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Activiti源码跟踪之模型Model操作

模型model设计到的表ACT_RE_MODEL、ACT_GE_BYTEARRAY

ACT_RE_MODEL表结构：

CREATE TABLE `ACT_RE_MODEL` (`ID_` varchar(64) COLLATE utf8_bin NOT NULL,`REV_` int(11) DEFAULT NULL,`NAME_` varchar(255) COLLATE utf8_bin DEFAULT NULL,`KEY_` varchar(255) COLLATE utf8_bin DEFAULT NULL,`CATEGORY_` varchar(255) COLLATE utf8_bin DEFAULT NULL,`CREATE_TIME_` timestamp NULL DEFAULT NULL,`LAST_UPDATE_TIME_` timestamp NULL DEFAULT NULL,`VERSION_` int(11) DEFAULT NULL,`META_INFO_` varchar(4000) COLLATE utf8_bin DEFAULT NULL,`DEPLOYMENT_ID_` varchar(64) COLLATE utf8_bin DEFAULT NULL,`EDITOR_SOURCE_VALUE_ID_` varchar(64) COLLATE utf8_bin DEFAULT NULL,`EDITOR_SOURCE_EXTRA_VALUE_ID_` varchar(64) COLLATE utf8_bin DEFAULT NULL,`TENANT_ID_` varchar(255) COLLATE utf8_bin DEFAULT '',PRIMARY KEY (`ID_`),KEY `ACT_FK_MODEL_SOURCE` (`EDITOR_SOURCE_VALUE_ID_`),KEY `ACT_FK_MODEL_SOURCE_EXTRA` (`EDITOR_SOURCE_EXTRA_VALUE_ID_`),KEY `ACT_FK_MODEL_DEPLOYMENT` (`DEPLOYMENT_ID_`),CONSTRAINT `ACT_FK_MODEL_DEPLOYMENT` FOREIGN KEY (`DEPLOYMENT_ID_`) REFERENCES `ACT_RE_DEPLOYMENT` (`ID_`),CONSTRAINT `ACT_FK_MODEL_SOURCE` FOREIGN KEY (`EDITOR_SOURCE_VALUE_ID_`) REFERENCES `ACT_GE_BYTEARRAY` (`ID_`),CONSTRAINT `ACT_FK_MODEL_SOURCE_EXTRA` FOREIGN KEY (`EDITOR_SOURCE_EXTRA_VALUE_ID_`) REFERENCES `ACT_GE_BYTEARRAY` (`ID_`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

其中ACT_RE_MODEL有三个外键，对应ACT_GE_BYTEARRAY的有两个。

CREATE TABLE `ACT_GE_BYTEARRAY`  (`ID_` varchar(64) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,`REV_` int NULL DEFAULT NULL,`NAME_` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,`DEPLOYMENT_ID_` varchar(64) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,`BYTES_` longblob NULL,`GENERATED_` tinyint NULL DEFAULT NULL,PRIMARY KEY (`ID_`) USING BTREE,INDEX `ACT_FK_BYTEARR_DEPL`(`DEPLOYMENT_ID_`) USING BTREE,CONSTRAINT `ACT_FK_BYTEARR_DEPL` FOREIGN KEY (`DEPLOYMENT_ID_`) REFERENCES `ACT_RE_DEPLOYMENT` (`ID_`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_bin ROW_FORMAT = Dynamic;

EDITOR_SOURCE_VALUE_ID_对应ACT_GE_BYTEARRAY的ID_，表示该模型对应的模型文件（json格式数据）。repositoryService.addModelEditorSource方法实现。

EDITOR_SOURCE_EXTRA_VALUE_ID_对应ACT_GE_BYTEARRAY的ID_，表示该模型生成的图片文件。repositoryService.addModelEditorSourceExtra方法实现。

1、保存模型：

Model modelData = repositoryService.newModel();
repositoryService.saveModel(modelData);

执行对应的SaveModelCmd。会插入或更新ACT_RE_MODEL的数据。

SaveModelCmd对应的execute方法：

public Void execute(CommandContext commandContext) {if(model == null) {throw new ActivitiIllegalArgumentException("model is null");}if (model.getId() == null) {commandContext.getModelEntityManager().insertModel(model);} else {commandContext.getModelEntityManager().updateModel(model);}return null;}

执行对应的insert或update方法：
insert方法分发ENTITY_CREATED和ENTITY_INITIALIZED事件：

  public void insertModel(Model model) {((ModelEntity) model).setCreateTime(Context.getProcessEngineConfiguration().getClock().getCurrentTime());((ModelEntity) model).setLastUpdateTime(Context.getProcessEngineConfiguration().getClock().getCurrentTime());getDbSqlSession().insert((PersistentObject) model);if(Context.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_CREATED, model));Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_INITIALIZED, model));}}

update方法分发ENTITY_UPDATED方法：

public void updateModel(ModelEntity updatedModel) {CommandContext commandContext = Context.getCommandContext();updatedModel.setLastUpdateTime(Context.getProcessEngineConfiguration().getClock().getCurrentTime());DbSqlSession dbSqlSession = commandContext.getDbSqlSession();dbSqlSession.update(updatedModel);if(Context.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_UPDATED, updatedModel));}}

2、保存其他信息（模型文件或图片）

保存模型文件（json格式）。涉及到的表：ACT_RE_MODEL、ACT_GE_BYTEARRAY

repositoryService.addModelEditorSource(modelData.getId(), editorNode.toString().getBytes("utf-8"));

AddEditorSourceForModelCmd：

public Object execute(CommandContext commandContext) {commandContext.getModelEntityManager().insertEditorSourceForModel(modelId, bytes);return null;}
}

insertEditorSourceForModel

public void insertEditorSourceForModel(String modelId, byte[] modelSource) {ModelEntity model = findModelById(modelId);if (model != null) {ByteArrayRef ref = new ByteArrayRef(model.getEditorSourceValueId());ref.setValue("source", modelSource);if (model.getEditorSourceValueId() == null) {model.setEditorSourceValueId(ref.getId());updateModel(model);}}}

其中ref.setValue(“source”, modelSource)方法对

model.getEditorSourceValueId() == null 生成DbSqlSession的inser语句，最后执行updateModel方法
model.getEditorSourceValueId() != null ，ByteArrayRef.ensureInitialized()方法调用DbSqlSession.selectById()，ByteArrayEntity存放在canche。ByteArrayRef.setBytes(bytes); 把新的byte值设进 ByteArrayEntity
DbSqlSession.flush()的getUpdatedObjects()方法，比较persistentObject对象，生成update