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WORKING WITH TASKS Part 2Naveen

17Ap r 2 0 11

TIMER TASK

The Timer task allows us to specify the period of time to wait before the Power

Center Server runs the next task in the workflow. The Timer task has two types of

settings:

Absolute t ime:We specify the exact date and time or we can choose a

user-defined workflow variable to specify the exact time. The next task in

workflow will run as per the date and time specified.

Relative t ime:We instruct the Power Center Server to wait for a specified

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period of time after the Timer task, the parent workflow, or the top-level

workflow s tarts.

Example:Run session s_m_filter_example relative to 1 min after the timer task.

Ste ps for creating workflo w:

1. Workflow -> Create -> Give name wf_timer_task_examp le -> Click ok.

2. Click Tasks - > Create - > Select TIMER from list. Give name

TIMER_Example. Click Create and then do ne.

3. Link TIMER_Example to START task.

4. Right click TIMER_Example-> EDIT -> TIMER tab.

5. Select Relative Time Option and Give 1 min and Select From start time of

this task Option.

6. Apply -> OK.

7. Drag s_m_filter_example and link it to TIMER_Example.

8. Workflow- > Validate and Repos itory -> Save.

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DECISION TASK

The Decision task allows us to enter a condition that determines the

execution of the workflow, similar to a link condition.

The Decision task has a pre-defined variable called

$Decision_task_name.condition that represents the result of the decision

condition.

The Power Center Server evaluates the condition in the Decision task and

sets the pre-defined condition variable to True (1) or False (0 ).

We can specify one decision condition per Decision task.

Example:Com mand Task should run o nly if either s_m_filter_example or

S_M_TOTAL_SAL_EXAMPLE succeeds . If any o f s_m_filter_exampl e o r

S_M_TOTAL_SAL_EXAMPLE fails then S_m_sample_mapping_EMP should run.

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1. Workflow -> Create -> Give name wf_decisio n_task_examp le -> Click ok.

2. Drag s_m_filter_example and S_M_TOTAL_SAL_EXAMPLE to workspace

and link bo th of them to START task.

3. Click Tasks -> Create -> Select DECISION from list. Give name

DECISION_Example . Click Create and then done . Link DECISION_Example

to bo th s_m_ filter_example and S_M_TOTAL_SAL_EXAMPLE.

4. Right click DECISION_Example-> EDIT -> GENERAL tab.5. Set Treat Input Links As to OR. Default is AND. Apply and click OK.

6. Now edit decision task again and go to PROPERTIES Tab. Open the

Expression editor by clicking the VALUE section of Decision Name attribute

and enter the following condition: $S_M_FILTER_EXAMPLE.Status =

SUCCEEDED OR $S_M_TOTAL_SAL_EXAMPLE.Status = SUCCEEDED

7. Validate the condition -> Click Apply -> OK.

8. Drag command task and S_m_sample_mapping_EMP task to workspace

and link them to DECISION_Example task.

9. Double click link between S_m_sample_mapping_EMP &

DECISION_Example & give the condition: $DECISION_Example.Condition= 0. Validate & click OK.

10. Double click link between Command task and DECISION_Example and

give the condition: $DECISION_Example.Condition = 1. Validate and click

OK.

11. Workflow Validate and reposito ry Save.

12. Run wo rkflow and see the result.

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CONTROL TASK

We can use the Control task to stop, abort, or fail the top- level workflow o r

the parent workflow based o n an input link condition.

A pa rent wo rkflow or wo rklet is the wo rkflow or wo rklet that con tains the

Control task.

We give the condition to the link connected to Control Task.

Co nt ro l Opt io n De script io n

Fail Me Fails the contro l task.

Fa il Pa ren t Marks the s ta tus o f the WF o r wo rkl et that conta ins the

Control task as failed.

Stop Parent Stops the WF or worklet that conta ins the Contro l task.

Abo rt Parent Abo rts the WF or wo rklet that conta ins the Contro l task.

Fail Top-Level WF Fails the workflow that is running.

Stop Top-Level WF Stops the workflow that is running.

Abo rt Top-Level WF Abo rts the wo rkflow that is runn ing.

Example: Drag any 3 sessions and if anyone fails, then Abort the top level

workflow.


1. Workflow -> Create -> Give name wf_control _task_exampl e -> Click ok.

2. Drag any 3 sessio ns to wo rkspace and link all of them to START task.

3. Click Tasks - > Create -> Select CONTROL from list. Give name cntr_task.

4. Click Create and then done.

5. Link all sessio ns to the control task cntr_task.

6. Double click link between cntr_task and any s essio n say

s_m_filter_example and give the condition:

$S_M_FILTER_EXAMPLE.Status = SUCCEEDED.

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7. Repeat above step for remaining 2 sessions also .

8. Right click cntr_task-> EDIT -> GENERAL tab. Set Treat Input Links As to

OR. Default is AND.

9. Go to PROPERTIES tab of cntr_task and select the value Fail top level

10. Workflow for Contro l Option. Click Apply and OK.

11. Workflow Validate and reposito ry Save.

12. Run wo rkflow and see the result.

ASSIGNMENT TASK

The Assignment task allows us to assign a value to a user-defined

workflow variable.

See Workflow variable topic to add user defined variables.

To use an Ass ignment task in the workflow, first create and add the

Ass ignm ent task to the workflow. Then configure the As signment task to

assign values or expressio ns to user-defined variables.

We cannot assign values to pre-defined wo rkflow.

Ste ps to create Assignment Task:

1. Open any workflow where we want to use Assignm ent task.

2. Edit Workflow and add user defined variables.

3. Choos e Tasks- Create. Select Assignment Task for the task type.

4. Enter a name for the Assignm ent task. Click Create. Then click Done.

5. Double-click the Assignment task to o pen the Edit Task dialo g box.

6. On the Expressio ns tab, click Add to add an ass ignment.

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7. Click the Open button in the User Defined Variables field.

8. Select the variable for which you want to ass ign a value. Click OK.

9. Click the Edit button in the Expressio n field to o pen the Express ion Editor.

10. Enter the value or expressio n you want to assign.

11. Repeat steps 7-10 to add mo re variable assignments as necessary.

12. Click OK.

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