Kotlin协程是否总是在同一线程上运行？如果没有，那么我们如何让它与Guice请求作用域语义一起工作呢？

import com.google.inject.servlet.RequestScoped
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import javax.inject.Inject

@RequestScoped
class CoroutineRequestScope @Inject constructor(private val dispatcher: CoroutineDispatcher) {
    fun <T> runInScope(block: suspend CoroutineScope.() -> T): T {
        val scope = CoroutineScope(dispatcher)
        return scope.launch { block.invoke(this) }.join()
    }
}

// 在代码的其他地方使用CoroutineRequestScope
class MyService @Inject constructor(private val requestScope: CoroutineRequestScope) {
    fun doSomething() {
        requestScope.runInScope {
            // 在这里编写需要在Guice请求作用域内运行的协程代码
        }
    }
}