activiti 流程定义和流程实例的挂起

关于流程定义和流程实例的挂起，activiti的官方文档描述比较详细，摘录如下：

Suspending and activating a process

It’s possible to suspend a process definition. When a process definition is suspended,
new process instance can’t be created (an exception will be thrown).
Suspending the process definition is done through the 

RepositoryService

:

code segment

repositoryService.suspendProcessDefinitionByKey("vacationRequest");
try {
runtimeService.startProcessInstanceByKey("vacationRequest");
} catch (ActivitiException e) {
e.printStackTrace();
}

To reactivate a process definition, simply call one of the 

repositoryService.activateProcessDefinitionXXX

 methods.

It’s also possible to suspend a process instance. When suspended, the process cannot be continued (e.g. completing a task throws an exception) and no jobs (such as timers) will executed. Suspending a process instance can be done by calling the

runtimeService.suspendProcessInstance

 method.
Activating the process instance again is done by calling the

runtimeService.activateProcessInstanceXXX

 methods.