任务依赖。

如多个任务都指定了相同ID的子任务，则这些任务都执行完毕才执行此子任务

doc/db/xxl_job_check.sql

@@ -0,0 +1,25 @@
+/*
+Navicat MySQL Data Transfer
+
+Source Server         : localhost
+Source Server Version : 50636
+Source Host           : localhost:3306
+Source Database       : xxl_job
+
+Target Server Type    : MYSQL
+Target Server Version : 50636
+File Encoding         : 65001
+
+Date: 2024-01-09 17:56:29
+*/
+
+SET FOREIGN_KEY_CHECKS=0;
+
+-- ----------------------------
+-- Table structure for `xxl_job_check`
+-- ----------------------------
+DROP TABLE IF EXISTS `xxl_job_check`;
+CREATE TABLE `xxl_job_check` (
+  `child_jobid` int(11) NOT NULL COMMENT '子任务id',
+  `done_jobid` int(11) NOT NULL COMMENT '已完成的父任务id'
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='子任务的前置任务检查。一旦检查完毕，删除此子任务行，并且运行此此任务。';

xxl-job-admin/src/main/java/com/xxl/job/admin/core/complete/XxlJobCompleter.java

@@ -1,17 +1,22 @@
 package com.xxl.job.admin.core.complete;
 
 import com.xxl.job.admin.core.conf.XxlJobAdminConfig;
+import com.xxl.job.admin.core.model.XxlJobCheck;
 import com.xxl.job.admin.core.model.XxlJobInfo;
 import com.xxl.job.admin.core.model.XxlJobLog;
 import com.xxl.job.admin.core.thread.JobTriggerPoolHelper;
 import com.xxl.job.admin.core.trigger.TriggerTypeEnum;
 import com.xxl.job.admin.core.util.I18nUtil;
+import com.xxl.job.admin.dao.XxlJobCheckDao;
 import com.xxl.job.core.biz.model.ReturnT;
 import com.xxl.job.core.context.XxlJobContext;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.text.MessageFormat;
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
 
 /**
  * @author xuxueli 2020-10-30 20:43:10
@@ -56,7 +61,10 @@ public class XxlJobCompleter {
                 for (int i = 0; i < childJobIds.length; i++) {
                     int childJobId = (childJobIds[i]!=null && childJobIds[i].trim().length()>0 && isNumeric(childJobIds[i]))?Integer.valueOf(childJobIds[i]):-1;
                     if (childJobId > 0) {
-
+                    	
+                    	//save and check dependency
+                    	if( ! saveAndCheckChild(xxlJobInfo.getId(), childJobId)) continue;
+                    	
                         JobTriggerPoolHelper.trigger(childJobId, TriggerTypeEnum.PARENT, -1, null, null, null);
                         ReturnT<String> triggerChildResult = ReturnT.SUCCESS;
 
@@ -87,7 +95,49 @@ public class XxlJobCompleter {
 
     }
 
-    private static boolean isNumeric(String str){
+  //save and check dependency
+    private static boolean saveAndCheckChild(int doneJobId, int childJobId) {
+    	logger.info("任务{}已完成，检查子任务{}前置", doneJobId, childJobId);
+    	XxlJobCheck check=new XxlJobCheck();
+    	check.setChildJobId(childJobId);
+    	check.setDoneJobId(doneJobId);
+		XxlJobCheckDao dao = XxlJobAdminConfig.getAdminConfig().getXxlJobCheckDao();
+		dao.save(check);
+		List<XxlJobCheck> done = dao.list(childJobId);
+		List<String> shouldDone=getAllPreJobId(childJobId);
+		for(XxlJobCheck each: done) {
+			shouldDone.remove(   each.getDoneJobId()+"");
+		}
+		boolean result = false;
+		if(shouldDone.size()==0) {
+			logger.info("子任务{}前置全部完成",childJobId);
+			if(dao.delete(childJobId) ==done.size()) {
+				logger.info("子任务{}前置满足，将要执行",childJobId);
+				result =true;
+			}else {
+				logger.info("子任务{}前置满足，已被执行！",childJobId);
+			}
+		}else {
+			logger.info("子任务{}等待前置{}完成中",childJobId, shouldDone);
+		}
+		return result;
+	}
+
+
+	private static List<String> getAllPreJobId(int childJobId) {
+		List<String> result = new LinkedList<>();
+		List<XxlJobInfo> pageList = XxlJobAdminConfig.getAdminConfig().getXxlJobInfoDao().pageList(0, Integer.MAX_VALUE, -1, -1, null, null, null);
+		for(XxlJobInfo info : pageList) {
+			for(String child: info.getChildJobId().split(",")) {
+				if(child.trim().equals(childJobId+"")) result.add(""+info.getId());
+			}
+		}
+		logger.info("{}的前置任务id：{}", childJobId, result.toString() );
+		return result;
+	}
+
+
+	private static boolean isNumeric(String str){
         try {
             int result = Integer.valueOf(str);
             return true;

xxl-job-admin/src/main/java/com/xxl/job/admin/core/conf/XxlJobAdminConfig.java

@@ -69,6 +69,9 @@ public class XxlJobAdminConfig implements InitializingBean, DisposableBean {
 
