上一篇文章 http://blog.csdn.net/quzishen/archive/2011/01/25/6163012.aspx 描述了一些常用的drools的語法標籤和一個模擬實例即發送積分的場景,這一片優化了一下代碼,在此貼一下,希望有這方面使用經驗的朋友多多交流溝通,指正不足。
通常而言,習慣上我們將規則放到文件系統中,比如以drl結尾的規則文件,現在我們要擴充一下,使其放到數據庫中,以供多臺服務器同時使用,同時依然保留文件系統的支持。
先看下一個接口:
- /**
- * 規則接口
- * @author quzishen
- */
- public interface PointRuleEngine {
- /**
- * 初始化規則引擎
- */
- public void initEngine();
- /**
- * 刷新規則引擎中的規則
- */
- public void refreshEnginRule();
- /**
- * 執行規則引擎
- * @param pointDomain 積分Fact
- */
- public void executeRuleEngine(final PointDomain pointDomain);
- }
實現過程沒有任何難度,兩種方式封裝過程只在於讀取規則的方式不同,代碼很簡單:
- package com.drools.demo.point;
- import <a href="http://lib.csdn.net/base/17" class='replace_word' title="Java EE知識庫" target='_blank' style='color:#df3434; font-weight:bold;'>Java</a>.io.File;
- import java.io.FileNotFoundException;
- import java.io.FileReader;
- import java.io.Reader;
- import java.io.StringReader;
- import java.util.ArrayList;
- import java.util.List;
- import org.drools.RuleBase;
- import org.drools.StatefulSession;
- import org.drools.compiler.PackageBuilder;
- import org.drools.spi.Activation;
- /**
- * 規則接口實現類
- *
- * @author quzishen
- */
- public class PointRuleEngineImpl implements PointRuleEngine {
- // ~~~ instance filed begin
- /** RuleBase */
- private RuleBase ruleBase;
- // ~~~ instance filed end
- /*
- * (non-Javadoc)
- * @see com.drools.demo.point.PointRuleEngine#initEngine()
- */
- public void initEngine() {
- // 設置時間格式
- System.setProperty("drools.dateformat", "yyyy-MM-dd HH:mm:ss");
- try {
- synchronized (this) {
- ruleBase = RuleBaseFacatory.getRuleBase();
- // 優先從DB加載規則,如果沒有加載到或者加載錯誤,則從文件系統加載
- PackageBuilder backageBuilder = getPackBuilderFromDrlDB();
- backageBuilder = null == backageBuilder ? getPackageBuilderFromDrlFile()
- : backageBuilder;
- ruleBase.addPackages(backageBuilder.getPackages());
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /*
- * (non-Javadoc)
- * @see com.drools.demo.point.PointRuleEngine#refreshEnginRule()
- */
- public void refreshEnginRule() {
- ruleBase = RuleBaseFacatory.getRuleBase();
- synchronized (ruleBase) {
- // 刪除所有的添加的Package
- org.drools.rule.Package[] packages = ruleBase.getPackages();
- for (org.drools.rule.Package pg : packages) {
- ruleBase.removePackage(pg.getName());
- }
- // 重新初始化規則引擎
- initEngine();
- }
- }
- /*
- * (non-Javadoc)
- * @see com.drools.demo.point.PointRuleEngine#executeRuleEngine(com.drools.demo.point.PointDomain)
- */
- public void executeRuleEngine(final PointDomain pointDomain) {
- if (null == ruleBase.getPackages() || 0 == ruleBase.getPackages().length) {
- return;
- }
- StatefulSession statefulSession = ruleBase.newStatefulSession();
- statefulSession.insert(pointDomain);
- // fire
- statefulSession.fireAllRules(new org.drools.spi.AgendaFilter() {
- public boolean accept(Activation activation) {
- return !activation.getRule().getName().contains("_test");
- }
- });
- statefulSession.dispose();
- }
- /**
- * 從Drl規則文件中讀取規則
- *
- * @return
- * @throws Exception
- */
- private PackageBuilder getPackageBuilderFromDrlFile() {
- // 裝載規則文件
- List<Reader> readers;
- try {
- readers = buildReadersFromDrlFile();
- // 裝載PackageBuilder
- return buildPackageBuilder(readers);
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- return null;
- } catch (Exception e) {
- e.printStackTrace();
- return null;
- }
- }
- /**
- * 從Drl規則DB中讀取規則
- *
- * @return
- * @throws Exception
- */
- private PackageBuilder getPackBuilderFromDrlDB() {
- // 裝載規則
- List<Reader> readers = buildReadersFromDrlDB();
- // 裝載PackageBuilder
- try {
- return buildPackageBuilder(readers);
- } catch (Exception e) {
- e.printStackTrace();
- return null;
- }
- }
- /**
- * 裝載db中的規則到List<Reader>
- *
- * @return
- */
- private List<Reader> buildReadersFromDrlDB() {
- List<Reader> readers = new ArrayList<Reader>();
- // 獲取腳本
