英文:
What is the Spring DI equivalent of Dagger2 Subcomponents
问题
Dagger2具有子组件（Subcomponents）功能，用于在比主应用程序更短的生命周期内进行依赖注入（DI）。例如，如果您有一个作业服务（job service），那么该服务将具有一个包含每个作业的子组件的组件（Component）。
在Spring的依赖注入（DI）框架中，相对应的功能是什么？
英文:
Dagger2 has Subcomponents https://medium.com/tompee/dagger-2-scopes-and-subcomponents-d54d58511781 for using DI with shorter lifecycles than the main application, for example if you have a job service then the service will have a Component with Subcomponents for each job.
What is the equivalent for Spring's DI framework?
答案1
得分: 1
以下是翻译好的内容：
我所能看到的唯一可能性就是使用上下文层次结构，并手动处理生命周期较短的上下文。
// Dagger的@Subcomponent.Factory是否起作用
public class JobExecutor {
private final ApplicationContext mainApplicationContext;
@Inject
public JobExecutor(ApplicationContext mainApplicationContext) {
this.mainApplicationContext = mainApplicationContext;
}
public Result execute(Job job) {
AnnotationConfigApplicationContext jobContext = null;
try {
jobContext = new AnnotationConfigApplicationContext();
jobContext.setParent(mainApplicationContext); // 提供对共享bean的访问
jobContext.register(SpringJobContext.class);
jobContext.getBeanFactory().registerSingleton("job", job); // Dagger的@BindsInstance是否起作用
jobContext.refresh();
// 您可以手动访问并执行jobContext中的一个bean，或使用@PostConstruct
return jobContext.getBean(JobExecutorFromJobContext.class)
.execute();
} finally {
if (jobContext != null) {
jobContext.destroy();
}
}
}
static class JobExecutorFromJobContext {
private final Database database; // 来自父上下文
private final Job job;
@Inject
JobExecutorFromJobContext(Database database, Job job) {
this.database = database;
this.job = job;
}
public void execute() {
// ...
}
}
}
英文:
The only possibility I can see is to use context hierarchy and to handle context with shorter lifecycle manually.
// Does Dagger's @Subcomponent.Factory work
public class JobExecutor {
private final ApplicationContext mainApplicationContext;
@Inject
public JobExecutor(ApplicationContext mainApplicationContext) {
this.mainApplicationContext = mainApplicationContext;
}
public Result execute(Job job) {
AnnotationConfigApplicationContext jobContext = null;
try {
jobContext = new AnnotationConfigApplicationContext();
jobContext.setParent(mainApplicationContext); // Provides access to common beans
jobContext.register(SpringJobContext.class);
jobContext.getBeanFactory().registerSingleton("job", job); // Does Dagger's @BindsInstance work
jobContext.refresh();
// You can access and execute one of the beans from jobContext manually or use @PostConstruct
return jobContext.getBean(JobExecutorFromJobContext.class)
.execute();
} finally {
if (jobContext != null) {
jobContext.destroy();
}
}
}
static class JobExecutorFromJobContext {
private final Database database; // From parent's context
private final Job job;
@Inject
JobExecutorFromJobContext(Database database, Job job) {
this.database = database;
this.job = job;
}
public void execute() {
// ...
}
}
}
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