魔法值统一管理

问题：项目中存在大量的魔法值，如果某一个魔法值改变，需要修改量极大。

解决：可通过内部类的方式解决。同一类的魔法值声明至同一静态方法。

public class Constants {

    /**
     * es中基础信息
     */
    public static final class EsBaseInfo {
        public static final int SIZE = xxx;
        public static final int ZERO_SIZE = xxx;
    }

    /**
     * es中incident字段
     */
    public static final class EsIncidentFiled {
        public static final String ORDERINFO_STATUS_KEYWORD = "xxx";
        public static final String ORDERINFO_ORDERID = "xxx";
        public static final String SEVERITY = "xxx";
        public static final String STATUS = "xxx";
    }

    /**
     * es NptStatRtResource
     */
    public static final class EsNptStatRtResourceFiled {
        public static final String TIMESTAMP = "xxx";
        public static final String CONCERNED = "xxx";
    }

    /**
     * rtTenantTask
     */
    public static final class RtTenant {
        public static final String TENANT_ID = "xxx";
        public static final String COUNT = "xxx";
        public static final String ES_ORG_AGGR = "xxx";
        public static final String ES_STATUS_AGGR = "xxx";
        public static final String ES_SEVERITY_AGGR = "xxx";
        public static final String ORG = "xxx";
        public static final String ORG_ID = "xxx";
    }

}