Bidirectional Loop Workflow

edge-cases

This workflow models circular references between nodes in both directions.

Full FlowZap Code

laneA { # Lanea
  n1: circle label:"Start Bidirectional Loop"
  n2: diamond label:"Bidirectional Loop step 2"
  n5: rectangle label:"Bidirectional Loop step 5"
  n9: rectangle label:"Bidirectional Loop step 9"
  n13: rectangle label:"Bidirectional Loop step 13"
  n1.handle(right) -> n2.handle(left)
  n2.handle(bottom) -> laneC.n3.handle(top) [label="Yes/Approved"]
  n2.handle(bottom) -> laneD.n4.handle(top) [label="No/Rejected"]
  n5.handle(bottom) -> laneB.n6.handle(top)
  n9.handle(bottom) -> laneB.n10.handle(top)
  n13.handle(bottom) -> laneB.n14.handle(top)
  n2.handle(right) -> laneC.n3.handle(left) [label="Forward"]
  loop [retry until success] n2 n5 n9 n13 n6 n10 n14 n3 n7 n11 n15 n4 n8 n12
}

laneB { # Laneb
  n6: rectangle label:"Bidirectional Loop step 6"
  n10: rectangle label:"Bidirectional Loop step 10"
  n14: rectangle label:"Bidirectional Loop step 14"
  n6.handle(bottom) -> laneC.n7.handle(top)
  n10.handle(bottom) -> laneC.n11.handle(top)
  n14.handle(bottom) -> laneC.n15.handle(top)
}

laneC { # Lanec
  n3: rectangle label:"Bidirectional Loop step 3"
  n7: rectangle label:"Bidirectional Loop step 7"
  n11: rectangle label:"Bidirectional Loop step 11"
  n15: rectangle label:"Bidirectional Loop step 15"
  n7.handle(bottom) -> laneD.n8.handle(top)
  n11.handle(bottom) -> laneD.n12.handle(top)
  n15.handle(bottom) -> laneD.n16.handle(top)
  n3.handle(left) -> laneA.n2.handle(right) [label="Back"]
  n3.handle(right) -> laneA.n5.handle(left)
}

laneD { # Laned
  n4: rectangle label:"Bidirectional Loop step 4"
  n8: rectangle label:"Bidirectional Loop step 8"
  n12: rectangle label:"Bidirectional Loop step 12"
  n16: circle label:"End Bidirectional Loop"
  n12.handle(right) -> laneA.n13.handle(left)
  n8.handle(right) -> laneA.n9.handle(left)
  n4.handle(right) -> laneA.n5.handle(left)
}