在运行时在字符串中编译Scala源

时间:2015-09-03 06:24:50

标签: scala reflection runtime

我的程序中有一个抽象类

abstract class Deployment {

  /**
   * Defines a logger to be used by the deployment script
   */
  protected val logger = LoggerFactory.getLogger(this.getClass)

  /**
   * Defines the entry point to the deployment
   *
   * @throws java.lang.Exception Thrown on the event of an unrecoverable error
   */
  def run(): Unit
}

当我尝试加载类时,它们是源代码形式,所以我在加载时编译它们

val scriptFile = new File("testing.scala")

val mirror = universe.runtimeMirror(getClass.getClassLoader)
val toolBox = mirror.mkToolBox()

val parsedScript = toolBox.parse(Source.fromURI(scriptFile.toURI).mkString)
val compiledScript = toolBox.eval(parsedScript)

val deployment = compiledScript.asInstanceOf[Deployment]
deployment.run()

这是测试文件

import au.com.cleanstream.kumo.deploy.Deployment

class testing extends Deployment {

  override def run(): Unit = {
    logger.info("TEST")
  }

}

但是当我运行代码时,我得到java.lang.AssertionError: assertion failed,我也已经累了toolBox.compile(parsedScript),但却得到了相同的东西。

非常感谢任何帮助!

1 个答案:

答案 0 :(得分:2)

toolBox.eval(parsedScript)返回() => Any 在您的情况下,测试文件返回UnitcompiledScript的类型为BoxedUnit

如果更改测试文件以返回某个值,则可以访问它。 我修改了测试文件如下:

object Testing extends Deployment {
  override def run(): Unit = {
    logger.info("TEST")
  }
}
Testing //This is the SOLUTION