     // dao, service
 
+    @Resource
+    private XxlJobCheckDao xxlJobCheckDao;
+    
     @Resource
     private XxlJobLogDao xxlJobLogDao;
     @Resource
@@ -155,4 +158,8 @@ public class XxlJobAdminConfig implements InitializingBean, DisposableBean {
         return jobAlarmer;
     }
 
+	public XxlJobCheckDao getXxlJobCheckDao() {
+		return xxlJobCheckDao;
+	}
+
 }

xxl-job-admin/src/main/java/com/xxl/job/admin/core/model/XxlJobCheck.java

@@ -0,0 +1,30 @@
+package com.xxl.job.admin.core.model;
+
+import java.util.Date;
+
+/**
+ * xxl-job child job's pre job check
+ * @author xinglj  2024
+ */
+public class XxlJobCheck {
+
+	private int childJobId, doneJobId;
+
+	public int getChildJobId() {
+		return childJobId;
+	}
+
+	public void setChildJobId(int childJobId) {
+		this.childJobId = childJobId;
+	}
+
+	public int getDoneJobId() {
+		return doneJobId;
+	}
+
+	public void setDoneJobId(int doneJobId) {
+		this.doneJobId = doneJobId;
+	}
+
+
+}

xxl-job-admin/src/main/java/com/xxl/job/admin/dao/XxlJobCheckDao.java

@@ -0,0 +1,26 @@
+package com.xxl.job.admin.dao;
+
+import com.xxl.job.admin.core.model.XxlJobCheck;
+import com.xxl.job.admin.core.model.XxlJobLog;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * job check
+ */
+@Mapper
+public interface XxlJobCheckDao {
+
+	// exist jobId not use jobGroup, not exist use jobGroup
+	public List<XxlJobCheck> list(@Param("childJobId") int childJobId);
+
+	public long save(XxlJobCheck xxlJobCheck);
+	
+	public int delete(@Param("childJobId") int childJobId);
+ 
+
+}

xxl-job-admin/src/main/resources/i18n/message_zh_CN.properties

@@ -122,7 +122,7 @@ jobinfo_field_alarmemail=报警邮件
 jobinfo_field_alarmemail_placeholder=请输入报警邮件，多个邮件地址则逗号分隔
 jobinfo_field_executorRouteStrategy=路由策略
 jobinfo_field_childJobId=子任务ID
-jobinfo_field_childJobId_placeholder=请输入子任务的任务ID,如存在多个则逗号分隔
+jobinfo_field_childJobId_placeholder=请输入子任务的任务ID,如存在多个则逗号分隔。如多个任务都指定了相同ID的子任务，则这些任务都执行完毕才执行此子任务
 jobinfo_field_executorBlockStrategy=阻塞处理策略
 jobinfo_field_executorFailRetryCount=失败重试次数
 jobinfo_field_executorFailRetryCount_placeholder=失败重试次数，大于零时生效

xxl-job-admin/src/main/resources/mybatis-mapper/XxlJobCheckMapper.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
+	"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.xxl.job.admin.dao.XxlJobCheckDao">
+	
+	<resultMap id="XxlJobCheck" type="com.xxl.job.admin.core.model.XxlJobCheck" >
+		<result column="child_jobid" property="childJobId" />
+		<result column="done_jobid" property="doneJobId" />
+	</resultMap>
+
+
+	<select id="list" resultMap="XxlJobCheck">
+		SELECT  t.child_jobid, t.done_jobid
+		FROM xxl_job_check AS t WHERE child_jobid=#{childJobId}
+		ORDER BY t.done_jobId 
+	</select>
+	
+	
+	<insert id="save" parameterType="com.xxl.job.admin.core.model.XxlJobCheck"  >
+		INSERT INTO xxl_job_check (
+			`child_jobid`,
+			`done_jobid`
+		 
+		) VALUES (
+			#{childJobId},
+			#{doneJobId}
+		);
+		 
+	</insert>
+ 
+	
+	<delete id="delete" >
+		delete from xxl_job_check
+		WHERE child_jobid = #{childJobId}
+	</delete>
+
+
+</mapper>