10

试图了解如何设置 SBT子项目。为我的所有子项目设置默认依赖项的正确方法是什么？

我试过这个，但我的子项目没有获取任何依赖项（他们下载得很好）。

import sbt._

class MyProjects(info: ProjectInfo) extends DefaultProject(info)
{
  val projA = project("projA", "ProjectA")
  val projB = project("projB", "ProjectB")

  val akkaRepo = "Akka maven2 repo" at "http://www.scalablesolutions.se/akka/repository/"
  val multiverseRepo = "Multiverse maven2 repo" at "http://multiverse.googlecode.com/svn/maven-repository/releases/"
  val guiceyFruitRepo = "GuiceyFruit Maven2 repo" at "http://guiceyfruit.googlecode.com/svn/repo/releases/"
  val jBossRepo = "JBoss maven2 repo" at "https://repository.jboss.org/nexus/content/groups/public/"

  val junit = "junit" % "junit" % "4.5" % "test"
  val scalatest = "org.scalatest" % "scalatest" % "1.2" % "test"
  val akka = "se.scalablesolutions.akka" % "akka-core_2.8.0" % "0.10"
}

然后，基于此，我尝试了以下方法。它奏效了，但这不是我所期望的。为所有子项目设置默认依赖项不是更简单吗？

import sbt._  

class MyProjects(info: ProjectInfo) extends DefaultProject(info)
{
  val projA = project("projA", "ProjectA", new Proj(_))
  val projB = project("projB", "ProjectB", new Proj(_))

  val akkaRepo = "Akka maven2 repo" at "http://www.scalablesolutions.se/akka/repository/"
  val multiversRepo = "Multiverse maven2 repo" at "http://multiverse.googlecode.com/svn/maven-repository/releases/"
  val guiceyFruitRepo = "GuiceyFruit Maven2 repo" at "http://guiceyfruit.googlecode.com/svn/repo/releases/"
  val jBossRepo = "JBoss maven2 repo" at "https://repository.jboss.org/nexus/content/groups/public/"

  class Proj(info:ProjectInfo) extends DefaultProject(info){
    val junit = "junit" % "junit" % "4.5" % "test"
    val scalatest = "org.scalatest" % "scalatest" % "1.2" % "test"
    val akka = "se.scalablesolutions.akka" % "akka-core_2.8.0" % "0.10"
  }
}

编辑：应该指出使用 Akka 有更好的方法，但这只是说明我的观点。

4

3 回答 3

15

使用继承和混合：

import sbt._

class ModularProject(info: ProjectInfo) extends DefaultProject(info){

    lazy val childProject = project("projA", "ProjectA", 
        new DefaultProject(_)   
            with Repositories 
            with GlobalDependencies
            with AkkaDependencies)

    trait Repositories{
        lazy val akkaRepo = "Akka maven2 repo" at 
        "http://www.scalablesolutions.se/akka/repository/"
        lazy val multiversRepo = "Multiverse maven2 repo" at 
        "http://multiverse.googlecode.com/svn/maven-repository/releases/"
        lazy val guiceyFruitRepo = "GuiceyFruit Maven2 repo" at 
        "http://guiceyfruit.googlecode.com/svn/repo/releases/"
        lazy val jBossRepo = "JBoss maven2 repo" at 
        "https://repository.jboss.org/nexus/content/groups/public/"
    }

    trait GlobalDependencies{
        lazy val junit = "junit" % "junit" % "4.5" % "test"
        lazy val scalatest = "org.scalatest" % "scalatest" % "1.2" % "test"
    }

    trait AkkaDependencies{
        lazy val akka = "se.scalablesolutions.akka" % "akka-core_2.8.0" % "0.10"
    }       

}
于 2010-12-02T12:49:58.633 回答
1

正常的解决方案是将每个子项目的依赖项放在一个类中，就像您对 Proj 类所做的那样。通常每个子项目需要一个类，因为它们通常具有唯一的依赖关系。

如果你是懒惰的，你可以用内联的依赖声明这个类：

object Dependencies {
    ....
    lazy val jodaTime = "joda-time" % "joda-time" % ...
    lazy val scalaTime = "org.scala-tools" % "time" % ...
    lazy val redis = "com.redis" % "redisclient" % ...
}

val xBase = project("x-base", "x-base", new DefaultProject(_) {
    val jodaTime = Dependencies.jodaTime
    val scalaTime = Dependencies.scalaTime
  })

val xY = project("x-y", "x-y", new DefaultProject(_) { val redis = Dependencies.redis }, xBase)

在上面的示例中（对于产品 x），xY模块依赖于xBase模块。

Dependencies 对象使重用模块中的依赖关系变得容易。

于 2010-12-02T13:07:20.473 回答
1

自那以后发生了很多变化，并且使用sbt 0.13.x 现在可以在根项目中“为我的所有子项目设置默认依赖项”，即其他子项目（然后他们将设置分辨率委托给），如下所示：project/RootBuild.scalaaggregate

import sbt._
import Keys._

object RootBuild extends Build {
  override lazy val settings = super.settings ++
    Seq(resolvers += "Akka maven2 repo" at "http://www.scalablesolutions.se/akka/repository/")
}

有了这个resolvers设置，子项目也将设置它。

[root]> resolvers
[info] a/*:resolvers
[info]  List(Akka maven2 repo: http://www.scalablesolutions.se/akka/repository/)
[info] b/*:resolvers
[info]  List(Akka maven2 repo: http://www.scalablesolutions.se/akka/repository/)
[info] root/*:resolvers
[info]  List(Akka maven2 repo: http://www.scalablesolutions.se/akka/repository/)

build.sbt根项目如下：

lazy val root = project in file(".") aggregate (a, b)

lazy val a = project dependsOn b

lazy val b = project

查阅 sbt 的官方文档关于.scala Build Definition。

然而，还有另一种（更好的？）方法可以使用ThisBuild范围定义通用配置。

lazy val root = project in file(".") aggregate (a, b)

lazy val a = project dependsOn b

lazy val b = project

resolvers in ThisBuild += "JBoss maven2 repo" at "https://repository.jboss.org/nexus/content/groups/public/"

使用上面的RootBuild.scala构建定义以及build.sbt我曾经in ThisBuild为整个构建设置范围的地方，构建配置最终resolvers在多项目设置中默认有两个。

[root]> resolvers
[info] a/*:resolvers
[info]  List(Akka maven2 repo: http://www.scalablesolutions.se/akka/repository/, JBoss maven2 repo: https://repository.jboss.org/nexus/content/groups/public/)
[info] b/*:resolvers
[info]  List(Akka maven2 repo: http://www.scalablesolutions.se/akka/repository/, JBoss maven2 repo: https://repository.jboss.org/nexus/content/groups/public/)
[info] root/*:resolvers
[info]  List(Akka maven2 repo: http://www.scalablesolutions.se/akka/repository/, JBoss maven2 repo: https://repository.jboss.org/nexus/content/groups/public/)
于 2014-01-06T14:18:15.533 回答