scala实现设计模式之职责链模式

package com.linewell.modeldesgin.responsechain

/**
 * 职责链模式，自我感觉和akka的管理机制很像
 * Created by ctao on 2015/8/30.
 */

/**
 * 审批对象
 * @param amount 金额
 * @param number 编号
 * @param purpose 采购目的
 */
case class PurchaseRequest(amount: Double, number: Int, purpose: String)


/**
 * 抽象处理者，审批者类
 * @param name 审批人姓名
 */
abstract class Approve(name: String) {

    /**
     * 定义后继对象
     */
    protected var successor: Approve = _

    /**
     * 设置后继对象
     * @param approve 审批者类
     */
    def setSuccessor(approve: Approve) = successor = approve

    /**
     * 抽象处理审批请求方法
     * @param request 审批对象
     */
    def processRequest(request: PurchaseRequest): Unit
}

/**
 * 主任类
 * @param name 审批人姓名
 */
class Director(name: String) extends Approve(name) {
    override def processRequest(request: PurchaseRequest) = request.amount match {
        case x: Double if x < 50000 =>
            println(s"主任$name 审批采购单：" + request.number + ",金额：" + request.amount + "元，采购目的：" + request.purpose)
        case _ => this.successor.processRequest(request)
    }
}

/**
 * 副董事长类
 * @param name 审批人姓名
 */
class VicePresident(name: String) extends Approve(name) {
    override def processRequest(request: PurchaseRequest) = request.amount match {
        case x: Double if x < 100000 =>
            println(s"副董事长$name 审批采购单：" + request.number + ",金额：" + request.amount + "元，采购目的：" + request.purpose)
        case _ => this.successor.processRequest(request)
    }
}

/**
 * 董事长类
 * @param name 审批人姓名
 */
class President(name: String) extends Approve(name) {
    override def processRequest(request: PurchaseRequest) = request.amount match {
        case x: Double if x < 500000 =>
            println(s"董事长$name 审批采购单：" + request.number + ",金额：" + request.amount + "元，采购目的：" + request.purpose)
        case _ => this.successor.processRequest(request)
    }
}

/**
 * 董事会类
 * @param name 审批人姓名
 */
class Congress(name: String) extends Approve(name) {
    override def processRequest(request: PurchaseRequest) =
        println("召开董事会审批采购单：" + request.number + ",金额：" + request.amount + "元，采购目的：" + request.purpose)
}

package com.linewell.modeldesgin.responsechain

/**
 * 测试客户端
 * Created by ctao on 2015/8/30.
 */
object Client extends App {
    val ZH: Approve = new Director("周华")
    val YJY: Approve = new VicePresident("游建友")
    val WZX: Approve = new President("吴志雄")
    val meeting: Approve = new Congress("董事会")

    ZH.setSuccessor(YJY)
    YJY.setSuccessor(WZX)
    WZX.setSuccessor(meeting)


    ZH.processRequest(PurchaseRequest(45000, 1001, "大数据卡口项目"))
    ZH.processRequest(PurchaseRequest(60000, 1002, "服务器购置"))
    ZH.processRequest(PurchaseRequest(145000, 1003, "星环开科技专利购买"))
    ZH.processRequest(PurchaseRequest(1145000, 1004, "公司并购"))


}