finished exercise 5, moved files in exercise 3

exercises/inputs/5_author_firetask/parameters.json

 {
+  "number to apply": 10,
   "number to invite": 4,
   "number to fill": 2,
   "minimum score": 2,

exercises/inputs/5_author_firetask/parameters.yaml

@@ -15,5 +15,6 @@ job description:
   work description: work in fictitious projects
 maximum applications: 50
 minimum score: 2
+number to apply: 10
 number to fill: 2
 number to invite: 4

exercises/problems/5_author_firetask/dataloader+repeater.json

+{
+  "fws": [
+    {
+      "fw_id": 1,
+      "name": "Post the job",
+      "spec": {
+        "_tasks": [
+          {
+            "_fw_name": "{{custom_tasks.DataLoaderTask}}",
+            "filename": "job_description.json",
+            "outputs": "job description"
+          },
+          {
+            "_fw_name": "{{custom_tasks.DataLoaderTask}}",
+            "filename": "appl_template.json",
+            "outputs": "application template"
+          }
+        ]
+      }
+    },
+    {
+      "fw_id": 2,
+      "name": "Candidates apply",
+      "spec": {
+        "_tasks": [
+          {
+            "_fw_name": "PythonFunctionTask",
+            "function": "recruiting.candidates_apply",
+            "inputs": ["application template", "maximum applications"],
+            "outputs": ["applicant profiles"]
+          },
+          {
+            "_fw_name": "{{custom_tasks.RepeatIfLengthLesser}}",
+            "measure": "applicant profiles",
+            "minimum": "number to apply"
+          }
+        ],
+        "maximum applications": 30,
+        "number to apply": 10
+      }
+    },
+    {
+      "fw_id": 3,
+      "name": "Screen candidates",
+      "spec": {
+        "_tasks": [
+          {
+            "_fw_name": "PythonFunctionTask",
+            "function": "recruiting.screen_candidates",
+            "inputs": [
+                "job description",
+                "applicant profiles",
+                "minimum score",
+                "number to invite"
+            ],
+            "outputs": ["invited applicants"]
+          },
+          {
+            "_fw_name": "{{custom_tasks.RepeatIfLengthLesser}}",
+            "measure": "invited applicants",
+            "minimum": "number to invite"
+          }
+        ],
+        "number to invite": 4,
+        "minimum score": 2
+      }
+    },
+    {
+      "fw_id": 4,
+      "name": "Interview candidates",
+      "spec": {
+        "_tasks": [
+          {
+            "_fw_name": "PythonFunctionTask",
+            "function": "recruiting.interview_candidates",
+            "inputs": [
+                "job description",
+                "invited applicants",
+                "number to fill"
+            ],
+            "outputs": ["selected applicants"]
+          }
+        ],
+        "number to fill": 2
+      }
+    }
+  ],
+  "links": {
+    "1": [
+      2,
+      3,
+      4
+    ],
+    "2": [
+      3
+    ],
+    "3": [
+      4
+    ]
+  },
+  "metadata": {},
+  "name": "Recruitment workflow"
+}

exercises/problems/5_author_firetask/parameters.json

 {
+  "number to apply": 10,
   "number to invite": 4,
   "number to fill": 2,
   "minimum score": 2,

exercises/problems/5_author_firetask/recruiting-script.py

@@ -10,12 +10,14 @@ number_to_invite = parameters['number to invite']
 max_to_apply = parameters['maximum applications']
 min_score = parameters['minimum score']
 number_to_fill = parameters['number to fill']
+number_to_apply = parameters['number to apply']
+
+applied = []
+while len(applied) < number_to_apply:
+    applied = candidates_apply(template, max_to_apply)
 
 screened = []
 while len(screened) < number_to_invite:
-    applied = []
-    while len(applied) < number_to_invite:
-        applied = candidates_apply(template, max_to_apply)
     screened = screen_candidates(job, applied, min_score, number_to_invite)
 
 selected = interview_candidates(job, screened, number_to_fill)

exercises/solutions/5_author_firetask/custom_tasks.py

-from fireworks.core.firework import FiretaskBase, FWAction
+from fireworks.core.firework import FiretaskBase, FWAction, Firework
 from fireworks.utilities.fw_utilities import explicit_serialize
+from fireworks.utilities.fw_serializers import load_object
 
 @explicit_serialize
 class DataLoaderTask(FiretaskBase):
@@ -15,3 +16,21 @@ class DataLoaderTask(FiretaskBase):
             data = json.load(inp)
 
         return FWAction(update_spec={self['outputs']: data})
+
+
+@explicit_serialize
+class RepeatIfLengthLesser(FiretaskBase):
+    """ Sample conditional repeater """
+
+    _fw_name = 'RepeatIfLengthLesser'
+    required_params = ['measure', 'minimum']
+    optional_params = []
+
+    def run_task(self, fw_spec):
+        if len(fw_spec[self['measure']]) < fw_spec[self['minimum']]:
+            firework = Firework(
+                tasks=[load_object(task) for task in fw_spec['_tasks']],
+                spec=fw_spec,
+                name='repeat '+self['measure']
+            )
+            return FWAction(detours=firework)