是否从Play框架中删除了异步作业？什么是更好的选择？ [英] Was asynchronous jobs removed from the Play framework? What is a better alternative?

问题描述

我想使用 Job 所以我可以在应用程序启动时启动它们。现在它似乎已完全从Play中移除了？

I wanted to use Job so I can kick them off on the start of application. Now it seems like it has been removed from Play completely?

我看到一些人们创建全球类的示例，但不完全确定是否/如何使用它来替换作业。

I saw some samples where people create a Global class, but not entirely sure if/how I should use that to replace Job.

有任何建议吗？

编辑：如果你要投票，请说明理由。也许我在问题中遗漏了一些东西，也许这不属于这里。至少...

If you gonna downvote, give a reason. Maybe I'm missing something in the question, maybe this doesn't belong here. At least something...

推荐答案

在Play 2.0中删除了Job类。

The Job class was removed in Play 2.0.

你有一些选择虽然取决于你的Play版本，如果你需要不同步：

You have some alternatives though depending on your Play version and if you need asynchrony or not:

对于自Play 2.0以来的所有版本，您可以使用Akka Actors安排一次异步任务/演员，并通过Play Global 类在启动时执行它。

For all version since Play 2.0 you can use Akka Actors to schedule an asynchronous task/actor once and execute it on startup via Play Global class.

public class Global extends GlobalSettings {

    @Override
    public void onStart(Application app) {
           Akka.system().scheduler().scheduleOnce(
               Duration.create(10, TimeUnit.MILLISECONDS),
               new Runnable() {
                    public void run() {
                        // Do startup stuff here
                        initializationTask();
                    }
               },
               Akka.system().dispatcher()
           );
      }  
 }

参见 https://www.playframework.com/documentation/2.3.x/JavaAkka 了解详情。

从Play 2.4开始，你可以急切地将单身人士与Guice绑定

Starting with Play 2.4 you can eagerly bind singletons with Guice

import com.google.inject.AbstractModule;
import com.google.inject.name.Names;

public class StartupConfigurationModule extends AbstractModule {
    protected void configure() {

        bind(StartupConfiguration.class)
            .to(StartupConfigurationImpl.class)
            .asEagerSingleton();
    }
}

StartupConfigurationImpl 将在默认构造函数中完成它。

The StartupConfigurationImpl would have it's work done in the default constructor.

@Singleton
public class StartupConfigurationImpl implements StartupConfiguration {
    @Inject
    private Logger log;

    public StartupConfigurationImpl() {
        init();
    }

    public void init(){
        log.info("init");
    }
}

参见 https://www.playframework.com/documentation/2.4.x/JavaDependencyInjection#Eager-bindings

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