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import simpy
def _get_prep_time_and_emit_pace(cafe, config):
barista_queue = len(cafe.baristas.get_queue)
cashier_queues = sum(len(c.queue) for c in cafe.cashiers)
total_waiting = barista_queue + cashier_queues
pace = "Steady"
if total_waiting >= 6:
pace = "Peak"
elif total_waiting == 0:
pace = "Quiet"
cafe.emit("pace_change", "system", {"pace": pace})
prep_mode = (config["prep_min"] + config["prep_max"]) / 2.0
prep_time = random.triangular(config["prep_min"], config["prep_max"], prep_mode)
if pace == "Peak":
prep_time *= 0.75 # 25% reduction Batch Prep
return prep_time
def handle_reservation_flow(env, cafe, name, config, arrival_time):
# VIPs bypass the queue and instantly check-in at the first cashier desk
cafe.emit("vip_checkin", name, {"cashier_index": 0})
yield env.timeout(2.0) # 2 seconds to allow the ticket animation to finish
# Check if their reserved table is still waiting for them!
my_table = next((t for t in cafe.tables if t["status"] == "reserved" and t["reserved_for"] == name), None)
if not my_table:
# Oh no! They missed the window. They take their pre-made drink and leave immediately.
cafe.emit("missed_reservation", name)
cafe.emit("served", name)
yield env.timeout(1.0)
cafe.emit("leave", name)
return
# Claim the table
my_table["status"] = "occupied"
my_table["reserved_for"] = None
cafe.emit("seated_waiting_order", name, {"is_reservation": True, "table_id": my_table["id"]})
# Drink is already made and waiting for them
yield env.timeout(1.0)
cafe.emit("served", name)
yield env.timeout(random.uniform(config["dwell_min"], config["dwell_max"]))
# Leave and free table
my_table["status"] = "available"
if env.now > config.get("warmup_time", 0):
cafe.cycle_times.append(env.now - arrival_time)
cafe.completed_customers += 1
def handle_takeout_flow(env, cafe, name, config, arrival_time):
cafe.emit("waiting_pickup", name)
barista_req = cafe.baristas.get()
print(f"[{env.now:.1f}] {name} handle_takeout_flow requesting barista...")
if cafe.event_queue is None:
barista_idx = yield barista_req
print(f"[{env.now:.1f}] {name} got barista (headless)")
else:
while True:
results = yield barista_req | env.timeout(60.0)
if barista_req in results:
barista_idx = results[barista_req]
print(f"[{env.now:.1f}] {name} got barista {barista_idx}")
break
print(f"[{env.now:.1f}] {name} still waiting for barista...")
cafe.emit("prep_waiting_frustration", name)
print(f"[{env.now:.1f}] {name} getting prep time...")
prep_time = _get_prep_time_and_emit_pace(cafe, config)
print(f"[{env.now:.1f}] {name} emitting start_prep...")
cafe.emit("start_prep", name, {
"barista_index": barista_idx,
"duration": prep_time
})
if cafe.event_queue is None:
yield env.timeout(prep_time)
else:
elapsed = 0.0
while elapsed < prep_time:
chunk = min(60.0, prep_time - elapsed)
yield env.timeout(chunk)
elapsed += chunk
if elapsed < prep_time:
cafe.emit("prep_waiting_frustration", name)
cafe.baristas.put(barista_idx) # Free the barista
cafe.emit("served", name)
cafe.emit("leave", name)
if env.now > config.get("warmup_time", 0):
cafe.cycle_times.append(env.now - arrival_time)
cafe.completed_customers += 1
def handle_dine_in_flow(env, cafe, name, config, arrival_time):
cafe.emit("waiting_table", name, {"is_reservation": False})
drink_ready_event = env.event()
def make_drink():
barista_req = cafe.baristas.get()
print(f"[{env.now:.1f}] {name} make_drink requesting barista...")
if cafe.event_queue is None:
barista_idx = yield barista_req
print(f"[{env.now:.1f}] {name} got barista (headless)")
else:
while True:
results = yield barista_req | env.timeout(60.0)
if barista_req in results:
barista_idx = results[barista_req]
print(f"[{env.now:.1f}] {name} got barista {barista_idx}")
break
print(f"[{env.now:.1f}] {name} still waiting for barista...")
cafe.emit("prep_waiting_frustration", name)
print(f"[{env.now:.1f}] {name} getting prep time...")
