扩展Activiti 5.12轻松搞定流程实例跟随流程版本一起升级

扩展Activiti 5.12轻松搞定流程实例跟随流程版本一起升级，本文详细介绍之
本功能依托于bboss 3.6.2分支和Activiti 5.12.0版本。

为activiti组件org.activiti.engine.repository.DeploymentBuilder增加以下接口方法：
Deployment deploy(int deploypolicy);
参数deploypolicy为int类型，用来指定流程部署策略，有三个值：
DeploymentBuilder.Deploy_policy_default
DeploymentBuilder.Deploy_policy_upgrade
DeploymentBuilder.Deploy_policy_delete
这三个值作为常量定义在部署接口org.activiti.engine.repository.DeploymentBuilder中。他们的含义分别为：
DeploymentBuilder.Deploy_policy_default 没有执行完毕的旧版本实例任务仍然根据旧版本流程定义运行
DeploymentBuilder.Deploy_policy_upgrade 没有执行完毕的旧版本实例任务迁移到新版本流程定义运行
DeploymentBuilder.Deploy_policy_delete 直接取消没有执行完毕的旧版本实例任务

原来的部署接口方法任然保留：
Deployment deploy();

以下是两个简单的使用扩展接口部署流程示例：

public Deployment deployProcDefByZip(String deploymentName,
			ZipInputStream processDef,int upgradepolicy) {
		DeploymentBuilder deploymentBuilder = processEngine
				.getRepositoryService().createDeployment().name(deploymentName);
		deploymentBuilder.addZipInputStream(processDef);		
		/**
		 * 参数upgradepolicy可以为以下常量值：
		 *  DeploymentBuilder.Deploy_policy_default 
	 	 *	DeploymentBuilder.Deploy_policy_upgrade 
	     *  DeploymentBuilder.Deploy_policy_delete 
	     *
		 */			
		return deploymentBuilder.deploy(upgradepolicy);
	}

public Deployment deployProcDefByPath(String deploymentName,
			String xmlPath, String jpgPath,int deploypolicy) {
		Deployment deploy = null;
		/**
		 * 参数deploypolicy可以为以下常量值：
		 *  DeploymentBuilder.Deploy_policy_default 
	 	 *	DeploymentBuilder.Deploy_policy_upgrade 
	     *  DeploymentBuilder.Deploy_policy_delete 
	     *
		 */
		if(jpgPath != null && !jpgPath.equals(""))
		{
			deploy = repositoryService.createDeployment()
					.name(deploymentName).addClasspathResource(xmlPath)
			.addClasspathResource(jpgPath).deploy(deploypolicy);
		}
		else
		{
			deploy = repositoryService.createDeployment()
				.name(deploymentName).addClasspathResource(xmlPath).deploy(deploypolicy);
		}

		return deploy;
	}