如何在 sbt 中使用 fullRunTask 分叉进程? [英] How to fork process with fullRunTask in sbt?

问题描述

我正在编写一个从 sbt 启动服务器的 sbt 插件.

I'm writing a sbt plugin that start a server from sbt.

lazy val kstart = taskKey[Unit]("Start scala kata")
lazy val Backend = config("backend")
Seq(
  fullRunTask(kstart, Backend, "com.scalakata.backend.Boot", "..."),
  fork in kstart := true,
  connectInput in kstart := false
)

问题是服务器启动后没有sbt提示

The problem is that after the server is started, I dont have a sbt prompt.

> kstart
[info] Running com.scalakata.backend.Boot _
// no prompt here :(

看起来进程没有fork什么的.

It look like the process did not fork or something.

推荐答案

您在单独的 JVM 中运行您的服务器，您遇到的问题是 sbt 将等待进程退出，然后让您输入任何其他内容.

You're running your server in a separate JVM, the problem you're having is that sbt will wait for the process to exit before letting you type anything else.

相关代码见GitHub.

// fork with Java because Scala introduces an extra class loader (#702)
val process = Fork.java.fork(configLogged, scalaOptions)
def cancel() = {
  log.warn("Run canceled.")
  process.destroy()
  1
}
val exitCode = try process.exitValue() catch { case e: InterruptedException => cancel() }

调用 process.exitValue() 将阻塞，直到进程存在.

The call process.exitValue() will block until the process exists.

如果你想让它在后台运行，我认为你必须自己控制这个过程.

I think you'll have to control the process by yourself if you want it to run in the background.

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