- List<DroolsRuleDomain> drlRuleDomains = getRuleFromDB();
- if (null == drlRuleDomains) {
- return readers;
- }
- for (DroolsRuleDomain droolsRuleDomain : drlRuleDomains) {
- String ruleContext = droolsRuleDomain.getRuleContext();
- Reader br = new StringReader(ruleContext);
- readers.add(br);
- }
- return readers;
- }
- /**
- * 裝載PackageBuilder
- *
- * @param readers
- * @return
- * @throws Exception
- */
- private PackageBuilder buildPackageBuilder(List<Reader> readers)
- throws Exception {
- if (null == readers || 0 == readers.size()) {
- return null;
- }
- PackageBuilder backageBuilder = new PackageBuilder();
- for (Reader r : readers) {
- backageBuilder.addPackageFromDrl(r);
- }
- // 檢查腳本是否有問題
- if (backageBuilder.hasErrors()) {
- throw new Exception(backageBuilder.getErrors().toString());
- }
- return backageBuilder;
- }
- /**
- * 裝載規則文件到Reader中
- *
- * @return
- * @throws FileNotFoundException
- */
- private List<Reader> buildReadersFromDrlFile() throws FileNotFoundException {
- // 獲取腳本文件
- List<String> drlFilePath = getRuleDrlFile();
- // 裝載腳本文件
- return readRuleFromDrlFile(drlFilePath);
- }
- /**
- * 從規則文件中讀取規則
- *
- * @param drlFilePath 腳本文件路徑
- * @return
- * @throws FileNotFoundException
- */
- private List<Reader> readRuleFromDrlFile(List<String> drlFilePath)
- throws FileNotFoundException {
- if (null == drlFilePath || 0 == drlFilePath.size()) {
- return null;
- }
- List<Reader> readers = new ArrayList<Reader>();
- for (String ruleFilePath : drlFilePath) {
- readers.add(new FileReader(new File(ruleFilePath)));
- }
- return readers;
- }
- /**
- * 從數據庫中獲取規則腳本內容
- *
- * @return
- */
- private List<DroolsRuleDomain> getRuleFromDB() {
- // 測試代碼
- List<DroolsRuleDomain> droolsRuleDomains = new ArrayList<DroolsRuleDomain>();
- DroolsRuleDomain d1 = new DroolsRuleDomain();
- d1.setId(1);
- d1.setRuleContext("package com.drools.demo.point" + "/n" +
- "import com.drools.demo.point.PointDomain;" + "/n" +
- "rule birthdayPoint" + "/n" +
- "// 過生日,則加10分,並且將當月交易比數翻倍後再計算積分" + "/n" +
- "salience 100" + "/n" +
- "lock-on-active true" + "/n" +
- "when" + "/n" +
- "$pointDomain : PointDomain(birthDay == true)" + "/n" +
- "then" + "/n" +
- "pointDomain.setPoint(
- pointDomain.getUserName(),/"birthdayPoint/");" + "/n" +
- "end");
- d1.setRuleName("testRule");
- d1.setVersion(1);
- droolsRuleDomains.add(d1);
- return droolsRuleDomains;
- }
- /**
- * 獲取規則文件
- *
- * @return
- */
- private List<String> getRuleDrlFile() {
- List<String> drlFilePath = new ArrayList<String>();
- drlFilePath
- .add("D:/workspace2/DroolsDemo/src/com/drools/demo/point/addpoint.drl");
- drlFilePath
- .add("D:/workspace2/DroolsDemo/src/com/drools/demo/point/subpoint.drl");
- return drlFilePath;
- }
- }
其中的getRuleFromDB() 和 getRuleDrlFile() 兩個方法即可以重寫以接入個人系統,現在其中編寫的是測試代碼。
其他的文件與上篇文章相同:
RuleBaseFacatory
- package com.drools.demo.point;
- import org.drools.RuleBase;
- import org.drools.RuleBaseFactory;
- /**
- * RuleBaseFacatory 單實例RuleBase生成工具
- * @author quzishen
- */
- public class RuleBaseFacatory {
- private static RuleBase ruleBase;
- public static RuleBase getRuleBase(){
- return null != ruleBase ? ruleBase : RuleBaseFactory.newRuleBase();
- }
- }
DroolsRuleDomain
- package com.drools.demo.point;
- /**
- * 規則內容domain
- *
- * @author quzishen
- */
- public class DroolsRuleDomain {
- /** 數據庫記錄ID */
- private long id;
- /** 規則名稱 */
- private String ruleName;
- /** 規則正文 */
- private String ruleContext;
- /** 規則版本 */
- private int version;
- /** 規則腳本狀態 */
- private int status;
- public long getId() {
- return id;
- }
- public void setId(long id) {
- this.id = id;
- }
- public String getRuleName() {
- return ruleName;
- }
- public void setRuleName(String ruleName) {
- this.ruleName = ruleName;
- }
- public String getRuleContext() {
- return ruleContext;
- }
- public void setRuleContext(String ruleContext) {
- this.ruleContext = ruleContext;
- }
