scala实现设计模式之职责链模式

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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"))}
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