Some work on making simulation unstoppable.

app/lib/simulator/Simulator.coffee

@@ -10,7 +10,7 @@ module.exports = class Simulator extends CocoClass
     @options ?= {}
     _.extend @, Backbone.Events
     @trigger 'statusUpdate', 'Starting simulation!'
-    @retryDelayInSeconds = 10
+    @retryDelayInSeconds = 2
     @taskURL = '/queue/scoring'
     @simulatedByYou = 0
     @god = new God maxAngels: 1, workerCode: @options.workerCode, headless: true  # Start loading worker.
@@ -85,7 +85,11 @@ module.exports = class Simulator extends CocoClass
 
   processSingleGameResults: (simulationResults) ->
     return console.error "Weird, we destroyed the Simulator before it processed results?" if @destroyed
-    taskResults = @formTaskResultsObject simulationResults
+    try
+      taskResults = @formTaskResultsObject simulationResults
+    catch error
+      console.log "Failed to form task results:", error
+      return @cleanupAndSimulateAnotherTask()
     console.log 'Processing results:', taskResults
     humanSessionRank = taskResults.sessions[0].metrics.rank
     ogreSessionRank = taskResults.sessions[1].metrics.rank
@@ -237,7 +241,11 @@ module.exports = class Simulator extends CocoClass
 
   processResults: (simulationResults) ->
     return console.error "Weird, we destroyed the Simulator before it processed results?" if @destroyed
-    taskResults = @formTaskResultsObject simulationResults
+    try
+      taskResults = @formTaskResultsObject simulationResults
+    catch error
+      console.log "Failed to form task results:", error
+      return @cleanupAndSimulateAnotherTask()
     unless taskResults.taskID
       console.error "*** Error: taskResults has no taskID ***\ntaskResults:", taskResults
       @cleanupAndSimulateAnotherTask()

app/templates/teachers.jade

@@ -48,7 +48,7 @@ block content
             strong Variables
             |  - adds the skill of referencing values that change over time.
 
-      p Students may continue past level 12, depending on their speed and interest, to learn two additional concepts in later levels:
+      p Students may continue past level 20, depending on their speed and interest, to learn two additional concepts in later levels:
         ol
           li
             strong Conditional logic

app/views/ladder/SimulateTabView.coffee

@@ -27,6 +27,8 @@ module.exports = class SimulateTabView extends CocoView
   onLoaded: ->
     super()
     @render()
+    if document.location.hash is '#simulate' and not @simulator
+      @startSimulating()
 
   getRenderData: ->
     ctx = super()
@@ -43,9 +45,18 @@ module.exports = class SimulateTabView extends CocoView
 
   onSimulateButtonClick: (e) ->
     application.tracker?.trackEvent 'Simulate Button Click', {}
+    @startSimulating
+
+  startSimulating: ->
+    @simulationPageRefreshTimeout = _.delay @refreshAndContinueSimulating, 20 * 60 * 1000
+    @simulateNextGame()
     $('#simulate-button').prop 'disabled', true
     $('#simulate-button').text 'Simulating...'
-    @simulateNextGame()
+
+  refreshAndContinueSimulating: =>
+    # We refresh the page every now and again to make sure simulations haven't gotten derailed by bogus games, and that simulators don't hang on to old, stale code or data.
+    document.location.hash = '#simulate'
+    document.location.reload()
 
   simulateNextGame: ->
     unless @simulator
@@ -101,7 +112,7 @@ module.exports = class SimulateTabView extends CocoView
         console.log jqxhr.responseText
 
   destroy: ->
-    clearInterval @refreshInterval
+    clearTimeout @simulationPageRefreshTimeout
     @simulator?.destroy()
     super()