Liferay7 BPM门户开发之3: Activiti开发环境搭建

下载地址：

http://activiti.org/download.html

源码：

https://github.com/Activiti/Activiti

环境准备(检查项)：

• • JDK 1.7 + JAVA_HOME ：java -version
  • 下载 Eclipse Indigo +
  • 拷贝activiti-explorer.war 到 Tomcat/webapps目录
  • 运行Tomcat/bin目录startup.bat or startup.sh
  • 不修改Tomcat http端口情况下访问：http://localhost:8080/activiti-explorer

  • 如果不想使用in-memory H2 database（默认演示数据库），修改WEB-INF/classes下文件db.properties；
    默认情况下，会创建user and groups, process definitions and models演示数据，如果不想建立，则设置WEB-INF/classes/engine.properties文件，修改为false

  • jar包依赖下载，通过Maven：mvn dependency:copy-dependencies on a module of the Activiti source code.
  • jar包依赖下载，通过放入classpath方式（直接引入依赖）,下载地址:http://download.csdn.net/detail/starcrm/9650018

    • org.activiti:activiti-engine:jar:5.17.0
      +- org.activiti:activiti-bpmn-converter:jar:5.17.0:compile
      | \- org.activiti:activiti-bpmn-model:jar:5.17.0:compile
      | +- com.fasterxml.jackson.core:jackson-core:jar:2.2.3:compile
      | \- com.fasterxml.jackson.core:jackson-databind:jar:2.2.3:compile
      | \- com.fasterxml.jackson.core:jackson-annotations:jar:2.2.3:compile
      +- org.activiti:activiti-process-validation:jar:5.17.0:compile
      +- org.activiti:activiti-image-generator:jar:5.17.0:compile
      +- org.apache.commons:commons-email:jar:1.2:compile
      | +- javax.mail:mail:jar:1.4.1:compile
      | \- javax.activation:activation:jar:1.1:compile
      +- org.apache.commons:commons-lang3:jar:3.3.2:compile
      +- org.mybatis:mybatis:jar:3.2.5:compile
      +- org.springframework:spring-beans:jar:4.0.6.RELEASE:compile
      | \- org.springframework:spring-core:jar:4.0.6.RELEASE:compile
      +- joda-time:joda-time:jar:2.6:compile
      +- org.slf4j:slf4j-api:jar:1.7.6:compile
      +- org.slf4j:jcl-over-slf4j:jar:1.7.6:compile

• • 演示用户ID

UserId	Password	Security roles
kermit	kermit	admin
gonzo	gonzo	manager
fozzie	fozzie	user

 

开发准备：

配置项：activiti.cfg.xml

Spring配置：

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans.xsd">

  <bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">

    <property name="jdbcUrl" value="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000" />
    <property name="jdbcDriver" value="org.h2.Driver" />
    <property name="jdbcUsername" value="sa" />
    <property name="jdbcPassword" value="" />

    <property name="databaseSchemaUpdate" value="true" />

    <property name="jobExecutorActivate" value="false" />
    <property name="asyncExecutorEnabled" value="true" />
    <property name="asyncExecutorActivate" value="false" />

    <property name="mailServerHost" value="mail.my-corp.com" />
    <property name="mailServerPort" value="5025" />
  </bean>

</beans>

• 一般情况可以这样创建引擎实例（即读取activiti.cfg.xml）：ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine()
• 也可以使用beanid：ProcessEngineConfiguration.createProcessEngineConfigurationFromResource(String resource, String beanName);
• 也可以通过程序设置：

ProcessEngine processEngine = ProcessEngineConfiguration.createStandaloneInMemProcessEngineConfiguration()
  .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_FALSE)
  .setJdbcUrl("jdbc:h2:mem:my-own-db;DB_CLOSE_DELAY=1000")
  .setAsyncExecutorEnabled(true)
  .setAsyncExecutorActivate(false)
  .buildProcessEngine();

DBCP 数据连接方式

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" >
  <property name="driverClassName" value="com.mysql.jdbc.Driver" />
  <property name="url" value="jdbc:mysql://localhost:3306/activiti" />
  <property name="username" value="activiti" />
  <property name="password" value="activiti" />
  <property name="defaultAutoCommit" value="false" />
</bean>

<bean id="processEngineConfiguration" class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration">

    <property name="dataSource" ref="dataSource" />
    ...

