scala伴生对象的初始化问题求教一段代码

[飞火流云]

这里我想把mockLoadFile在mP对象初始化的时候就执行，但是不知道该怎么写，求指点如何修改伴生对像的构造函数呢?
似乎apply不大管用?

package test
 
trait PartitionStrategy extends Serializable {
  /** Returns the partition number for a given edge. */
  def getPartition(key: Int): Int
}
 
object PartitionStrategy {
    def fromString(s: String): PartitionStrategy = s match {
    case "MetisPartition" => MetisPartition
    case _ => throw new IllegalArgumentException("Invalid PartitionStrategy: " + s)
  }
     
     case object MetisPartition extends PartitionStrategy {
      val metisMap =new scala.collection.mutable.HashMap[Int,Int] 
      def mockLoadFile() {
          try {
       var id = 1 ;
       while(id < 10000)
       {
           var partition = 5 ;
           metisMap.put(id, partition)
           id = id +1 
       }
       println("size: " + metisMap.size)
    } catch  {
       case ex: Exception => { // Handle missing file 
            ex.printStackTrace()
       }  
    }
  }
      
    override def getPartition(src: Int): Int = {
      var s = metisMap.get(src)
      if(!s.isEmpty)
      return s.getOrElse(0)
      else
        throw new IllegalArgumentException("Metis can't find partition!")
    }
  }
}
 
 
package test
 
object TestPartition {
 
  def main(args: Array[String]): Unit = {
         try {
            var mP = PartitionStrategy.fromString("MetisPartition")   
            println(mP.getPartition(110))
     } catch {
         case ex: Exception => {
           ex.printStackTrace() 
         }
     } 
  }
}