from ecflow import Defs,Suite,Task,Trigger,Complete

defs = Defs()
s1 = defs.add_suite("s1") 
t1 = s1.add_task("t1")
t2 = s1.add_task("t2")
t2.add_trigger( "t1 == active and t3 == aborted" )
t2.add_complete( "t3 == complete" )
t3 = s1.add_task("t3")

The following examples show alternative styles that produce the same definition:


defs = Defs().add(
         Suite("s1").add(
           Task("t1"),
           Task("t2").add(
              Trigger("t1 == active and t3 == aborted"),
              Complete("t3 == complete")),
           Task("t3")))



defs = Defs() + Suite("s1")
defs.s1 += [ Task("t{}".format(i)) for i in range(1,4) ]
defs.s1.t2 += [ Trigger("t1 == active and t3 == aborted"),
                        Complete("t3 == complete") ]


Adding triggers like '<nodepath> == complete' is extremely common. Hence there are a few short cuts;

task = Task("task")
# Using a trigger with a 'list' argument, each string/node element converted to <name> == complete
t = Trigger(["a","b",task])  # because Task("task") does *NOT* have a parent, we will use the name
assert str(t) == "a == complete AND b == complete AND task == complete","Trigger not as expected: " + str(t))

defs = Defs()
task = defs.add_suite("s").add_family("f").add_task("task")
t = Trigger(["a","b",task])      # Task('task') has a parent hierarchy, hence we use full path in trigger expression
assert str(t) == "a == complete AND b == complete AND /s/f/task == complete", "Trigger not as expected: " + str(t))

Chaining Tasks

There are many times where we want to add a chain of task, i,e where task must be run sequentially one after the other. The following examples show different styles of chaining tasks which are identical:


from ecflow import *
defs = Defs() + Suite("s1")
defs.s1 += [ Task("t1"),Task("t2"),Task("t3"),Task("t4") ]
defs.s1.t2 += Trigger( "t1 == complete" )
defs.s1.t3 += Trigger( "t2 == complete" )
defs.s1.t4 += Trigger( "t3 == complete" )



from ecflow import *
defs.s1 += [ Task("t1"),Task("t2"),Task("t3"),Task("t4") ]
defs.s1.t2 += Trigger( ["t1"] ) 
defs.s1.t3 += Trigger( ["t2"] )
defs.s1.t4 += Trigger( ["t3"] )



from ecflow import *
defs = Defs() + (Suite("s1") + 
       Task("t1") >> Task("t2") >> Task("t3") >> Task("t4"))