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Sometimes a task should not be run when a certain condition is met.
The condition can be signalled by an event. For example, event t2:b
might indicate that task t2 did not manage to produce expected result, so
we do not need to run task t4.
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.
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   # task t2 will only start when task t1 is complete
         event a                  # task t2 will set an event a
         event b                  # task t2 will set an event b
     task t3
         trigger t2:a             # task t3 will start when event a is set in task t2
     task t4
         trigger t2 eq complete   # task t4 will start when task t2 is complete
         complete t2:b            # task t4 will complete if event b is set in task t2
   endfamily
endsuite

Python

$HOME/course/test.py
import os
from ecflow import Defs,Suite,Family,Task,Edit,Trigger,Complete,Event

def create_family_f1():
    return Family("f1",
                Edit(SLEEP= 20),
                Task("t1"),
                Task("t2",
                    Trigger("t1 == complete"),
                    Event("a"), 
                    Event("b")),
                Task("t3",
                    Trigger("t2:a")),
                Task("t4",
                    Trigger("t2 == complete"), 
                    Complete("t2:b")))
        
print("Creating suite definition")  
home = os.path.join(os.getenv("HOME"), "course")
defs = Defs( 
        Suite("test",
            Edit(ECF_INCLUDE=home,ECF_HOME=home),
            create_family_f1()))
print(defs) 

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. Update test.def or test.py to add a complete expression to task t4
  2. Replace the suite
    python:  python test.py ; python client.py
    text:       ecflow_client --suspend=/test ;  ecflow_client --replace=/test test.def
  3. Observe the tasks in ecflow_ui
  4. See the triggers by selecting t4
  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. To check the triggers modify task t2 so that event b is not triggered;  task t4 should run when t2 completes.
        
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  1. Alternative styles

    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.path.join(os.getenv("HOME"),  "course"))
    suite.add_variable("ECF_HOME",    os.path.join(os.getenv("HOME"),  "course"))
    
    suite.add_family( create_family_f1() )
    print(defs)
    
    print("Checking job creation: .ecf -> .job0")   
    print(defs.check_job_creation())
    
    print("Checking trigger expressions")
    print(defs.check())
    
    print("Saving definition to file 'test.def'")
    defs.save_as_defs("test.def")
    
    print("Replace suite /test in the server")
    defs.test.replace_on_server()
    import os
    from ecflow import *
    
    home = os.path.join(os.getenv("HOME"), "course")
    def create_family_f1():
       f1 = Family("f1") + Edit(SLEEP=20) 
       f1 += [ Task("t{}".format(i)) for i in range(1,5) ]    
       f1.t2 += [ Trigger(["t1"]), Event("a"), Event("b") ]
       f1.t3 += Trigger("t2:a") 
       f1.t4 += [ Trigger(["t2"]),Complete("t2:b") ]
       return f1
           
    print("Creating suite definition")
    defs = Defs() + (Suite("test") + Edit(ECF_INCLUDE=home,ECF_HOME=home))
    defs.test += create_family_f1()
     
    print(defs)
    print("Checking job creation: .ecf -> .job0")  
    print(defs.check_job_creation())
    print("Saving definition to file 'test.def'")
    defs.save_as_defs("test.def")
    
    print("Replace suite /test in the server")
    defs.test.replace_on_server()