{
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  {
   "cell_type": "code",
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   "metadata": {},
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   "source": [
    "import collections\n",
    "import random\n",
    "\n",
    "import simpy\n",
    "import numpy as np"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "RANDOM_SEED = 42\n",
    "TICKETS = 50  # Number of tickets per movie\n",
    "SIM_TIME = 120  # Simulate until"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Movie renege\n",
      "Movie \"Python Unchained\" sold out 38.0 minutes after ticket counter opening.\n",
      "  Number of people leaving queue when film sold out: 16\n",
      "Movie \"Kill Process\" sold out 43.0 minutes after ticket counter opening.\n",
      "  Number of people leaving queue when film sold out: 5\n",
      "Movie \"Pulp Implementation\" sold out 28.0 minutes after ticket counter opening.\n",
      "  Number of people leaving queue when film sold out: 5\n"
     ]
    }
   ],
   "source": [
    "def moviegoer(env, movie, num_tickets, theater):\n",
    "    with theater.counter.request() as my_turn:\n",
    "        # Wait until its our turn or until the movie is sold out\n",
    "        result = yield my_turn | theater.sold_out[movie] # or 조건\n",
    "\n",
    "        # Check if it's our turn of if movie is sold out\n",
    "        if my_turn not in result:\n",
    "            theater.num_renegers[movie] += 1\n",
    "            env.exit()\n",
    "\n",
    "        # Check if enough tickets left.\n",
    "        if theater.available[movie] < num_tickets:\n",
    "            # Moviegoer leaves after some discussion\n",
    "            yield env.timeout(0.5)\n",
    "            env.exit()\n",
    "\n",
    "        # Buy tickets\n",
    "        theater.available[movie] -= num_tickets\n",
    "        if theater.available[movie] < 2:\n",
    "            # Trigger the \"sold out\" event for the movie\n",
    "            theater.sold_out[movie].succeed()\n",
    "            theater.when_sold_out[movie] = env.now\n",
    "            theater.available[movie] = 0\n",
    "        yield env.timeout(1)\n",
    "\n",
    "\n",
    "def customer_arrivals(env, theater):\n",
    "    \"\"\"Create new *moviegoers* until the sim time reaches 120.\"\"\"\n",
    "    while True:\n",
    "        yield env.timeout(random.expovariate(1 / 0.5))\n",
    "\n",
    "        movie = random.choice(theater.movies)\n",
    "        num_tickets = random.randint(1, 6)\n",
    "        if theater.available[movie]:\n",
    "            env.process(moviegoer(env, movie, num_tickets, theater))\n",
    "\n",
    "\n",
    "Theater = collections.namedtuple('Theater', 'counter, movies, available, '\n",
    "                                            'sold_out, when_sold_out, '\n",
    "                                            'num_renegers')\n",
    "\n",
    "\n",
    "# Setup and start the simulation\n",
    "print('Movie renege')\n",
    "random.seed(RANDOM_SEED)\n",
    "env = simpy.Environment()\n",
    "\n",
    "# Create movie theater\n",
    "counter = simpy.Resource(env, capacity=1)\n",
    "movies = ['Python Unchained', 'Kill Process', 'Pulp Implementation']\n",
    "available = {movie: TICKETS for movie in movies}\n",
    "sold_out = {movie: env.event() for movie in movies}\n",
    "when_sold_out = {movie: None for movie in movies}\n",
    "num_renegers = {movie: 0 for movie in movies}\n",
    "theater = Theater(counter, movies, available, sold_out, when_sold_out,\n",
    "                  num_renegers)\n",
    "\n",
    "# Start process and run\n",
    "env.process(customer_arrivals(env, theater))\n",
    "env.run(until=SIM_TIME)\n",
    "\n",
    "# Analysis/results\n",
    "for movie in movies:\n",
    "    if theater.sold_out[movie]:\n",
    "        print('Movie \"%s\" sold out %.1f minutes after ticket counter '\n",
    "              'opening.' % (movie, theater.when_sold_out[movie]))\n",
    "        print('  Number of people leaving queue when film sold out: %s' %\n",
    "              theater.num_renegers[movie])"
   ]
  },
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   "execution_count": null,
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