Drool 7 SpreadSheet Decision Template 笔记
1 Excel Decision table
1.1 很棒的示意图，来自https://blog.csdn.net/justlpf/article/details/128109731
1.2 参考URL
1.2.1 https://blog.csdn.net/justlpf/article/details/128109731
1.3 多sheet 模式
- 默认是用第一个sheet
- 如果要支持多sheet，需要创建一个同名的.properties文件
- sheets=Sheet1,Sheet2
1.4 sheet内主要内容
1.4.1 一个RuleSet ：注意RuleSet里面的定义都是对package有影响，不仅仅是excel文件
默认package 名就是Ruleset 名称
- 具体实现代码-final Package ruleset = new Package( (showPackage) ? rulesetName : null );
属性
- RuleSet
The package name for the generated DRL file. Optional, the default is rule_table. - Sequential
true or false. If true, then salience is used to ensure that rules fire from the top down. - SequentialMaxPriority
Optional, at most once. In sequential mode, this option is used to set the start value of the salience. If omitted, the default value is 65535. - SequentialMinPriorit
Optional, at most once. In sequential mode, this option is used to check if this minimum salience value is not violated. If omitted, the default value is 0. - EscapeQuotes
- NumericDisabled
If true, then a String representation is used for DRL instead of a double value from a Numeric cell. It would also skip additional numeric processing for the double value. - IgnoreNumericFormat
If true, then the format for numeric values is ignored - Import
可以多行 - Variables
可以多行 - Functions
可以多行 - Queries
可以多行 - Declare
可以多行 - Unit 实验性，不用
- Dialect
java or mvel. The dialect used in the actions of the decision table.
1.4.2 一个或者多个RuleTable
- 以空行分割多个RuleTable
- 无论CONDITION/RULE，值为空代表忽略
- metadata
- Code snippet and interpolated values for constructing a metadata entry for the rule.
- 没有google到例子
Properties 和rule 属性差不多，但注意salience 被priority代替
- PRIORITY An integer defining the salience value of the rule
- DATE-EFFECTIVE
Example: DATE-EFFECTIVE “4-Sep-2018” - DATE-EXPIRES
- NO-LOOP
- AGENDA-GROUP
- ACTIVATION-GROUP
- DURATION
- TIMER
- CALENDAR
- AUTO-FOCUS
- LOCK-ON-ACTIVE
- RULEFLOW-GROUP
1.5 excel 转换为drl文件的核心类是public class DefaultRuleSheetListener
1.5.1 核心函数buildRuleSet()
2 template
2.1 用途
- 使用外部存储的变量列表：如数据库、excel 生成drl文件
- 默认提供了从excel ，对象、list导入数据模式
2.2 相关生成drl的compiler
- ExternalSpreadsheetCompiler
- DataProviderCompiler
可以以DataProviderCompiler为父类，自行定义开发新的compiler - ObjectDataCompiler
- extends DataProviderCompiler
- 当对象有null值被引用的时候，DefaultGenerator如下代码可能返回空condition
String drl = String.valueOf( TemplateRuntime.execute( template,vars,factory,registry ) );