39.top10热门品类之自定义二次排序key

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本文为《Spark大型电商项目实战》系列文章之一，主要代码实现top10热门品类模块中的第四步：自定义二次排序key。

代码实现

第四步：自定义二次排序key

在包com.erik.sparkproject.spark中新建二次排序key的类CategorySortKey.java

package com.erik.sparkproject.spark;import scala.math.Ordered;/** * 品类二次排序key *  * 封装你要进行排序算法需要的几个字段；点击次数、下单次数和支付次数 * 实现Ordered接口要求的几个方法 *  * 跟其他key相比，如何来判定大于、大于等于、小于、小于等于 * 依次使用三个次数进行比较，如果某一个相等，那么就比较下一个 * * 自定义的二次排序key，必须要实现serializable接口，表明是可以序列化 的，否则会报错 * @author Erik * */public class CategorySortKey implements Ordered<CategorySortKey>, Serializable{    private static final long serialVersionUID = -565992549650791884L;    private long clickCount;    private long orderCount;    private long payCount;    //使用右键-source-Generate Constructor using Fields进行构造方法    public CategorySortKey(long clickCount, long orderCount, long payCount) {        super();        this.clickCount = clickCount;        this.orderCount = orderCount;        this.payCount = payCount;    }    public boolean $greater(CategorySortKey other) {        if(clickCount > other.getClickCount()) {            return true;        }else if(clickCount == other.getClickCount() &&                 orderCount > other.getOrderCount()) {            return true;        }else if(clickCount == other.getClickCount() &&                 orderCount == other.getOrderCount() &&                payCount > other.getPayCount()) {            return true;        }        return false;    }    public boolean $greater$eq(CategorySortKey other) {        if($greater(other)) {            return true;        }else if(clickCount == other.getClickCount() &&                 orderCount == other.getOrderCount() &&                payCount == other.getPayCount()) {            return true;        }        return false;    }    public boolean $less(CategorySortKey other) {        if(clickCount < other.getClickCount()) {            return true;        }else if(clickCount == other.getClickCount() &&                 orderCount < other.getOrderCount()) {            return true;        }else if(clickCount == other.getClickCount() &&                 orderCount == other.getOrderCount() &&                payCount < other.getPayCount()) {            return true;        }        return false;    }    public boolean $less$eq(CategorySortKey other) {        if($less(other)) {            return true;        }else if(clickCount == other.getClickCount() &&                 orderCount == other.getOrderCount() &&                payCount == other.getPayCount()) {            return true;        }        return false;    }    public int compare(CategorySortKey other) {        if(clickCount - other.getClickCount() != 0) {            return (int)(clickCount - other.getClickCount());        }else if(orderCount - other.getOrderCount() != 0) {            return (int)(orderCount - other.getOrderCount());        }else if(payCount - other.getPayCount() != 0){            return (int)(payCount - other.getPayCount());        }        return 0;    }    public int compareTo(CategorySortKey other) {        if(clickCount - other.getClickCount() != 0) {            return (int)(clickCount - other.getClickCount());        }else if(orderCount - other.getOrderCount() != 0) {            return (int)(orderCount - other.getOrderCount());        }else if(payCount - other.getPayCount() != 0){            return (int)(payCount - other.getPayCount());        }        return 0;    }    public long getClickCount() {        return clickCount;    }    public void setClickCount(long clickCount) {        this.clickCount = clickCount;    }    public long getOrderCount() {        return orderCount;    }    public void setOrderCount(long orderCount) {        this.orderCount = orderCount;    }    public long getPayCount() {        return payCount;    }    public void setPayCount(long payCount) {        this.payCount = payCount;    }}

《Spark 大型电商项目实战》源码：https://github.com/Erik-ly/SprakProject

本文为《Spark大型电商项目实战》系列文章之一,
更多文章：Spark大型电商项目实战：http://blog.csdn.net/u012318074/article/category/6744423

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