExecutor;
  }

  public void printMessages() {
    for(int i = 0; i < 25; i++) {
      taskExecutor.execute(new MessagePrinterTask("Message" + i));
    }
  }
}

但是,如果MessagePrinterTask具有自动连接的依赖关系,它们将不会被Spring配置,因为我们在Spring的上下文之外实例化我们的bean(至少我理解它是这样),即使Spring将提供实际的线程创建.如果MessagePrinterTask具有自动连接的依赖关系,我们如何让Spring识别它们？我尝试了以下修改示例无效(是的,正确启用了自动装配):

import org.springframework.core.task.TaskExecutor;

public class TaskExecutorExample {

  @Component
  private class MessagePrinterTask implements Runnable {

    @Autowired
    private autoWiredDependency;

    public void run() {
      autoWiredDependency.doNotThrowNullPointerExceptionPlease();
    }

  }

  private TaskExecutor taskExecutor;

  public TaskExecutorExample(TaskExecutor taskExecutor) {
    this.taskExecutor = taskExecutor;
  }

  public void printMessages() {
    for(int i = 0; i < 25; i++) {
      taskExecutor.execute(new MessagePrinterTask());
    }
  }
}

Answer 1

我认为有两种方法可以解决这个问题:

一个.提供任务的依赖关系 - 这样:

class MessagePrinterTask implements Runnable {
    public MessagePrinterTask(ADependency aDependency){
        this.aDependency = aDependency;
    }


    private ADependency aDependency;

    public void run() {
        aDependency.doNotThrowNullPointerExceptionPlease();
    }
}

在你的TaskExectorExample中,它可以是单例:

import org.springframework.core.task.TaskExecutor;

public class TaskExecutorExample {

  @Autowired  private ADependency aDependency;

  @Autowired
  public TaskExecutorExample(TaskExecutor taskExecutor) {
    this.taskExecutor = taskExecutor;
  }

  public void printMessages() {
    for(int i = 0; i < 25; i++) {
      taskExecutor.execute(new MessagePrinterTask(this.aDependency));
    }
  }
}

湾 在MesasgePrinterTask上使用@Configurable注释,这将依赖注入MessagePrinterTask,即使它是在Spring容器之外实例化的 - 尽管使用@Configurable(需要AspectJ)仍有一些问题:

@Configurable
class MessagePrinterTask implements Runnable {