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activti之流程文件的部署
更新时间 2022-3-18 浏览1994次
我们的bpmn xml文件是如何通过引擎进行部署的呢？
文章概要： 1.bpmnParser解析器与解析处理器的初始化(关联bpmnParse工厂(核心)) 2.deploymentManager部署管理器的初始化与bpmnParser解析器的关联 3.仓库服务进行部署的调用(通过deploymentManager)
1、bpmn解析器及解析处理器的初始化
我们首先看
ProcessEngineConfigurationImpl的init方法里initBpmnParser()方法：
public void initBpmnParser() {
if (bpmnParser == null) {
bpmnParser = new BpmnParser();
}
if (bpmnParseFactory == null) {
bpmnParseFactory = new DefaultBpmnParseFactory();//该工厂用于创建bpmnParse
}
bpmnParser.setBpmnParseFactory(bpmnParseFactory);//解析工厂
bpmnParser.setActivityBehaviorFactory(activityBehaviorFactory);//行为工厂
bpmnParser.setListenerFactory(listenerFactory);//监听器工厂
List<BpmnParseHandler> parseHandlers = new ArrayList<BpmnParseHandler>();
if (getPreBpmnParseHandlers() != null) {
parseHandlers.addAll(getPreBpmnParseHandlers());
}
parseHandlers.addAll(getDefaultBpmnParseHandlers());
if (getPostBpmnParseHandlers() != null) {
parseHandlers.addAll(getPostBpmnParseHandlers());
}
BpmnParseHandlers bpmnParseHandlers = new BpmnParseHandlers();
bpmnParseHandlers.addHandlers(parseHandlers);
bpmnParser.setBpmnParserHandlers(bpmnParseHandlers);
}上面方法对bpmParser解析器进行了初始化及用到的相关工厂(bpmnParse解析工厂用于创建bpmnParse解析器(核心，用于xml convertToBpmnModel解析转换的调用和行为的设置)，行为类工厂用于创建行为，监听器工厂用于创建监听器)和一系列解析处理器(其实解析处理器用于设置元素行为,后面会分析)。
分前置、默认和后置处理器(后置主要用于加入适配activti5的解析处理器)，主要来看activti提供的默认的解析处理器有哪些：
public List<BpmnParseHandler> getDefaultBpmnParseHandlers() {
// Alphabetic list of default parse handler classes
List<BpmnParseHandler> bpmnParserHandlers = new ArrayList<BpmnParseHandler>();
bpmnParserHandlers.add(new BoundaryEventParseHandler());//边界事件解析处理器
bpmnParserHandlers.add(new BusinessRuleParseHandler());//业务规则解析处理器
bpmnParserHandlers.add(new CallActivityParseHandler());//调用流程解析处理器
bpmnParserHandlers.add(new CancelEventDefinitionParseHandler());//取消事件定义解析处理器
bpmnParserHandlers.add(new CompensateEventDefinitionParseHandler());//补偿事件定义解析处理器
bpmnParserHandlers.add(new EndEventParseHandler());//结束事件解析处理器
bpmnParserHandlers.add(new ErrorEventDefinitionParseHandler());//错误事件定义解析处理器
bpmnParserHandlers.add(new EventBasedGatewayParseHandler());//基于事件网关解析处理器
bpmnParserHandlers.add(new ExclusiveGatewayParseHandler());//排他网关解析处理器
bpmnParserHandlers.add(new InclusiveGatewayParseHandler());//包容网关解析处理器
bpmnParserHandlers.add(new IntermediateCatchEventParseHandler());//中间捕获事件解析处理器
bpmnParserHandlers.add(new IntermediateThrowEventParseHandler());//中间抛出事件解析处理器
bpmnParserHandlers.add(new ManualTaskParseHandler());//手动任务解析处理器
bpmnParserHandlers.add(new MessageEventDefinitionParseHandler());//消息事件定义解析处理器
bpmnParserHandlers.add(new ParallelGatewayParseHandler());//并行网关解析处理器
bpmnParserHandlers.add(new ProcessParseHandler());//流程解析处理器
bpmnParserHandlers.add(new ReceiveTaskParseHandler());//接收任务解析处理器
bpmnParserHandlers.add(new ScriptTaskParseHandler());//脚本任务解析处理器
bpmnParserHandlers.add(new SendTaskParseHandler());//发送任务解析处理器
bpmnParserHandlers.add(new SequenceFlowParseHandler());//线条解析处理
bpmnParserHandlers.add(new ServiceTaskParseHandler());//服务任务解析处理器
bpmnParserHandlers.add(new SignalEventDefinitionParseHandler());//信号事件定义解析处理器
bpmnParserHandlers.add(new StartEventParseHandler());//开始事件解析处理器
bpmnParserHandlers.add(new SubProcessParseHandler());//流程子任务解析处理器
bpmnParserHandlers.add(new EventSubProcessParseHandler());//事件子流程解析处理器
bpmnParserHandlers.add(new AdhocSubProcessParseHandler());//特殊子流程解析处理器
bpmnParserHandlers.add(new TaskParseHandler());//任务解析处理器
bpmnParserHandlers.add(new TimerEventDefinitionParseHandler());//定时事件定义解析处理器
bpmnParserHandlers.add(new TransactionParseHandler());//事务解析处理器
bpmnParserHandlers.add(new UserTaskParseHandler());//用户任务解析处理器
// Replace any default handler if the user wants to replace them
if (customDefaultBpmnParseHandlers != null) {//自定义的解析器
Map<Class<?>, BpmnParseHandler> customParseHandlerMap = new HashMap<Class<?>, BpmnParseHandler>();
for (BpmnParseHandler bpmnParseHandler : customDefaultBpmnParseHandlers) {
for (Class<?> handledType : bpmnParseHandler.getHandledTypes()) {
customParseHandlerMap.put(handledType, bpmnParseHandler);
}
}
for (int i = 0; i < bpmnParserHandlers.size(); i++) {
// All the default handlers support only one type
BpmnParseHandler defaultBpmnParseHandler = bpmnParserHandlers.get(i);
if (defaultBpmnParseHandler.getHandledTypes().size() != 1) {
StringBuilder supportedTypes = new StringBuilder();
for (Class<?> type : defaultBpmnParseHandler.getHandledTypes()) {
supportedTypes.append(" ").append(type.getCanonicalName()).append(" ");
}
throw new ActivitiException("The default BPMN parse handlers should only support one type, but " + defaultBpmnParseHandler.getClass() + " supports " + supportedTypes.toString()
+ ". This is likely a programmatic error");
} else {
Class<?> handledType = defaultBpmnParseHandler.getHandledTypes().iterator().next();
if (customParseHandlerMap.containsKey(handledType)) {//自定义是否覆盖了默认的，若覆盖了则用自定义的
BpmnParseHandler newBpmnParseHandler = customParseHandlerMap.get(handledType);
log.info("Replacing default BpmnParseHandler " + defaultBpmnParseHandler.getClass().getName() + " with " + newBpmnParseHandler.getClass().getName());
bpmnParserHandlers.set(i, newBpmnParseHandler);
}
}
}
}
return bpmnParserHandlers;
}我们查看两个处理器源码：
public class ParallelGatewayParseHandler extends AbstractActivityBpmnParseHandler<ParallelGateway> {
public Class<? extends BaseElement> getHandledType() {
return ParallelGateway.class;
}
protected void executeParse(BpmnParse bpmnParse, ParallelGateway gateway) {
gateway.setBehavior(bpmnParse.getActivityBehaviorFactory().createParallelGatewayActivityBehavior(gateway));
}
}
public class UserTaskParseHandler extends AbstractActivityBpmnParseHandler<UserTask> {
public Class<? extends BaseElement> getHandledType() {
return UserTask.class;
}
@Override
protected void executeParse(BpmnParse bpmnParse, UserTask userTask) {
userTask.setBehavior(bpmnParse.getActivityBehaviorFactory().createUserTaskActivityBehavior(userTask));
}
}
查看父类：
public abstract class AbstractActivityBpmnParseHandler<T extends FlowNode> extends AbstractFlowNodeBpmnParseHandler<T> {
@Override
public void parse(BpmnParse bpmnParse, BaseElement element) {
super.parse(bpmnParse, element);
if (element instanceof Activity && ((Activity) element).getLoopCharacteristics() != null) {
createMultiInstanceLoopCharacteristics(bpmnParse, (Activity) element);//多实例
}
}
....
}
继续看父类：
public abstract class AbstractFlowNodeBpmnParseHandler<T extends FlowNode> extends AbstractBpmnParseHandler<T> {
//该类为空
}
继续看父类：
public abstract class AbstractBpmnParseHandler<T extends BaseElement> implements BpmnParseHandler {
private static final Logger logger = LoggerFactory.getLogger(AbstractBpmnParseHandler.class);
public static final String PROPERTYNAME_EVENT_SUBSCRIPTION_DECLARATION = "eventDefinitions";
public static final String PROPERTYNAME_ERROR_EVENT_DEFINITIONS = "errorEventDefinitions";
public static final String PROPERTYNAME_TIMER_DECLARATION = "timerDeclarations";
public Set<Class<? extends BaseElement>> getHandledTypes() {
Set<Class<? extends BaseElement>> types = new HashSet<Class<? extends BaseElement>>();
types.add(getHandledType());
return types;
}
protected abstract Class<? extends BaseElement> getHandledType();
@SuppressWarnings("unchecked")
public void parse(BpmnParse bpmnParse, BaseElement element) {
T baseElement = (T) element;
executeParse(bpmnParse, baseElement);
}
protected abstract void executeParse(BpmnParse bpmnParse, T element);
....//省略
}可以看出顶级父类是用了设计模式之模版方法模式定义了抽象方法executeParse用于获取并设置其行为类,
发现处理器主要是用于给元素节点设置行为类。
先给出bpmn解析处理器最终调用路径为BpmnParse->execute()->bpmnParser.getBpmnParserHandlers(i).parseElement()。
后续我们会进行逐步讲解。
2、部署管理器的初始化与解析器的关联
有了解析器之后，那么在何时调用呢？我们可看到在init方法里还有一个初始化方法：
initDeployers();//部署相关工厂帮助类的初始化创建
看部署管理器相关的处理化源码：
public void initDeployers() {
if (this.deployers == null) {
this.deployers = new ArrayList<Deployer>();
//自定义前置部署处理
if (customPreDeployers != null) {
this.deployers.addAll(customPreDeployers);
}
//默认部署
this.deployers.addAll(getDefaultDeployers());
//自定义后置部署处理
if (customPostDeployers != null) {
this.deployers.addAll(customPostDeployers);
}
}
//部署管理器初始化
if (deploymentManager == null) {
deploymentManager = new DeploymentManager();
deploymentManager.setDeployers(deployers);
deploymentManager.setProcessDefinitionCache(processDefinitionCache);//流程定义缓存
deploymentManager.setProcessDefinitionInfoCache(processDefinitionInfoCache);//流程定义信息缓存
deploymentManager.setKnowledgeBaseCache(knowledgeBaseCache);//基础缓存
deploymentManager.setProcessEngineConfiguration(this);
deploymentManager.setProcessDefinitionEntityManager(processDefinitionEntityManager);//流程定义实体管理器
deploymentManager.setDeploymentEntityManager(deploymentEntityManager);//部署实体管理器
}
}然后主要看getDefaultDeployers():进行bpmn部署器的初始化：
public Collection<? extends Deployer> getDefaultDeployers() {
List<Deployer> defaultDeployers = new ArrayList<Deployer>();
//用于流程的部署
if (bpmnDeployer == null) {
bpmnDeployer = new BpmnDeployer();
}
//初始化bpmn部署依赖管理器(解析部署构建工厂进行了bpmnParser的关联)
initBpmnDeployerDependencies();
bpmnDeployer.setIdGenerator(idGenerator);
bpmnDeployer.setParsedDeploymentBuilderFactory(parsedDeploymentBuilderFactory);
bpmnDeployer.setBpmnDeploymentHelper(bpmnDeploymentHelper);
bpmnDeployer.setCachingAndArtifactsManager(cachingAndArtifactsManager);
bpmnDeployer.setProcessDefinitionDiagramHelper(processDefinitionDiagramHelper);
defaultDeployers.add(bpmnDeployer);
return defaultDeployers;
}可以看到创建了bpmnDeployer部署器，并初始化bpmn部署器相关的依赖：
public void initBpmnDeployerDependencies() {
if (parsedDeploymentBuilderFactory == null) {
parsedDeploymentBuilderFactory = new ParsedDeploymentBuilderFactory();//解析工厂初始化
}
bpmnParser引用
if (parsedDeploymentBuilderFactory.getBpmnParser() == null) {
parsedDeploymentBuilderFactory.setBpmnParser(bpmnParser);
}
if (timerManager == null) {
timerManager = new TimerManager();//定时器管理器
}
if (eventSubscriptionManager == null) {
eventSubscriptionManager = new EventSubscriptionManager();//事件订阅管理器
}
if (bpmnDeploymentHelper == null) {
bpmnDeploymentHelper = new BpmnDeploymentHelper();//流程部署帮助类
}
if (bpmnDeploymentHelper.getTimerManager() == null) {
bpmnDeploymentHelper.setTimerManager(timerManager);
}
if (bpmnDeploymentHelper.getEventSubscriptionManager() == null) {
bpmnDeploymentHelper.setEventSubscriptionManager(eventSubscriptionManager);
}
if (cachingAndArtifactsManager == null) {
cachingAndArtifactsManager = new CachingAndArtifactsManager();
}
if (processDefinitionDiagramHelper == null) {
processDefinitionDiagramHelper = new ProcessDefinitionDiagramHelper();
}
}可以看出在该方法里进行了bpmnParser的引用关联。并初始化了相关的(流程部署)帮助类和一些管理器(定时、事件订阅、部署缓存相关管理器、流程定义图片帮助类)。
DeploymentManager->bpmnDeployer->bpmnParser
3、仓库服务进行部署的调用
RepositoryService.createDeployment().deploy
public DeploymentBuilder createDeployment() {
return commandExecutor.execute(new Command<DeploymentBuilder>() {
@Override
public DeploymentBuilder execute(CommandContext commandContext) {
return new DeploymentBuilderImpl(RepositoryServiceImpl.this);
}
});
}
}
public Deployment deploy(DeploymentBuilderImpl deploymentBuilder) {
return commandExecutor.execute(new DeployCmd<Deployment>(deploymentBuilder));
}可以看下DeployCmd命令类：
在execute里调用了executeDeploy(commandContext)方法：
protected Deployment executeDeploy(CommandContext commandContext) {
//获取刚构建的部署对象
DeploymentEntity deployment = deploymentBuilder.getDeployment();
//设置部署当前时间
deployment.setDeploymentTime(commandContext.getProcessEngineConfiguration().getClock().getCurrentTime());
//在部署时会检测已部署的相同文件的最后一条记录，如果内容相同，则不会部署
if (deploymentBuilder.isDuplicateFilterEnabled()) {
//保存查到的集合
List<Deployment> existingDeployments = new ArrayList<Deployment>();
if (deployment.getTenantId() == null || ProcessEngineConfiguration.NO_TENANT_ID.equals(deployment.getTenantId())) {//TenantId不存在，通过部署名称查询数据库
//查ACT_RE_DEPLOYMENT该表
DeploymentEntity existingDeployment = commandContext.getDeploymentEntityManager().findLatestDeploymentByName(deployment.getName());
if (existingDeployment != null) {
existingDeployments.add(existingDeployment);
}
} else {//TenantId存在
List<Deployment> deploymentList = commandContext.getProcessEngineConfiguration().getRepositoryService().createDeploymentQuery().deploymentName(deployment.getName())
.deploymentTenantId(deployment.getTenantId()).orderByDeploymentId().desc().list();
if (!deploymentList.isEmpty()) {
existingDeployments.addAll(deploymentList);
}
}
DeploymentEntity existingDeployment = null;
if (!existingDeployments.isEmpty()) {
existingDeployment = (DeploymentEntity) existingDeployments.get(0);
}
//查到且和要部署的一致，则直接返回查出来的
if ((existingDeployment != null) && !deploymentsDiffer(deployment, existingDeployment)) {
return existingDeployment;
}
}
deployment.setNew(true);//设置为一个新的定义
// Save the data
//插入ACT_RE_DEPLOYMENT表(1条)和ACT_GE_BYTEARRAY表(png和bpmn定义)
commandContext.getDeploymentEntityManager().insert(deployment);
if (commandContext.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {//默认开启
//触发deployment entity被创建的事件(默认不执行任何操作，只是日志的输出等)
commandContext.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_CREATED, deployment));
}
// Deployment settings
Map<String, Object> deploymentSettings = new HashMap<String, Object>();
//bpmn2.0检查，默认开启
deploymentSettings.put(DeploymentSettings.IS_BPMN20_XSD_VALIDATION_ENABLED, deploymentBuilder.isBpmn20XsdValidationEnabled());
//process流程定义检查，默认开启
deploymentSettings.put(DeploymentSettings.IS_PROCESS_VALIDATION_ENABLED, deploymentBuilder.isProcessValidationEnabled());
// Actually deploy
//执行真正的部署操作
commandContext.getProcessEngineConfiguration().getDeploymentManager().deploy(deployment, deploymentSettings);
if (deploymentBuilder.getProcessDefinitionsActivationDate() != null) {//流程定义是否有激活日期
scheduleProcessDefinitionActivation(commandContext, deployment);//进行流程定义的挂起或定时激活
}
if (commandContext.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {//默认开启
//触发entity被初始化事件
commandContext.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_INITIALIZED, deployment));
}
return deployment;
}主要工作：
1、创建部署对象 2、设置部署时间 3、 在部署时会检测已部署的相同文件的最后一条记录，如果内容相同，则不会部署，直接返回。 否则： 4、设置为一个新的 5、插入ACT_RE_DEPLOYMENT表(1条)和ACT_GE_BYTEARRAY表(png和bpmn定义)记录 触发deployment entity被创建的事件(默认不执行任何操作，只是日志的输出等) 6、bpmn2.0检查开启、process流程定义检查开启。 7、执行真正的部署 8、检查流程定义是否有激活日期，有则进行流程定义的挂起或定时激活
我们主要看第7步：
commandContext.getProcessEngineConfiguration().getDeploymentManager().deploy(deployment, deploymentSettings);
可以看到该步骤调用了部署管理器DeploymentManager的deploy方法：
代码：
protected List<Deployer> deployers;
public void deploy(DeploymentEntity deployment, Map<String, Object> deploymentSettings) {
for (Deployer deployer : deployers) {
deployer.deploy(deployment, deploymentSettings);
}
}可以看到循环调用了部署器的部署方法，部署器默认有BpmnDeployer\FormDeployer\RulesDeployer,此处我们主要分析BpmnDeployer:
代码如下：//真正的流程部署操作
@Override
public void deploy(DeploymentEntity deployment, Map<String, Object> deploymentSettings) {
log.debug("Processing deployment {}", deployment.getName());
// The ParsedDeployment represents the deployment, the process definitions, and the BPMN
// resource, parse, and model associated with each process definition.
ParsedDeployment parsedDeployment = parsedDeploymentBuilderFactory
.getBuilderForDeploymentAndSettings(deployment, deploymentSettings)
.build();
//校验文件里的多个流程定义不能出现多个同样的key
bpmnDeploymentHelper.verifyProcessDefinitionsDoNotShareKeys(parsedDeployment.getAllProcessDefinitions());
//通过deployment为流程定义赋更多属性（引擎版本、tenantId、deploymentId）
bpmnDeploymentHelper.copyDeploymentValuesToProcessDefinitions(
parsedDeployment.getDeployment(), parsedDeployment.getAllProcessDefinitions());
//为流程定义设置资源名称
bpmnDeploymentHelper.setResourceNamesOnProcessDefinitions(parsedDeployment);
//判断是否需要生成图片
createAndPersistNewDiagramsIfNeeded(parsedDeployment);
//为定义设置图片资源名称
setProcessDefinitionDiagramNames(parsedDeployment);
if (deployment.isNew()) {//新的
//查是否存在老的并放入map返回（new:old）
Map<ProcessDefinitionEntity, ProcessDefinitionEntity> mapOfNewProcessDefinitionToPreviousVersion =
getPreviousVersionsOfProcessDefinitions(parsedDeployment);
//给流程定义初始化流程定义id,设置版本号为1或者（根据是否有旧的版本号+1）
setProcessDefinitionVersionsAndIds(parsedDeployment, mapOfNewProcessDefinitionToPreviousVersion);
//流程定义入库，并给流程定义设置候选人也入库
persistProcessDefinitionsAndAuthorizations(parsedDeployment);
//取消旧的消息、信号、定时启动事件等及删库，且入库新的并绑定对应事件
updateTimersAndEvents(parsedDeployment, mapOfNewProcessDefinitionToPreviousVersion);
dispatchProcessDefinitionEntityInitializedEvent(parsedDeployment);//触发流程定义被初始化事件
} else {
//不是新的，则查出来的旧的，并给当前定义设置相关属性（貌似可用于更新(因为版本号没有增加)）
makeProcessDefinitionsConsistentWithPersistedVersions(parsedDeployment);
}
//缓存操作:流程定义放入全局流程定义缓存map和全局流程定义treeNode缓存map,
//还有一个deployedArtifacts部署记录map(class org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntityImpl:实例list)
cachingAndArtifactsManager.updateCachingAndArtifacts(parsedDeployment);
for (ProcessDefinitionEntity processDefinition : parsedDeployment.getAllProcessDefinitions()) {
BpmnModel bpmnModel = parsedDeployment.getBpmnModelForProcessDefinition(processDefinition);
//更新流程定义中国际化数据
createLocalizationValues(processDefinition.getId(), bpmnModel.getProcessById(processDefinition.getKey()));
}
}可以看出主要执行的操作：
1、进行了bpmn xml的解析和构建并保存在ParsedDeployment对象里：
该类相关数据结构：
protected DeploymentEntity deploymentEntity;
protected List<ProcessDefinitionEntity> processDefinitions;
protected Map<ProcessDefinitionEntity, BpmnParse> mapProcessDefinitionsToParses;
protected Map<ProcessDefinitionEntity, ResourceEntity> mapProcessDefinitionsToResources;
2、校验文件里的多个流程定义不能出现多个同样的key
3、通过deployment为流程定义赋更多属性（引擎版本、tenantId、deploymentId）
4、为流程定义设置资源名称
5、判断是否需要生成图片，不存在则创建diagram（入库ACT_GE_BYTEARRAY）
6、为定义设置图片资源名称
7、isNew是否为创建新的：
是：
7.1 查是否存在老的定义并放入map返回（new:old）
7.2 给流程定义初始化流程定义id,设置版本号为1或者（根据是否有旧的版本号+1）
7.3 流程定义入库，并给流程定义设置候选人也入库（流程定义入库ACT_RE_PROCDEF表；
流程启动候选人组入库ACT_RU_IDENTITYLINK:
getCandidateStarterUsers\getCandidateStarterGroups）
7.4 取消旧的消息、信号、定时启动事件等及删库，且入库新的并绑定对应事件
（ACT_RU_EVENT_SUBSCR，ACT_RU_TIMER_JOB）
7.5 触发流程定义被初始化事件
否：
7.1 不是新的，则查出来的旧的，并给当前定义设置相关属性（貌似可用于更新(因为版本号没有增加)）
8、缓存操作:流程定义放入全局流程定义缓存map和全局流程定义treeNode缓存map,
//还有一个deployedArtifacts部署记录map(class org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntityImpl:实例list)
DeploymentCache<ProcessDefinitionCacheEntry>
ProcessDefinitionInfoCache
Map<Class<?>, List<Object>> deployedArtifacts;
9、更新所有流程定义中的国际化数据
相关说明：
//查找localization下语言为es的下id为id下属性为name
//例如结构{"localization":{"es":{"id1":{"name":"123"}}}} 返回"123"
JsonNode localizationNode = infoNode.path("localization").path(language).path(id).path(propertyName);
上面国际化数据通过查询ACT_PROCDEF_INFO表。首先分析代码：
ParsedDeployment parsedDeployment = parsedDeploymentBuilderFactory .getBuilderForDeploymentAndSettings(deployment, deploymentSettings) .build();
如下：
public class ParsedDeploymentBuilderFactory {
protected BpmnParser bpmnParser;
public BpmnParser getBpmnParser() {
return bpmnParser;
}
public void setBpmnParser(BpmnParser bpmnParser) {
this.bpmnParser = bpmnParser;
}
public ParsedDeploymentBuilder getBuilderForDeployment(DeploymentEntity deployment) {
return getBuilderForDeploymentAndSettings(deployment, null);
}
public ParsedDeploymentBuilder getBuilderForDeploymentAndSettings(DeploymentEntity deployment,
Map<String, Object> deploymentSettings) {
return new ParsedDeploymentBuilder(deployment, bpmnParser, deploymentSettings);
}
}可以看到主要在new ParsedDeploymentBuilder(deployment, bpmnParser, deploymentSettings)该行：
public class ParsedDeploymentBuilder {
private static final Logger log = LoggerFactory.getLogger(ParsedDeploymentBuilder.class);
protected DeploymentEntity deployment;
protected BpmnParser bpmnParser;
protected Map<String, Object> deploymentSettings;
public ParsedDeploymentBuilder(DeploymentEntity deployment,
BpmnParser bpmnParser, Map<String, Object> deploymentSettings) {
this.deployment = deployment;
this.bpmnParser = bpmnParser;
this.deploymentSettings = deploymentSettings;
}
public ParsedDeployment build() {
List<ProcessDefinitionEntity> processDefinitions = new ArrayList<ProcessDefinitionEntity>();
Map<ProcessDefinitionEntity, BpmnParse> processDefinitionsToBpmnParseMap
= new LinkedHashMap<ProcessDefinitionEntity, BpmnParse>();
Map<ProcessDefinitionEntity, ResourceEntity> processDefinitionsToResourceMap
= new LinkedHashMap<ProcessDefinitionEntity, ResourceEntity>();
for (ResourceEntity resource : deployment.getResources().values()) {
if (isBpmnResource(resource.getName())) {//判断资源后缀，支持"bpmn20.xml", "bpmn"
log.debug("Processing BPMN resource {}", resource.getName());
//主要进行bpmnModel的构建转换，bpmn2.0,流程校验,di解析等
BpmnParse parse = createBpmnParseFromResource(resource);
for (ProcessDefinitionEntity processDefinition : parse.getProcessDefinitions()) {
processDefinitions.add(processDefinition);
processDefinitionsToBpmnParseMap.put(processDefinition, parse);
processDefinitionsToResourceMap.put(processDefinition, resource);
}
}
}
return new ParsedDeployment(deployment, processDefinitions,
processDefinitionsToBpmnParseMap, processDefinitionsToResourceMap);
}
protected BpmnParse createBpmnParseFromResource(ResourceEntity resource) {
String resourceName = resource.getName();
ByteArrayInputStream inputStream = new ByteArrayInputStream(resource.getBytes());
//构建BpmnParse 解析器
BpmnParse bpmnParse = bpmnParser.createParse()
.sourceInputStream(inputStream)
.setSourceSystemId(resourceName)
.deployment(deployment)
.name(resourceName);
if (deploymentSettings != null) {
// Schema validation if needed
if (deploymentSettings.containsKey(DeploymentSettings.IS_BPMN20_XSD_VALIDATION_ENABLED)) {//bpmn2.0校验
bpmnParse.setValidateSchema((Boolean) deploymentSettings.get(DeploymentSettings.IS_BPMN20_XSD_VALIDATION_ENABLED));
}
// Process validation if needed
if (deploymentSettings.containsKey(DeploymentSettings.IS_PROCESS_VALIDATION_ENABLED)) {//process流程规范检查
bpmnParse.setValidateProcess((Boolean) deploymentSettings.get(DeploymentSettings.IS_PROCESS_VALIDATION_ENABLED));
}
} else {
// On redeploy, we assume it is validated at the first deploy
bpmnParse.setValidateSchema(false);
bpmnParse.setValidateProcess(false);
}
bpmnParse.execute();//执行解析(初始化行为类)
return bpmnParse;
}
......省略
}看到：
1、在build方法里调用了 BpmnParse parse = createBpmnParseFromResource(resource);
2、在createBpmnParseFromResource方法里通过bpmnParser创建了bpmnParse,在bpmnParse.execute里通过bpmnParserHandlers.parseElement(this, process)进行了元素的行为的初始化
综上：
1、resourceService.deploy->2、deploymentManager.deploy->3、bpmnDeployer.deploy->4、bpmnParse.execute(
execute方法进行xml bpmnModel的转换及bpmnParserHander.parseElement(其实该步骤主要用于每个节点元素行为类的设置)
）
其中bpmnParse和bpmnParserHandler都通过bpmnParser创建和获取。
核心在bpmnParse.execute方法里，可以分析一下execute的代码：
public BpmnParse execute() {
try {
ProcessEngineConfigurationImpl processEngineConfiguration = Context.getProcessEngineConfiguration();
BpmnXMLConverter converter = new BpmnXMLConverter();
boolean enableSafeBpmnXml = false;
String encoding = null;
if (processEngineConfiguration != null) {
enableSafeBpmnXml = processEngineConfiguration.isEnableSafeBpmnXml();
encoding = processEngineConfiguration.getXmlEncoding();
}
if (encoding != null) {
bpmnModel = converter.convertToBpmnModel(streamSource, validateSchema, enableSafeBpmnXml, encoding);
} else {
bpmnModel = converter.convertToBpmnModel(streamSource, validateSchema, enableSafeBpmnXml);
}
// XSD validation goes first, then process/semantic validation
if (validateProcess) {
ProcessValidator processValidator = processEngineConfiguration.getProcessValidator();
if (processValidator == null) {
LOGGER.warn("Process should be validated, but no process validator is configured on the process engine configuration!");
} else {
List<ValidationError> validationErrors = processValidator.validate(bpmnModel);
if (validationErrors != null && !validationErrors.isEmpty()) {
StringBuilder warningBuilder = new StringBuilder();
StringBuilder errorBuilder = new StringBuilder();
for (ValidationError error : validationErrors) {
if (error.isWarning()) {
warningBuilder.append(error.toString());
warningBuilder.append("\n");
} else {
errorBuilder.append(error.toString());
errorBuilder.append("\n");
}
}
// Throw exception if there is any error
if (errorBuilder.length() > 0) {
throw new ActivitiException("Errors while parsing:\n" + errorBuilder.toString());
}
// Write out warnings (if any)
if (warningBuilder.length() > 0) {
LOGGER.warn("Following warnings encountered during process validation: " + warningBuilder.toString());
}
}
}
}
bpmnModel.setSourceSystemId(sourceSystemId);
bpmnModel.setEventSupport(new ActivitiEventSupport());
// Validation successful (or no validation)
// Attach logic to the processes (eg. map ActivityBehaviors to bpmn model elements)
applyParseHandlers();//执行子流程的解析
// Finally, process the diagram interchange info
processDI();
} catch (Exception e) {
if (e instanceof ActivitiException) {
throw (ActivitiException) e;
} else if (e instanceof XMLException) {
throw (XMLException) e;
} else {
throw new ActivitiException("Error parsing XML", e);
}
}
return this;
}
protected void applyParseHandlers() {
sequenceFlows = new HashMap<String, SequenceFlow>();
for (Process process : bpmnModel.getProcesses()) {
currentProcess = process;
if (process.isExecutable()) {
bpmnParserHandlers.parseElement(this, process);//在此步骤的解析操作中会把流程定义实体加入processDefinitions集合
}
}
}可以看出调用了bpmnModel = converter.convertToBpmnModel(streamSource, validateSchema, enableSafeBpmnXml);通过BpmnXMLConverter进行了解析并转换为bpmnModel实体。
待补充....