JNDI Datasource数据连接方式

配置db.properties配置JNDI datasource：
activiti-webapp-explorer2/src/webapp/WEB-INF/activiti-standalone-context.xml
activiti-webapp-rest2/src/main/resources/activiti-context.xml

删除 beans named "dbProperties" and "dataSource".
添加：

<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="java:comp/env/jdbc/activitiDB"/>
</bean>

替换activiti-webapp-explorer2/src/main/webapp/META-INF/context.xml：

<Context antiJARLocking="true" path="/activiti-explorer2">
    <Resource auth="Container"
              name="jdbc/activitiDB"
              type="javax.sql.DataSource"
              scope="Shareable"
              description="JDBC DataSource"
              url="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000"
              driverClassName="org.h2.Driver"
              username="sa"
              password=""
              defaultAutoCommit="false"
              initialSize="5"
              maxWait="5000"
              maxActive="120"
              maxIdle="5"/>
</Context>

替换activiti-webapp-rest2/src/main/webapp/META-INF/context.xml ：

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/activiti-rest2">
    <Resource auth="Container"
              name="jdbc/activitiDB"
              type="javax.sql.DataSource"
              scope="Shareable"
              description="JDBC DataSource"
              url="jdbc:h2:mem:activiti;DB_CLOSE_DELAY=-1"
              driverClassName="org.h2.Driver"
              username="sa"
              password=""
              defaultAutoCommit="false"
              initialSize="5"
              maxWait="5000"
              maxActive="120"
              maxIdle="5"/>
</Context>

Tomcat 环境下, the JNDI resource：

$CATALINA_BASE/conf/[enginename]/[hostname]/[warname].xml

$CATALINA_BASE/conf/Catalina/localhost/activiti-explorer.xml

<?xml version="1.0" encoding="UTF-8"?>
    <Context antiJARLocking="true" path="/activiti-explorer2">
        <Resource auth="Container"
            name="jdbc/activitiDB"
            type="javax.sql.DataSource"
            description="JDBC DataSource"
            url="jdbc:mysql://localhost:3306/activiti"
            driverClassName="com.mysql.jdbc.Driver"
            username="sa"
            password=""
            defaultAutoCommit="false"
            initialSize="5"
            maxWait="5000"
            maxActive="120"
            maxIdle="5"/>
        </Context>

支持的数据库

databases ：

Activiti database type	Example JDBC URL	Notes
h2	jdbc:h2:tcp://localhost/activiti	Default configured database
mysql	jdbc:mysql://localhost:3306/activiti?autoReconnect=true	Tested using mysql-connector-java database driver
oracle	jdbc:oracle:thin:@localhost:1521:xe
postgres	jdbc:postgresql://localhost:5432/activiti
db2	jdbc:db2://localhost:50000/activiti
mssql	jdbc:sqlserver://localhost:1433;databaseName=activiti (jdbc.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver)OR jdbc:jtds:sqlserver://localhost:1433/activiti (jdbc.driver=net.sourceforge.jtds.jdbc.Driver)	Tested using Microsoft JDBC Driver 4.0 (sqljdbc4.jar) and JTDS Driver

建立数据库表和索引的方式1：通过程序建立

• Add the activiti-engine jars to your classpath

• Add a suitable database driver,比如mysql-connector-java

• 添加配置文件 (activiti.cfg.xml) to your classpath

• Execute the main method of the DbSchemaCreate class

建立数据库表和索引的方式2：运行SQL脚本

SQL脚本在 database/create 目录

前缀缩写含义

• ACT_RE_*: RE stands for repository.

• ACT_RU_*: RU stands for runtime. runtime data of process instances, user tasks, variables, jobs, etc.

• ACT_ID_*: ID stands for identity. users, groups...

• ACT_HI_*: HI stands for history. past process instances, variables, tasks...

• ACT_GE_*: general data, which is used in various use cases.

主要的类

ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();

RuntimeService runtimeService = processEngine.getRuntimeService();
RepositoryService repositoryService = processEngine.getRepositoryService();
TaskService taskService = processEngine.getTaskService();
ManagementService managementService = processEngine.getManagementService();
IdentityService identityService = processEngine.getIdentityService();
HistoryService historyService = processEngine.getHistoryService();
FormService formService = processEngine.getFormService();

通过程序部署流程

新建 xml file VacationRequest.bpmn20.xml in the src/test/resources/org/activiti/test resource folder

<?xml version="1.0" encoding="UTF-8" ?>
<definitions id="definitions"
             targetNamespace="http://activiti.org/bpmn20"
             xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:activiti="http://activiti.org/bpmn">

  <process id="vacationRequest" name="Vacation request">

    <startEvent id="request" activiti:initiator="employeeName">
      <extensionElements>
        <activiti:formProperty id="numberOfDays" name="Number of days" type="long" value="1" required="true"/>
        <activiti:formProperty id="startDate" name="First day of holiday (dd-MM-yyy)" datePattern="dd-MM-yyyy hh:mm" type="date" required="true" />
        <activiti:formProperty id="vacationMotivation" name="Motivation" type="string" />
      </extensionElements>
    </startEvent>
    <sequenceFlow id="flow1" sourceRef="request" targetRef="handleRequest" />

