如何检查MongoDB是否启动并运行使用reactivemongo

Question

我想写一个帮助函数，将允许我的仪表板检查是否MongoDB运行不。根据结果​​，它可能会在可视化仪表板上警告管理员。我通读了反应式mongo文档here，到目前为止我有以下功能，但不幸的是它不工作。

import reactivemongo.api.MongoDriver 

def isMongoUp(host: String): Boolean = { 

    var connected = false 
    val driver = new MongoDriver() 
    val connection = driver.connection(List(host)) 
    val db = connection("myDB") 
    db.map { 
    case Failure(e) => connected = false 
    case Success(result) => connected = true 
    } 

} 

更新1：

def isMongoUp(host: String): Boolean = { 
    var connected = false 
    val driver = new MongoDriver() 
    val connection = driver.connection(List(host)) 
    val db = connection.database("myDB") 
    db.map { 
    case sth:DefaultDB => connected = true 
    case _ => connected = false 
    } 
    connected 

} 

val result = isMongoUp("localhost") 
result 

Answer 1

我把它做了这样：

def isMongoUp(host: String): Boolean = { 

    val driver = new MongoDriver() 
    val connection = driver.connection(List(host)) 
    val db = connection.database("myDB") 
    val connectedFuture: Future[Boolean] = db.map { list => 
     list match { 
     case sth: DefaultDB => true 
     case _ => false 
     } 
    }.recover { case error: Throwable => false} 
    val timeout = scala.concurrent.duration.Duration(5, "seconds") 

    val result = Await.result(connectedFuture, timeout) 
    result 

    }