Android 简单服务定位器模式实现

repositories { 
  Maven { url "https://gitee.com/ezy/repo/raw/android_public/"}
} 
dependencies {
  implementation "me.reezy.jetpack:servicelocator:0.4.0" 
}

// 获取实例
inline fun <reified T> resolve(name: String = T::class.java.name): T?
// 注册为单例
inline fun <reified T> singleton(name: String = T::class.java.name, crossinline block: () -> T)
// 注册为工厂
inline fun <reified T> factory(name: String = T::class.java.name, crossinline block: () -> T)

class SomeService {
  fun doSomething() {
  }
}

// 注册 
singleton {
  SomeService()
}

// 获取
val service = resolve<SomeService>() 

class NamedService(val name: String) {
  fun doSomething() {
  }
}

// 注册 
singleton("a") {
  NamedService("aaa")
}
singleton("b") {
  NamedService("bbb")
}

// 获取 
val serviceA = resolve<NamedService>("a")
val serviceB = resolve<NamedService>("b")

class SomeService {
  fun doSomething() {
  }
}

// 注册 
factory {
  SomeService()
}

// 获取，每次resolve都会产生新实例
val service1 = resolve<SomeService>() 
val service2 = resolve<SomeService>() 

class NamedService(val name: String) {
  fun doSomething() {
  }
}

// 注册 
factory("a") {
  NamedService("aaa")
}
factory("b") {
  NamedService("bbb")
}

// 获取
// A1 与 A2 是使用同一工厂产生的不同实例
// A1 与 B1 是使用不同工厂产生的不同实例
val serviceA1 = resolve<NamedService>("a")
val serviceA2 = resolve<NamedService>("a")
val serviceB1 = resolve<NamedService>("b")
val serviceB2 = resolve<NamedService>("b")