    <userTask id="handleRequest" name="Handle vacation request" >
      <documentation>
        ${employeeName} would like to take ${numberOfDays} day(s) of vacation (Motivation: ${vacationMotivation}).
      </documentation>
      <extensionElements>
         <activiti:formProperty id="vacationApproved" name="Do you approve this vacation" type="enum" required="true">
          <activiti:value id="true" name="Approve" />
          <activiti:value id="false" name="Reject" />
        </activiti:formProperty>
        <activiti:formProperty id="managerMotivation" name="Motivation" type="string" />
      </extensionElements>
      <potentialOwner>
        <resourceAssignmentExpression>
          <formalExpression>management</formalExpression>
        </resourceAssignmentExpression>
      </potentialOwner>
    </userTask>
    <sequenceFlow id="flow2" sourceRef="handleRequest" targetRef="requestApprovedDecision" />

    <exclusiveGateway id="requestApprovedDecision" name="Request approved?" />
    <sequenceFlow id="flow3" sourceRef="requestApprovedDecision" targetRef="sendApprovalMail">
      <conditionExpression xsi:type="tFormalExpression">${vacationApproved == 'true'}</conditionExpression>
    </sequenceFlow>

    <task id="sendApprovalMail" name="Send confirmation e-mail" />
    <sequenceFlow id="flow4" sourceRef="sendApprovalMail" targetRef="theEnd1" />
    <endEvent id="theEnd1" />

    <sequenceFlow id="flow5" sourceRef="requestApprovedDecision" targetRef="adjustVacationRequestTask">
      <conditionExpression xsi:type="tFormalExpression">${vacationApproved == 'false'}</conditionExpression>
    </sequenceFlow>

    <userTask id="adjustVacationRequestTask" name="Adjust vacation request">
      <documentation>
        Your manager has disapproved your vacation request for ${numberOfDays} days.
        Reason: ${managerMotivation}
      </documentation>
      <extensionElements>
        <activiti:formProperty id="numberOfDays" name="Number of days" value="${numberOfDays}" type="long" required="true"/>
        <activiti:formProperty id="startDate" name="First day of holiday (dd-MM-yyy)" value="${startDate}" datePattern="dd-MM-yyyy hh:mm" type="date" required="true" />
        <activiti:formProperty id="vacationMotivation" name="Motivation" value="${vacationMotivation}" type="string" />
        <activiti:formProperty id="resendRequest" name="Resend vacation request to manager?" type="enum" required="true">
          <activiti:value id="true" name="Yes" />
          <activiti:value id="false" name="No" />
        </activiti:formProperty>
      </extensionElements>
      <humanPerformer>
        <resourceAssignmentExpression>
          <formalExpression>${employeeName}</formalExpression>
        </resourceAssignmentExpression>
      </humanPerformer>
    </userTask>
    <sequenceFlow id="flow6" sourceRef="adjustVacationRequestTask" targetRef="resendRequestDecision" />

    <exclusiveGateway id="resendRequestDecision" name="Resend request?" />
    <sequenceFlow id="flow7" sourceRef="resendRequestDecision" targetRef="handleRequest">
      <conditionExpression xsi:type="tFormalExpression">${resendRequest == 'true'}</conditionExpression>
    </sequenceFlow>

     <sequenceFlow id="flow8" sourceRef="resendRequestDecision" targetRef="theEnd2">
      <conditionExpression xsi:type="tFormalExpression">${resendRequest == 'false'}</conditionExpression>
    </sequenceFlow>
    <endEvent id="theEnd2" />

  </process>

</definitions>

部署：

package activitiLearn;

import org.activiti.engine.ProcessEngine;
import org.activiti.engine.ProcessEngines;
import org.activiti.engine.RepositoryService;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

public class test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        PropertyConfigurator.configure("bin/log4j.properties");
        Logger log=Logger.getLogger(test.class);
        ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
        RepositoryService repositoryService = processEngine.getRepositoryService();
        repositoryService.createDeployment()
          .addClasspathResource("bpmn20/VacationRequest.bpmn20.xml")
          .deploy();

        log.info("Number of process definitions: " + repositoryService.createProcessDefinitionQuery().count());
    }

}

输出:

