Question

我目前正在使用此处找到的课程：

http://www.qualitybrain.com/?p=84

一切都运行良好，但我需要代码等待命令完成然后返回一个真/假类型的响应，这样我就可以继续结果了。

我将它与OpenOffice结合使用来转换某些文档，因此在使用生成的文件之前等待文档转换完成是至关重要的。

感谢您的帮助，非常感谢：）

Answer 1

代码应该已经等待命令完成，因为receiveWithin是阻塞方法。您可以自行测试，只需运行示例main函数sleep 10和println之前和之后。
从run函数中获取boolean结果应该非常简单，您只需要对运行函数进行一些小修改。

新run功能：

def run(command:String) : Boolean = {
    println("gonna runa a command: " + Thread.currentThread)
    val args = command.split(" ")
    val processBuilder = new ProcessBuilder(args: _* )
    processBuilder.redirectErrorStream(true)
    val proc = processBuilder.start()

    //Send the proc to the actor, to extract the console output.
    reader ! proc

    //Receive the console output from the actor.
    //+========== Begin Modified Section ==============+
    //Here, we'll store the result instead of printing it, storing a None
    //if there was a timeout

    var commandResult : Option[String] = None
    receiveWithin(WAIT_TIME) {
        case TIMEOUT => commandResult = None
        case result:String => commandResult = Some(result)
    }

    //Here we interpret the result to return our boolean value
    commandResult match {
        case None => false
        case Some(s) => //... You'll have to transform the result to a true/false
            //however is most applicable to your use case
    }
}

Scala Lift - 运行系统命令并等待完成

1 个答案: