Activiti Model Editor组件
该目录下的editor.html是Activiti Modeler Editor的主界面HTML代码
其中palette区是通过Angular.JS使用stencilsets\bpmn2.0\icons下多个子目录内的PNG图像形成的多组列表。其节点层次关系获取相关代码为:
- stencil-controller.js
- Activiti\modules\activiti-modeler\src\main\java\org\activiti\rest\editor\main\StencilsetRestResource.java
- Activiti\modules\activiti-webapp-explorer2\src\main\resources\stencilset.json
- stencil-controller.js:处理对canvas中BPMN元素的操作,很多处理是通过editor目录下的QRYX库完成的
- toolbar-controller.js:处理对工具栏的操作,很多处理由configuration\toolbar-default-actions.js完成
保存模型操作
保存模型操作,是通过toolbar-default-actions.js中的SaveModel方法完成的,它需要将三部分信息传给服务器:
- 模型的元数据:例如模型名称、分类、创建时间、最后一次更新时间等等
- 模型JSON数据:将canvas内的图像数据转换成JSON数据UTF8字符串
{
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"properties": {
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"name": "",
"documentation": "",
"process_author": "",
"process_version": "",
"process_namespace": "http://www.activiti.org/processdef",
"executionlisteners": "",
"eventlisteners": ""
},
"stencil": {
"id": "BPMNDiagram"
},
"childShapes": [
{
"resourceId": "sid-4F7484B9-11EC-4FCE-8950-FEFFB723D88B",
"properties": {
"overrideid": "",
"name": "",
"documentation": "",
"executionlisteners": "",
"initiator": "",
"formkeydefinition": "",
"formproperties": ""
},
"stencil": {
"id": "StartNoneEvent"
},
"childShapes": [],
"outgoing": [
{
"resourceId": "sid-B589A0D9-FA79-4C12-95B7-253E72480384"
}
],
"bounds": {
"lowerRight": {
"x": 259,
"y": 139
},
"upperLeft": {
"x": 229,
"y": 109
}
},
"dockers": []
},
{
"resourceId": "sid-1A762474-62B9-4F3D-A81C-1ADD46AF7D2F",
"properties": {
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"name": "",
"documentation": "",
"asynchronousdefinition": "false",
"exclusivedefinition": "false",
"executionlisteners": "",
"multiinstance_type": "None",
"multiinstance_cardinality": "",
"multiinstance_collection": "",
"multiinstance_variable": "",
"multiinstance_condition": "",
"isforcompensation": "false",
"usertaskassignment": "",
"formkeydefinition": "",
"duedatedefinition": "",
"prioritydefinition": "",
"formproperties": "",
"tasklisteners": ""
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"stencil": {
"id": "UserTask"
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"childShapes": [],
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"dockers": []
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"properties": {
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"stencil": {
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"childShapes": [],
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"dockers": []
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{
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"properties": {
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"name": "",
"documentation": "",
"conditionsequenceflow": "",
"executionlisteners": "",
"defaultflow": "false"
},
"stencil": {
"id": "SequenceFlow"
},
"childShapes": [],
"outgoing": [
{
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"y": 131.10730365650525
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"dockers": [
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}
},
{
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"properties": {
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"name": "",
"documentation": "",
"conditionsequenceflow": "",
"executionlisteners": "",
"defaultflow": "false"
},
"stencil": {
"id": "SequenceFlow"
},
"childShapes": [],
"outgoing": [
{
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"target": {
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],
"bounds": {
"lowerRight": {
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"y": 1050
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"upperLeft": {
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"y": 0
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},
"stencilset": {
"url": "stencilsets/bpmn2.0/bpmn2.0.json",
"namespace": "http://b3mn.org/stencilset/bpmn2.0#"
},
"ssextensions": []
} - 模型的SVG图像数据:将canvas中的SVG图像数据经过过滤处理而得
服务器侧保存模型的代码位于Activiti\modules\activiti-modeler\src\main\java\org\activiti\rest\editor\model\ModelSaveRestResource.java。
- 通过RepositoryService的saveModel方法将模型的元数据存入数据库的ACT_RE_MODEL表
- 通过RepositoryService的addModelEditorSource方法将模型JSON数据UTF8字符串存入数据库的ACT_GE_BYTEARRAY表
- 通过Apache™ BatikSVGToolkit将模型的SVG图像数据转换成PNG格式,通过RepositoryService的addModelEditorSourceExtra方法将PNG图像存入数据库的ACT_GE_BYTEARRAY表
Activiti Explorer操作已保存模型
对模型的编辑操作是在Activiti Model Editor组件里实现的,对已保存模型的其他操作还是在ActivitiExplorer里基于Vaadin架构实现的。
客户端代码位于:Activiti\modules\activiti-explorer\src\main\java\org\activiti\editor\ui\。
下图的HTML界面由EditorProcessDefinitionDetailPanel.java实现。
显示已保存模型
- 选择模型,会调用EditorProcessDefinitionPage类的showProcessDefinitionDetail方法
- EditorProcessDefinitionDetailPanel类的initUI方法调用initProcessDefinitionInfo方法,它会加入EditorProcessDefinitionInfoComponent实例
- 在构造EditorProcessDefinitionInfoComponent实例时,其initImage方法会被调用,通过RepositoryService的getModelEditorSourceExtra方法获得PNG格式图像,最终被显示到浏览器界面上。
部署已保存模型
EditorProcessDefinitionDetailPanel类的deployModel方法处理部署已保存模型的操作。
- 通过RepositoryService的getModelEditorSource方法获得模型JSON数据的UTF8字符串
- 通过FasterXML/jackson-databind转换成Java对象树
- 通过Activiti\modules\activiti-json-converter\src\main\java\org\activiti\editor\language\json\converter\BpmnJsonConverter.java将模型JSON数据的Java对象树转换成BpmnModel实例
- 通过Activiti\modules\activiti-bpmn-converter\src\main\java\org\activiti\bpmn\converter\BpmnXMLConverter.java将BpmnModel实例转成BPMN XML数据
- 通过RepositoryService的createDeployment方法将BPMN XML数据进行部署
导出已保存模型
EditorProcessDefinitionDetailPanel类的exportModel方法处理导出已保存模型的操作。
- 通过RepositoryService的getModelEditorSource方法获得模型数据的JSON字符串
- 通过FasterXML/jackson-databind转换成Java对象树
- 通过Activiti\modules\activiti-json-converter\src\main\java\org\activiti\editor\language\json\converter\BpmnJsonConverter.java将模型JSON数据的Java对象树转换成BpmnModel实例
- 通过Activiti\modules\activiti-bpmn-converter\src\main\java\org\activiti\bpmn\converter\BpmnXMLConverter.java将BpmnModel实例转成BPMN XML数据
编辑已保存模型
EditorProcessDefinitionDetailPanel类内注册了EditModelClickListener监听器用于处理导入BPMN模型操作。
EditModelClickListener的showModeler会生成访问模型编辑器组件的URL地址,打开指定的模型。
- Activiti\modules\activiti-webapp-explorer2\src\main\webapp\editor-app\app.js中的监听器处理$includeContentLoaded事件,调用了fetchModel方法
- Activiti\modules\activiti-modeler\src\main\java\org\activiti\rest\editor\model\ModelEditorJsonRestResource.java处理该REST请求,返回由RepositoryService的getModel和getModelEditorSource方法获得Activiti模型元数据和JSON数据
导入BPMN模型
EditorProcessDefinitionDetailPanel类内注册了ImportModelClickListener监听器用于处理导入BPMN模型操作。
ImportPopupWindow界面完成BPMN模型操作后,ImportUploadReceiver类的deployUploadedFile方法处理上传的BPMNXML数据。
- 通过Activiti\modules\activiti-bpmn-converter\src\main\java\org\activiti\bpmn\converter\BpmnXMLConverter.java将BPMN XML数据转换成BpmnModel实例
- 通过BpmnModel实例生成模型的元数据,通过RepositoryService的saveModel方法将模型的元数据存入数据库的ACT_RE_MODEL表
- 通过Activiti\modules\activiti-json-converter\src\main\java\org\activiti\editor\language\json\converter\BpmnJsonConverter.java将BpmnModel实例转换成模型JSON数据的Java对象树,通过RepositoryService的addModelEditorSource方法将模型JSON数据UTF8字符串存入数据库的ACT_GE_BYTEARRAY表
一些疑惑和想法:
- 这里BpmnXMLConverter和BpmnJsonConverter用的比较频繁,而且成对出现。为什么不跳过中间的BpmnModel?
- 导入BPMN模型为什么不生成PNG图像?
- 数据库存储的模型数据不采用BPMNXML格式而是采用JSON格式,很灵活,可以随意添加Activiti扩展内容。但是如果没有现成的JSONschema,分析起来够麻烦。