activiti--部署bpmn/bar文件详解

Everything that is related to 'static' data (such as process definitions) are accessed through the RepositoryService. Conceptually, every such static piece of data is content of the 'repository' of the Activiti engine.

当配置好工作流，启动工作流。我们的第一步就是配置bpmn、bar、bpmn20.xml等文件。

部署bpmn的简单代码：

ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();
RepositoryService repositoryService = processEngine.getRepositoryService();
repositoryService.createDeployment()
  .addClasspathResource("org/activiti/test/AssigneeUserAndGroup.bpmn")
  .deploy();

简单解释：创建一个部署引擎DeploymentBuilder，然后通过addClasspathResource把文件路径设置进去（最起码activiti需要知道部署哪一个文件啊），然后启动部署方法deploy（）。

addClasspathResource（）方法其实就是把文件读入到一个输入流中，然后调用addInputStream（）方法。addInputStream（）主要是创建一个资源类，然后设置名称，字节，并且把这个资源给deployment实体

public DeploymentBuilder addInputStream(String resourceName, InputStream inputStream) {
    if (inputStream==null) {
      throw new ActivitiIllegalArgumentException("inputStream for resource '"+resourceName+"' is null");
    }
    byte[] bytes = IoUtil.readInputStream(inputStream, resourceName);
    ResourceEntity resource = new ResourceEntity();
    resource.setName(resourceName);
    resource.setBytes(bytes);
    deployment.addResource(resource);
    return this;
  }

  public DeploymentBuilder addClasspathResource(String resource) {
    InputStream inputStream = ReflectUtil.getResourceAsStream(resource);
    if (inputStream==null) {
      throw new ActivitiIllegalArgumentException("resource '"+resource+"' not found");
    }
    return addInputStream(resource, inputStream);
  }

注意：单独部署一个bpmn文件，png会在底层BpmnDeployer中分解出来，并且保存到数据库中。

如果一个部署中涉及到多个文件，我们可以打包一起部署，例如方法addZipInputStream(ZipInputStream zipInputStream)，其实addZipInputStream会把这个包下面的所有文件逐一找出来，然后创建资源类，设置到deployment实体中。

public DeploymentBuilder addZipInputStream(ZipInputStream zipInputStream) {
    try {
      ZipEntry entry = zipInputStream.getNextEntry();
      while (entry != null) {
        if (!entry.isDirectory()) {
          String entryName = entry.getName();
          byte[] bytes = IoUtil.readInputStream(zipInputStream, entryName);
          ResourceEntity resource = new ResourceEntity();
          resource.setName(entryName);
          resource.setBytes(bytes);
          deployment.addResource(resource);
        }
        entry = zipInputStream.getNextEntry();
      }
    } catch (Exception e) {
      throw new ActivitiException("problem reading zip input stream", e);
    }
    return this;
  }

（1）把文件都拷到同一目录下面

（2）对diagrams文件夹进行打包

diagrams.zip

(3)修改文件的扩展名diagrams.bar

 其实一切很简单...