简介
Camunda is a Java-based framework supporting BPMN for workflow and process automation, CMMN for Case Management and DMN for Business Decision Management.
重要概念
BPMN - Business Process Model and Notation (BPMN) is a standard for Workflow and Process Automation. Camunda supports the 2.0 version of BPMN.
/get-started/bpmn20/
CMMN - Case Management Model and Notation (CMMN) is a standard for Case Management. Camunda supports the 1.1 version of CMMN.
/get-started/cmmn11/
DMN - Decision Model and Notation (DMN) is a standard for Business Decision Management. Camunda supports the 1.1 version of DMN.
/get-started/dmn11/
工作流对比
关键人物介绍
Tom Baeyens - 创建了jbpm。离开JBoss后，jBPM的下一个版本jBPM5完全放弃了jBPM4的基础代码，基于Drools Flow重头来过，目前官网已经推出了jBPM6的beta版本；Tom Baeyens加入Alfresco后很快推出了新的基于jBPM4的开源工作流系统Activiti。末，Alfresco的Activity BPM 小组正经历一系列的转变：Tom Baeyens将不再领导Activity工程，决定离开Alfresco。camunda是Activity最大的贡献者之一（除Alfresco以外），同时也是它一个主要的执行咨询合作伙伴。camunda表示Activity可能太拘束于Alfresco对以文档为中心的工作流的需求，而忽视了Activity起步时的更为普遍的BPM平台，故而从Activiti分支建立了camunda BPM项目。
框架总览
流程引擎架构
框架示例
Camunda Tomcat 集成容器下载:
/download/
解压tomcat，切换到目录server\apache-tomcat-8.0.24\webapps，包含以下子目录：
·Camunda -- 管理功能模块，包含admin、cockpit、tasklist
·camunda-invoice – 发票审批demo
·engine-rest – 工作流程引擎Rest API模块
·Examples – 其他demo例子
数据库创建:
切换目录sql\create\选择对应sql脚本执行
tomcat配置修改:
切换到server\apache-tomcat-8.0.24\conf\目录
bpm-platform.xml
camunda自有配置维护文件。
可根据具体应用场景修改以下全局配置属性
<properties>
<property name="history">full</property>
<property name="databaseSchemaUpdate">true</property>
<property name="authorizationEnabled">true</property>
<property name="jobExecutorActivate">true</property>
<property name="jobExecutorDeploymentAware">true</property>
</properties>
tomcat配置修改:
切换到server\apache-tomcat-8.0.24\conf\目录
server.xml
tomcat容器管理配置维护文件。
<Resource name="jdbc/ProcessEngine"
auth="Container"
type="javax.sql.DataSource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
uniqueResourceName="process-engine"
driverClassName="oracle.jdbc.driver.OracleDriver"
url="jdbc:oracle:thin:@127.0.0.1:1521:camunda"
defaultTransactionIsolation="READ_COMMITTED"
username="camunda"
password="123456"
maxActive="20"
minIdle="5"
removeAbandoned="true"
removeAbandonedTimeout="60"
testOnBorrow="true"
validationQuery="select count(1) from dual"
logAbandoned="true"/>
应用集成
添加依赖包
compile "org.camunda.bpm:camunda-engine:7.7.0"
compile "org.camunda.bpm:camunda-engine-spring:7.7.0"
添加spring bean
<bean> <property name="dataSource" ref="dataSource" /></bean><bean> <property name="processEngineName" value="engine" /> <property name="historyLevel" value="HISTORY_LEVEL_FULL"/> <property name="jobExecutorDeploymentAware" value="true"/> <property name="dataSource" ref="dataSource" /> <property name="transactionManager" ref="camundaTransactionManager" /> <property name="databaseSchemaUpdate" value="true" /> <property name="jobExecutorActivate" value="true" /> <property name="deploymentResources" value="classpath:*.bpmn" /></bean><bean> <property name="processEngineConfiguration" ref="processEngineConfiguration" /></bean><bean factory-bean="processEngine" factory-method="getRepositoryService" /><bean factory-bean="processEngine" factory-method="getRuntimeService" /><bean factory-bean="processEngine" factory-method="getTaskService" /><bean factory-bean="processEngine" factory-method="getHistoryService" /><bean factory-bean="processEngine" factory-method="getManagementService" />
modeler流程文件
将modeler设计流程模板放到应用工程resources目录或者子目录下。
用户集成方式
Camunda自有user体系
优：无需改动
缺：灵活性差，运维成本高
使用ldap用户集成
优：可和支持ldap功能对接
缺：依赖ldap功能限制
通过插件扩展用户体系
优：通过扩展能实现定制化需求
缺：对camunda熟悉，开发成本高
只使用workflow节点流转功能
优：应用灵活，可满足不同业务需求
缺：camunda部分丰富功能无法使用，可能重新开发框架存在组件
Job Executor
文档地址:/manual/7.7/user-guide/process-engine/the-job-executor/
Job 激活配置:<property name="jobExecutorActivate" value="true" />
job 工作架构：
同构集群部署：
异构集群部署：
支持异构集群部署，部署node设置jobExecutorDeploymentAware=true
<property name="jobExecutorDeploymentAware">true</property>
附录
engine-rest api
/manual/7.7/reference/rest/
Web modeler
http://bpmn.io/toolkit/bpmn-js/walkthrough/
camunda get-started
/get-started/
Camunda Guid
/manual/7.7/introduction/
LDAP Identity Service
/manual/7.7/user-guide/process-engine/identity-service/
