吉斯MapBinder

我使用吉斯在Java中+科特林项目注入算法实现的地图到一个特定的bean，但我不断收到吉斯MapBinder

1) No implementation for java.util.Map<java.lang.String, ? extends com.scherule.scheduling.algorithms.SchedulingAlgorithm> annotated with @com.google.inject.name.Named(value=scheduling.algorithms) was bound. 
    while locating java.util.Map<java.lang.String, ? extends com.scherule.scheduling.algorithms.SchedulingAlgorithm> annotated with @com.google.inject.name.Named(value=scheduling.algorithms) 
    for the 2nd parameter of com.scherule.scheduling.SchedulingJobConsumer.<init>(SchedulingJobConsumer.kt:17) 
    while locating com.scherule.scheduling.SchedulingJobConsumer

模块的定义是这样定义的：

class AlgorithmsModule : AbstractModule() { 

    override fun configure() { 
     MapBinder.newMapBinder(binder(), 
       String::class.java, 
       SchedulingAlgorithm::class.java, 
       Names.named("scheduling.algorithms") 
     ).addBinding("interval-projection").toInstance(IntervalProjectionAlgorithm()) 
    } 

}

和呼叫者的代码是：

@Singleton 
class SchedulingJobConsumer 
@Inject constructor(
     @Named("scheduling.channel") channel: Channel, 
     @Named("scheduling.algorithms") val schedulers: Map<String, SchedulingAlgorithm> 
) : DefaultConsumer(channel) ...

但是当我做

injector.getInstance(Key.get(new TypeLiteral<Map<String, SchedulingAlgorithm>>() {}, named("scheduling.algorithms")))

它在那里。怎么了？

来源

2017-07-24 kboom

尝试在'val schedulers'的声明中添加'@ JvmSuppressWildcards'注释 – yole

将它添加到构造函数声明中不会改变任何内容。在字段上执行此操作会将错误消息修改为java.util.Map的No实现（...）所以它似乎甚至找不到它。 – kboom

错误消息似乎说它找不到SchedulingAlgorithm的实现。那是如何定义的？ – Les

问题在于Kotlin Generics！= Java Generics。

This Kotlin code。

@Named("scheduling.algorithms") val schedulers: Map<String, SchedulingAlgorithm>

获取在注射吉斯寻找Map<String, ? extends SchedulingAlgorithm>为它不具有约束力的MapBinder创建的绑定为Map<String, SchedulingAlgorithm>编译为

Map<String, ? extends SchedulingAlgorithm> and not Map<String, SchedulingAlgorithm>

。

来源

2017-09-12 13:11:06

吉斯MapBinder

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