uniquely identifying user task form process instances

rhiremat — Thu, 29 May 2014 02:43:03 GMT

Hello fellow activitiers,I have following questions, appreciate your help on these..Question 1 : Is the Business Key unique among all process instances running/completed/suspended, etc?Question 2 : I am making a following query :Execution execution = processEngine.getRuntimeService().createExecution

Re: uniquely identifying user task form process instances

martin_grofcik — Thu, 29 May 2014 06:49:25 GMT

Hi Raj,

Question 1 : Is the Business Key unique among all process instances running/completed/suspended, etc?


 /**
   * Starts a new process instance in the latest version of the process
   * definition with the given key.
   * 
   * A business key can be provided to associate the process instance with a
   * certain identifier that has a clear business meaning. For example in an
   * order process, the business key could be an order id. This business key can
   * then be used to easily look up that process instance , see
   * {@link ProcessInstanceQuery#processInstanceBusinessKey(String)}. Providing
   * such a business key is definitely a best practice.
   * 
   * Note that a business key MUST be unique for the given process definition.
   * Process instance from different process definition are allowed to have the
   * same business key.
   * 
   * The combination of processdefinitionKey-businessKey must be unique.
   * 
   * @param processDefinitionKey
   *          key of process definition, cannot be null.
   * @param businessKey
   *          a key that uniquely identifies the process instance in the context
   *          or the given process definition.
   * @throws ActivitiObjectNotFoundException
   *           when no process definition is deployed with the given key.
   */
  ProcessInstance startProcessInstanceByKey(String processDefinitionKey, String businessKey);

but this behavior has changed in 5.15
http://forums.activiti.org/content/activiti-didnt-check-uniqueness-businesskey

Question 2 : I am making a following query :


  /**
   * Executes the query and returns the resulting entity or null if no
   * entity matches the query criteria.
   * @throws ActivitiException when the query results in more than one
   * entities.
   */
  U singleResult();

Question 3 : Among all running process instances a given user tasks’s ID returned by tasks.getId() would always be the same, is this the current understanding? Does this mean, this is actually a task design db id?

task.getId() - returns unique id of the task. (Unique means only one in the process engine.)


  /** DB id of the task. */
 String getId();

Regards
Martin

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uniquely identifying user task form process instances

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