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Liferay7 BPM门户开发之3: Activiti开发环境搭建

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12/01
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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

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