- public int getVersion() {
- return version;
- }
- public void setVersion(int version) {
- this.version = version;
- }
- public int getStatus() {
- return status;
- }
- public void setStatus(int status) {
- this.status = status;
- }
- }
PointDomain
- package com.drools.demo.point;
- /**
- * 積分計算對象
- * @author quzishen
- */
- public class PointDomain {
- // 用戶名
- private String userName;
- // 是否當日生日
- private boolean birthDay;
- // 增加積分數目
- private long point;
- // 當月購物次數
- private int buyNums;
- // 當月退貨次數
- private int backNums;
- // 當月購物總金額
- private double buyMoney;
- // 當月退貨總金額
- private double backMondy;
- // 當月信用卡還款次數
- private int billThisMonth;
- /**
- * 記錄積分發送流水,防止重複發放
- * @param userName 用戶名
- * @param type 積分發放類型
- */
- public void recordPointLog(String userName, String type){
- System.out.println("增加對"+userName+"的類型爲"+type+"的積分操作記錄.");
- }
- public String getUserName() {
- return userName;
- }
- public void setUserName(String userName) {
- this.userName = userName;
- }
- public boolean isBirthDay() {
- return birthDay;
- }
- public void setBirthDay(boolean birthDay) {
- this.birthDay = birthDay;
- }
- public long getPoint() {
- return point;
- }
- public void setPoint(long point) {
- this.point = point;
- }
- public int getBuyNums() {
- return buyNums;
- }
- public void setBuyNums(int buyNums) {
- this.buyNums = buyNums;
- }
- public int getBackNums() {
- return backNums;
- }
- public void setBackNums(int backNums) {
- this.backNums = backNums;
- }
- public double getBuyMoney() {
- return buyMoney;
- }
- public void setBuyMoney(double buyMoney) {
- this.buyMoney = buyMoney;
- }
- public double getBackMondy() {
- return backMondy;
- }
- public void setBackMondy(double backMondy) {
- this.backMondy = backMondy;
- }
- public int getBillThisMonth() {
- return billThisMonth;
- }
- public void setBillThisMonth(int billThisMonth) {
- this.billThisMonth = billThisMonth;
- }
- }
addpoint.drl
- package com.drools.demo.point
- import com.drools.demo.point.PointDomain;
- rule birthdayPoint
- // 過生日,則加10分,並且將當月交易比數翻倍後再計算積分
- salience 100
- lock-on-active true
- when
- $pointDomain : PointDomain(birthDay == true)
- then
- pointDomain.setPoint(
- pointDomain.getUserName(),"allFitPoint");
- end
subpoint.drl 與上一篇相同,請參見上一篇,此處省略篇幅略
測試代碼
Test
- package com.drools.demo.point;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- public class Test {
- /**
- * @param args
- * @throws IOException
- */
- public static void main(String[] args) throws IOException {
- PointRuleEngine pointRuleEngine = new PointRuleEngineImpl();
- boolean isStart = false;
- while(true){
- InputStream is = System.in;
- BufferedReader br = new BufferedReader(new InputStreamReader(is));
- String input = br.readLine();
- if (null != input && "s".equals(input)){
- System.out.println("初始化規則引擎...");
- pointRuleEngine.initEngine();
- isStart = true;
- System.out.println("初始化規則引擎結束.");
- } else if ("e".equals(input)){
- if (!isStart) {
- System.out.println("需要輸入s啓動");
- } else {
- final PointDomain pointDomain = new PointDomain();
- pointDomain.setUserName("hello kity");
- pointDomain.setBackMondy(100d);
- pointDomain.setBuyMoney(500d);
- pointDomain.setBackNums(1);
- pointDomain.setBuyNums(5);
- pointDomain.setBillThisMonth(5);
- pointDomain.setBirthDay(true);
- pointDomain.setPoint(0l);
- pointRuleEngine.executeRuleEngine(pointDomain);
- System.out.println("執行完畢BillThisMonth:"+pointDomain.getBillThisMonth());
- System.out.println("執行完畢BuyMoney:"+pointDomain.getBuyMoney());
- System.out.println("執行完畢BuyNums:"+pointDomain.getBuyNums());
- System.out.println("執行完畢規則引擎決定發送積分:"+pointDomain.getPoint());
- }
- } else if ("r".equals(input)){
- System.out.println("刷新規則文件...");
- pointRuleEngine.refreshEnginRule();
- isStart = true;
- System.out.println("刷新規則文件結束.");
- } else if ("q".equals(input)) {
- System.exit(0);
- }
- }
- }
- }