概述
jBPM 6 提供 Rest API 供第三方应用整合使用 jBPM 6，本文演示假设通过 Rest API：
- 启动流程
- 获取流程实例信息
- 启动 User Task
- 完毕 User Task
本文所使用的流程例如以下
如上流程仅仅有一个 User Task 节点，User Task 运行開始和运行结束都输出相关提示。流程 ID为 org.brms.test，节点名字为 Test。运行节点须要的 userID 为 kylin。角色为 IT。
为方便观察，我们须要 jBPM 6 使用 Mysql 替换默认的 H2 数据库。
启动流程
启动流程 Rest API 例如以下：
/runtime/{id: [a-zA-Z0-9-:\.]+}")/process/{id: [a-zA-Z0-9-:\.]+}/start运行 RestEasyClientProcessStart.java 启动流程。启动流程后我们到数据库中查看：
mysql> select id, duration, start_date, end_date, processId, processInstanceId, processName, status from ProcessInstanceLog; +----+----------+---------------------+---------------------+---------------+-------------------+-------------+--------+ | id | duration | start_date | end_date | processId | processInstanceId | processName | status | +----+----------+---------------------+---------------------+---------------+-------------------+-------------+--------+ | 1 | 51569 | 2014-05-10 21:17:20 | 2014-05-10 21:18:11 | org.brms.test | 1 | test | 2 | | 2 | 3770025 | 2014-05-10 21:24:57 | 2014-05-10 22:27:47 | org.brms.test | 2 | test | 2 | | 3 | 4060507 | 2014-05-10 21:25:33 | 2014-05-10 22:33:13 | org.brms.test | 3 | test | 2 | | 4 | 2620216 | 2014-05-10 21:49:41 | 2014-05-10 22:33:21 | org.brms.test | 4 | test | 2 | | 5 | 2561315 | 2014-05-10 21:50:49 | 2014-05-10 22:33:30 | org.brms.test | 5 | test | 2 | | 6 | 2557182 | 2014-05-10 21:51:01 | 2014-05-10 22:33:38 | org.brms.test | 6 | test | 2 | | 7 | 2558504 | 2014-05-10 21:51:07 | 2014-05-10 22:33:45 | org.brms.test | 7 | test | 2 | | 8 | NULL | 2014-05-11 13:21:05 | NULL | org.brms.test | 1 | test | 1 | +----+----------+---------------------+---------------------+---------------+-------------------+-------------+--------+
如上ProcessInstanceLog表中 ID 为 8 的；流程演示样例为我们通过 Rest API 启动的流程实例。注意，status列为1表示流程未被运行。
获取流程实例
获取流程实例 Rest API 例如以下：
/runtime/{id: [a-zA-Z0-9-:\.]+}")/process/instance/{id: [0-9]+}运行 RestEasyClientGetProcessInstance.java 获取流程实例 ，我们运行结果会有例如以下输出
ProcessInstance 1 [processId=org.brms.test,state=1]
注意，我们測试流程的ID 为 org.brms.test，数据库中 processInstanceId 为 1，所以我们的 Rest Path例如以下：
http://localhost:8080/business-central/rest/runtime/org.kie.example:project1:1.0.0-SNAPSHOT/process/instance/1
開始 User Task
開始 User Task Rest API 例如以下：
/task/execute{id: \d+}/start运行 RestEasyClientTaskStart.java 開始运行 User Task ，開始运行之前我们首先到数据库中看当前 User Task 的信息：
mysql> select id, createdOn, deploymentId, processInstanceId, processId, status, createdBy_id from Task; +----+---------------------+-----------------------------------------+-------------------+---------------+----------+--------------+ | id | createdOn | deploymentId | processInstanceId | processId | status | createdBy_id | +----+---------------------+-----------------------------------------+-------------------+---------------+----------+--------------+ | 1 | 2014-05-11 13:21:05 | org.kie.example:project1:1.0.0-SNAPSHOT | 1 | org.brms.test | Reserved | kylin | +----+---------------------+-----------------------------------------+-------------------+---------------+----------+--------------+
注意。此 Task 与 processInstanceId 为 1 的流程演示样例关联，当前状态没有開始。
运行 RestEasyClientTaskStart.java 開始运行 User Task ，运行之后我们相同到数据库查看当前 User Task 的信息：
mysql> select id, createdOn, deploymentId, processInstanceId, processId, status, createdBy_id from Task; +----+---------------------+-----------------------------------------+-------------------+---------------+------------+--------------+ | id | createdOn | deploymentId | processInstanceId | processId | status | createdBy_id | +----+---------------------+-----------------------------------------+-------------------+---------------+------------+--------------+ | 1 | 2014-05-11 13:21:05 | org.kie.example:project1:1.0.0-SNAPSHOT | 1 | org.brms.test | InProgress | kylin | +----+---------------------+-----------------------------------------+-------------------+---------------+------------+--------------+
主要当前 Task 的状态改变为 InProgress。
完毕User Task
完毕User Task Rest API 例如以下：
/task/execute{id: \d+}/complete运行 RestEasyClientTaskComplete.java 能够完毕 User Task ，运行完毕后去数据库查看当前 User Task 的信息：
mysql> select id, createdOn, deploymentId, processInstanceId, processId, status, createdBy_id from Task; Empty set (0.00 sec)
如上数据库中没有Task信息。即jBPM 中当某一 Task 运行完毕后会将其的信息删除。假设我们接着去查看流程实例的信息：
mysql> select id, duration, start_date, end_date, processId, processInstanceId, processName, status from ProcessInstanceLog; +----+----------+---------------------+---------------------+---------------+-------------------+-------------+--------+ | id | duration | start_date | end_date | processId | processInstanceId | processName | status | +----+----------+---------------------+---------------------+---------------+-------------------+-------------+--------+ | 1 | 51569 | 2014-05-10 21:17:20 | 2014-05-10 21:18:11 | org.brms.test | 1 | test | 2 | | 2 | 3770025 | 2014-05-10 21:24:57 | 2014-05-10 22:27:47 | org.brms.test | 2 | test | 2 | | 3 | 4060507 | 2014-05-10 21:25:33 | 2014-05-10 22:33:13 | org.brms.test | 3 | test | 2 | | 4 | 2620216 | 2014-05-10 21:49:41 | 2014-05-10 22:33:21 | org.brms.test | 4 | test | 2 | | 5 | 2561315 | 2014-05-10 21:50:49 | 2014-05-10 22:33:30 | org.brms.test | 5 | test | 2 | | 6 | 2557182 | 2014-05-10 21:51:01 | 2014-05-10 22:33:38 | org.brms.test | 6 | test | 2 | | 7 | 2558504 | 2014-05-10 21:51:07 | 2014-05-10 22:33:45 | org.brms.test | 7 | test | 2 | | 8 | 1069981 | 2014-05-11 13:21:05 | 2014-05-11 13:38:54 | org.brms.test | 1 | test | 2 | +----+----------+---------------------+---------------------+---------------+-------------------+-------------+--------+
我们能够发现 ID 为 8，processInstanceId 为 1的流程 status栏变为 2，这表明流程已经运行完毕，我们也能够发现流程開始时间为 2014-05-11 13:21:05，结束时间为 2014-05-11 13:38:54，运行的周期（duration）为 1069981 毫秒。