Scala HashMap类代码示例

//设置package包名称以及导入依赖的类
package ppl.dsl.optiml.datastruct.scala

import ppl.dsl.optila.datastruct.scala._
import collection.mutable.{HashMap}

class Graph[VD:Manifest,ED:Manifest] {
  // TODO: we are storing a lot of data here. investigate reducing the footprint vs. performance.
  var _edgeToVertices = HashMap[Edge[VD,ED], (Vertex[VD,ED], Vertex[VD,ED])]()
  // var verticesToEdges = HashMap[(V, V), E]()

  // this is used only during construction (before frozen), for fast sorting
  var _adjacencies = HashMap[Vertex[VD,ED], List[(Edge[VD,ED], Vertex[VD,ED])]]()

  // this is used only after construction (after frozen), for fast access
  // Map from vertex to id
  val _vertexIds = HashMap[Vertex[VD,ED], Int]()

  var _vertices : Array[Vertex[VD,ED]] = null
  var _edges : Array[Edge[VD,ED]] = null

  var _vertexEdges : Array[DenseVector[Edge[VD,ED]]] = null
  var _neighbors : Array[DenseVector[Vertex[VD,ED]]] = null
  var _neighborsSelf : Array[DenseVector[Vertex[VD,ED]]] = null

  var _frozen = false
} 

//设置package包名称以及导入依赖的类
package ppl.dsl.deliszt.datastruct.scala

import collection.mutable.{Map, HashMap}



class LabelData[MO<:MeshObj] {
  val data: Map[String,Array[Object]] = new HashMap[String,Array[Object]]()
  val fns: Map[String,Object => Object] = new HashMap[String,Object => Object]()
} 

trait MeshObj {
  def id : Int
}

trait Vertex extends MeshObj
trait Edge extends MeshObj
trait Face extends MeshObj
trait Cell extends MeshObj
 
class Mesh {
  implicit val vertexData = new LabelData[Vertex]
  
  var nvertices : Int = 0
	var nedges : Int = 0
	var nfaces : Int = 0
	var ncells : Int = 0

	var vtov : CRS = null
	var vtoe : CRS = null
	var vtof : CRS = null
	var vtoc : CRS = null

	var etov : CRS = null
	var etof : CRS = null
	var etoc : CRS = null

	var ftov : CRS = null
	var ftoe : CRS = null
	var ftoc : CRS = null

	var ctov : CRS = null
	var ctoe : CRS = null
	var ctof : CRS = null
	var ctoc : CRS = null
} 

//设置package包名称以及导入依赖的类
package ppl.delite.benchmarking.sorting.tpch.util

import collection.mutable.{ArrayBuffer, HashMap}

object PerformanceTimer
{
  val currentTimer = new HashMap[String, Long]
  val times = new HashMap[String, ArrayBuffer[Double]]

  def start(component: String, printMessage: Boolean = true) {
    if (!times.contains(component)) {
      times += component -> new ArrayBuffer[Double]()
    }
    if (printMessage) println("[METRICS]: Timing " + component + " #" + times(component).size + " started")
    currentTimer += component -> System.currentTimeMillis
  }

  def stop(component: String, printMessage: Boolean = true) {
    val x = (System.currentTimeMillis - currentTimer(component)) / 1000D
    times(component) += x
    if (printMessage) println("[METRICS]: Timing " + component + " #" + (times(component).size - 1) + " stopped")
  }

  def totalTime(component: String) {
    val total = times(component).toList.reduceLeft[Double](_+_)
    println("[METRICS]: total time for component " + component + ": " + total)
  }

  def clearAll() {
    for((k,v) <- times) {
      v.clear
    }
  }

  def print(component: String) {
    val timeStr = times.get(component) map { "[METRICS]: Latest time for component " + component + ": " +  _.last.formatted("%.6f") + "s" }
    println(timeStr getOrElse "[METRICS]: No data for component " + component)
  }

} 

//设置package包名称以及导入依赖的类
import collection.mutable.HashMap
import scala.util.Try

case class User(name : String, roles: List[String])

case class UserRepository(userDictionary: HashMap[Int,User]){
    def findUser(id: Int): User = { 
        if (userDictionary.keySet.exists(_ == id)){
            userDictionary(id)
        } else {
            null
        }
    }
}

object GetRolesById {
    def tryToInt( s: String ) = Try(s.toInt).getOrElse(-1)
    def main(args:Array[String]):Unit = {
        val userDictInit = HashMap(1 -> User("mickey",List("admin","content manager")),2 -> User("donald",List("user")))
        val userRepository = UserRepository(userDictInit)
        if (!args.isEmpty){
            val user = userRepository.findUser(tryToInt(args(0)))
            if (user!= null) {
                user.roles.map(x => println("Role: "+x))
            }
        }
    }
} 

//设置package包名称以及导入依赖的类
package com.twitter.finagle.stats

import collection.mutable.HashMap
import com.twitter.conversions.time._
import com.twitter.finagle.netty3.Conversions._
import com.twitter.finagle.util.DefaultTimer
import com.twitter.util.{Timer, TimerTask}
import java.util.logging.Logger

class JavaLoggerStatsReceiver(logger: Logger, timer: Timer)
  extends StatsReceiverWithCumulativeGauges
{
  val repr = logger
  var timerTasks = new HashMap[Seq[String], TimerTask]

  // Timer here will never be released. This is ok since this class
  // is used for debugging only.
  def this(logger: Logger) = this(logger, DefaultTimer.twitter)

  def stat(name: String*) = new Stat {
    def add(value: Float) {
      logger.info("%s add %f".format(formatName(name), value))
    }
  }

  def counter(name: String*) = new Counter {
    def incr(delta: Int) {
      logger.info("%s incr %d".format(formatName(name), delta))
    }
  }

  protected[this] def registerGauge(name: Seq[String], f: => Float) = synchronized {
    deregisterGauge(name)

    timerTasks(name) = timer.schedule(10.seconds) {
      logger.info("%s %2f".format(formatName(name), f))
    }
  }

  protected[this] def deregisterGauge(name: Seq[String]) {
    timerTasks.remove(name) foreach { _.cancel() }
  }

  private[this] def formatName(description: Seq[String]) = {
    description mkString "/"
  }
}

object JavaLoggerStatsReceiver {
  def apply(): JavaLoggerStatsReceiver =
    new JavaLoggerStatsReceiver(Logger.getLogger("Finagle"))
}