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Sometimes you do not want to run a task when a certain condition is met.
In this case you can use the complete expression keyword.
This has a similar syntax to the trigger keyword but sets a task
complete rather than running it.
Completes are used to declare dependencies between two tasks.
For instance, complete t2:b might indicate that a specific
event has not occurred so we do not need to run task t4.
When ecflow_server tries to start a task, it evaluates the trigger
and complete expression s. If the complete expression condition is correct,
the task will set itself complete.

complete expression evaluation takes precedence over the trigger.

Completes can be between tasks, between families, or both.

It can be used in conjunction with a trigger. For example:

Text

# Definition of the suite test.
suite test
   edit ECF_INCLUDE "$HOME/course"   # replace '$HOME' with the path to your home directory
   edit ECF_HOME    "$HOME/course"
   family f1
     edit SLEEP 20
     task t1
     task t2
         trigger t1 eq complete
         event a
         event b
     task t3
         trigger t2:a
     task t4
         trigger t2 eq complete
         complete t2:b
   endfamily
endsuite

Python

#!/usr/bin/env python2.7
import os
import ecflow 

def create_family_f1():
    f1 = ecflow.Family("f1")
    f1.add_variable("SLEEP", 20)
    f1.add_task("t1")
    t2 = f1.add_task("t2")  
    t2.add_trigger("t1 eq complete") 
    t2.add_event("a")
    t2.add_event("b")
    f1.add_task("t3").add_trigger("t2:a")  
    t4 = f1.add_task("t4")
    t4.add_trigger("t2 eq complete")  
    t4.add_complete("t2:b")  
    return f1
      
print "Creating suite definition"   
defs = ecflow.Defs()
suite = defs.add_suite("test")
suite.add_variable("ECF_INCLUDE", os.getenv("HOME") + "/course")
suite.add_variable("ECF_HOME",    os.getenv("HOME") + "/course")

suite.add_family( create_family_f1() )

print "Checking job creation: .ecf -> .job0"   
print defs.check_job_creation()

print "Saving definition to file 'test.def'"
defs.save_as_defs("test.def")

What to do:

  1. Edit the suite definition file or python to add a complete to task t4
  2. Load the definition again
  3. Observe the tasks in ecflowview
  4. See the triggers by selecting t4 and clicking on the triggers icon
  5. See the trigger relation by clicking on the arrow
  6. See the triggers in the tree, using the Show menu
  7. Note the icon indicating that the task has not run
  8. You can modify task t2 to check that task t4 will run when the event is not set
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