2016-10-10 21:04:55 INFO [org.activiti.engine.ProcessEngines] Initializing process engine using configuration 'file:/D:/workspace/activitiLearn/bin/activiti.cfg.xml'
2016-10-10 21:04:55 INFO [org.activiti.engine.ProcessEngines] initializing process engine for resource file:/D:/workspace/activitiLearn/bin/activiti.cfg.xml
2016-10-10 21:04:56 INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] Loading XML bean definitions from resource loaded through InputStream
2016-10-10 21:04:58 INFO [org.activiti.engine.impl.db.DbSqlSession] performing create on engine with resource org/activiti/db/create/activiti.h2.create.engine.sql
2016-10-10 21:04:58 INFO [org.activiti.engine.impl.db.DbSqlSession] performing create on history with resource org/activiti/db/create/activiti.h2.create.history.sql
2016-10-10 21:04:58 INFO [org.activiti.engine.impl.db.DbSqlSession] performing create on identity with resource org/activiti/db/create/activiti.h2.create.identity.sql
2016-10-10 21:04:58 INFO [org.activiti.engine.impl.ProcessEngineImpl] ProcessEngine default created
2016-10-10 21:04:58 INFO [org.activiti.engine.ProcessEngines] initialised process engine default
2016-10-10 21:04:58 INFO [org.activiti.engine.impl.bpmn.deployer.BpmnDeployer] Processing resource bpmn20/VacationRequest.bpmn20.xml
2016-10-10 21:04:58 INFO [org.test] Number of process definitions: 1

打开管理后台看看,已经成功部署了

开始一个流程实例：

Map<String, Object> variables = new HashMap<String, Object>();
variables.put("employeeName", "Kermit");
variables.put("numberOfDays", new Integer(4));
variables.put("vacationMotivation", "I'm really tired!");

RuntimeService runtimeService = processEngine.getRuntimeService();
ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("vacationRequest", variables);

// Verify that we started a new process instance
Log.info("Number of process instances: " + runtimeService.createProcessInstanceQuery().count());

查询任务：

TaskService taskService = processEngine.getTaskService();
List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("management").list();
for (Task task : tasks) {
  Log.info("Task available: " + task.getName());
}

完成任务：

Task task = tasks.get(0);

Map<String, Object> taskVariables = new HashMap<String, Object>();
taskVariables.put("vacationApproved", "false");
taskVariables.put("managerMotivation", "We have a tight deadline!");
taskService.complete(task.getId(), taskVariables);

流程挂起：

repositoryService.suspendProcessDefinitionByKey("vacationRequest");
try {
  runtimeService.startProcessInstanceByKey("vacationRequest");
} catch (ActivitiException e) {
  e.printStackTrace();
}

挂起后重启：

runtimeService.activateProcessInstanceXXX

任务查询：

只能实现AND逻辑

List<Task> tasks = taskService.createTaskQuery()
    .taskAssignee("kermit")
    .processVariableValueEquals("orderId", "0815")
    .orderByDueDate().asc()
    .list();

复杂逻辑比如OR逻辑需要自己写SQL

List<Task> tasks = taskService.createNativeTaskQuery()
  .sql("SELECT count(*) FROM " + managementService.getTableName(Task.class) + " T WHERE T.NAME_ = #{taskName}")
  .parameter("taskName", "gonzoTask")
  .list();

long count = taskService.createNativeTaskQuery()
  .sql("SELECT count(*) FROM " + managementService.getTableName(Task.class) + " T1, "
    + managementService.getTableName(VariableInstanceEntity.class) + " V1 WHERE V1.TASK_ID_ = T1.ID_")
  .count();

流程变量

一个流程实例可以有任意多的变量process variables，变量用来传递数据。

变量存储在数据表ACT_RU_VARIABLE

通过RuntimeService建立：ProcessInstance startProcessInstanceByKey(String processDefinitionKey, Map<String, Object> variables);

在实例运行时，也可以随时设置变量：

void setVariable(String executionId, String variableName, Object value);
void setVariableLocal(String executionId, String variableName, Object value);
void setVariables(String executionId, Map<String, ? extends Object> variables);
void setVariablesLocal(String executionId, Map<String, ? extends Object> variables);

Map<String, Object> getVariables(String executionId);
Map<String, Object> getVariablesLocal(String executionId);
Map<String, Object> getVariables(String executionId, Collection<String> variableNames);
Map<String, Object> getVariablesLocal(String executionId, Collection<String> variableNames);
Object getVariable(String executionId, String variableName);
<T> T getVariable(String executionId, String variableName, Class<T> variableClass);

execution.getVariables();
execution.getVariables(Collection<String> variableNames);
execution.getVariable(String variableName);

execution.setVariables(Map<String, object> variables);
execution.setVariable(String variableName, Object value);

TaskService也可以使用getVariables，这意味着can have local variables that are alive just for the duration of the task