Lynn Trickey's Stacks, Queues and Job Simulation

lib/Queue.rb

@@ -1,22 +1,29 @@
 class Queue
   def initialize
+    @store = Array.new
   end
 
   def enqueue(element)
+    @store << element
   end
 
   def dequeue
+    @store.shift
   end
 
   def front
+    @store.first
   end
 
   def size
+    @store.length
   end
 
   def empty?
+    @store.empty?
   end
 
   def to_s
+    return @store.to_s
   end
 end

lib/Stack.rb

@@ -4,18 +4,23 @@ def initialize
   end
 
   def push(element)
+    @store << element
   end
 
   def pop
+    @store.pop
   end
 
   def top
+    @store.last
   end
 
   def size
+    @store.length
   end
 
   def empty?
+    @store.empty?
   end
 
   def to_s

lib/job-simulation.rb

@@ -1,31 +1,58 @@
-require './Stack.rb'
-require './Queue.rb'
+require_relative 'Stack'
+require_relative 'Queue'
 
 class JobSimulation
-  attr_reader :workers, :waiting, :roll
+  attr_reader :employed, :waiting, :waitlist
 
   def initialize (jobs_available, job_seekers)
+    #job_seekers must be larger than jobs_available
+    @waiting = job_seekers - jobs_available
+    give_jobs(jobs_available)
+    create_wait_list
+  end
 
+  def give_jobs(jobs_available)
+    @number = 1
+    @employed = Stack.new
+    jobs_available.times do
+      @employed.push("Worker \##{@number}")
+      @number += 1
+    end
+    @employed
+  end
+
+  def create_wait_list
+    @waitlist = Queue.new
+    @waiting.times do
+      @waitlist.enqueue("Worker \##{@number}")
+      @number += 1
+    end
+    @waitlist
   end
 
-  def cycle
 
+  def cycle
+    die_roll = rand(1..6)
+    die_roll.times {@waitlist.enqueue(@employed.pop)}
+    die_roll.times {@employed.push(@waitlist.dequeue)}
   end
+
 end
 
 ## Allows us to run our code and see what's happening:
 sim = JobSimulation.new(6,10)
+
 puts "------------------------------"
 puts "Before the simulation starts"
-puts "Employed: #{sim.workers}"
-puts "Waitlist: #{sim.waiting}"
+puts "Employed: #{sim.employed}"
+puts "Waitlist: #{sim.waitlist}"
 puts "------------------------------"
 print "<enter to cycle>\n"
 
 count = 0
 until gets.chomp != ""
   puts "-------Cycle #{count+=1}-------"
   sim.cycle
-  puts "Employed: #{sim.workers}"
-  puts "Waitlist: #{sim.waiting}"
+  puts "Employed: #{sim.employed}"
+  puts "Waitlist: #{sim.waitlist}"
 end

specs/test-queue-implementation.rb

@@ -10,14 +10,14 @@
   end
 
   it "adds something to an empty Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(10)
     q.to_s.must_equal "[10]"
   end
 
   it "adds multiple somethings to a Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(10)
     q.enqueue(20)
@@ -26,14 +26,14 @@
   end
 
   it "starts the size of a Queue at 0" do
-    skip
+    # skip
     q = Queue.new
     q.size.must_equal 0
     q.empty?.must_equal true
   end
 
   it "removes something from the Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(5)
     removed = q.dequeue
@@ -43,7 +43,7 @@
   end
 
   it "removes the right something (LIFO)" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(5)
     q.enqueue(3)
@@ -55,7 +55,7 @@
   end
 
   it "properly adjusts the size with enqueueing and dequeueing" do
-    skip
+    # skip
     q = Queue.new
     q.empty?.must_equal true
     q.enqueue(-1)
@@ -70,7 +70,7 @@
   end
 
   it "returns the front element in the Queue" do
-    skip
+    # skip
     q = Queue.new
     q.enqueue(40)
     q.enqueue(22)

specs/test-stack-implementation.rb

@@ -10,14 +10,12 @@
   end
 
   it "pushes something onto a empty Stack" do
-    skip
     s = Stack.new
     s.push(10)
     s.to_s.must_equal "[10]"
   end
 
   it "pushes multiple somethings onto a Stack" do
-    skip
     s = Stack.new
     s.push(10)
     s.push(20)
@@ -26,14 +24,12 @@
   end
 
   it "starts the size of a Stack at 0" do
-    skip
     s = Stack.new
     s.size.must_equal 0
     s.empty?.must_equal true
   end
 
   it "removes something from the stack" do
-    skip
     s = Stack.new
     s.push(5)
     removed = s.pop
@@ -43,7 +39,6 @@
   end
 
   it "removes the right something (LIFO)" do
-    skip
     s = Stack.new
     s.push(5)
     s.push(3)
@@ -55,7 +50,7 @@
   end
 
   it "properly adjusts the size with pushing and poping" do
-    skip
+    # skip
     s = Stack.new
     s.empty?.must_equal true
     s.push(-1)
@@ -70,7 +65,7 @@
   end
 
   it "returns the top element on the stack" do
-    skip
+    # skip
     s = Stack.new
     s.push(40)
     s.push(22)