prep_time = _get_prep_time_and_emit_pace(cafe, config)
print(f"[{env.now:.1f}] {name} emitting start_prep...")
cafe.emit("start_prep", name, {
"barista_index": barista_idx,
"duration": prep_time
})
if cafe.event_queue is None:
yield env.timeout(prep_time)
else:
elapsed = 0.0
while elapsed < prep_time:
chunk = min(60.0, prep_time - elapsed)
yield env.timeout(chunk)
elapsed += chunk
if elapsed < prep_time:
cafe.emit("prep_waiting_frustration", name)
cafe.baristas.put(barista_idx) # Free the barista
cafe.emit("finish_prep", name) # Tell UI the barista is done
drink_ready_event.succeed()
# Start making the drink concurrently
env.process(make_drink())
# Wait for a table to become available
table = None
while True:
available = [t for t in cafe.tables if t["status"] == "available"]
if available:
table = random.choice(available)
table["status"] = "occupied"
break
yield env.timeout(1.0)
if cafe.event_queue:
# Emit frustration periodically if waiting too long
if random.random() < 0.1:
cafe.emit("prep_waiting_frustration", name)
cafe.emit("seated_waiting_order", name, {"is_reservation": False, "table_id": table["id"]})
# Wait for the barista to actually finish making the drink
yield drink_ready_event
yield env.timeout(2.0) # Time to receive drink
cafe.emit("served", name)
yield env.timeout(random.uniform(config["dwell_min"], config["dwell_max"]))
table["status"] = "available"
cafe.emit("leave", name)
if env.now > config.get("warmup_time", 0):
cafe.cycle_times.append(env.now - arrival_time)
cafe.completed_customers += 1
def customer_process(env, cafe, name, config, force_takeout=False, is_reservation=False):
cafe.emit("arrive", name)
arrival_time = env.now
# Spend a moment walking into the shop
yield env.timeout(random.uniform(1.0, 2.0))
if is_reservation:
yield from handle_reservation_flow(env, cafe, name, config, arrival_time)
return
base_takeout_prob = config.get("takeout_prob", 0.5)
# Check dynamic table capacity to influence takeout prob
available_tables = len([t for t in cafe.tables if t["status"] == "available"])
if available_tables > 0:
effective_takeout_prob = max(0.1, base_takeout_prob * 0.5)
else:
effective_takeout_prob = min(0.95, base_takeout_prob * 1.5)
is_takeout = force_takeout or (random.random() < effective_takeout_prob)
# Find shortest cashier queue
shortest_queue_idx = 0
min_len = cafe.cashiers[0].count + len(cafe.cashiers[0].queue)
for i in range(1, len(cafe.cashiers)):
q_len = cafe.cashiers[i].count + len(cafe.cashiers[i].queue)
if q_len < min_len:
min_len = q_len
shortest_queue_idx = i
# Balking logic
if min_len >= config.get("balk_threshold", 8):
if random.random() < config.get("balk_prob", 0.5):
cafe.emit("balking_start", name)
yield env.timeout(random.uniform(4.0, 8.0))
cafe.emit("balk_leave", name)
if env.now > config.get("warmup_time", 0):
cafe.lost_customers += 1
return
cafe.emit("queue_cashier", name, {"cashier_index": shortest_queue_idx})
target_cashier = cafe.cashiers[shortest_queue_idx]
will_renege = random.random() < config.get("renege_prob", 0.3)
max_strikes = random.randint(1, config.get("max_strikes", 3)) if will_renege else float('inf')
patience_interval = random.uniform(15.0, 30.0)
strikes = 0
with target_cashier.request() as req:
if cafe.event_queue is None:
if will_renege:
total_patience = sum(random.uniform(15.0, 30.0) for _ in range(max_strikes))
results = yield req | env.timeout(total_patience)
if req in results:
wait_time = env.now - arrival_time
if env.now > config.get("warmup_time", 0):
cafe.waiting_times.append(wait_time)
else:
if env.now > config.get("warmup_time", 0):
cafe.lost_customers += 1
return
else:
yield req
wait_time = env.now - arrival_time
if env.now > config.get("warmup_time", 0):
cafe.waiting_times.append(wait_time)
else:
while True:
results = yield req | env.timeout(patience_interval)
if req in results:
wait_time = env.now - arrival_time
if env.now > config.get("warmup_time", 0):
cafe.waiting_times.append(wait_time)
break
position = -1
if req in target_cashier.queue:
position = target_cashier.queue.index(req)
if position >= 0 and position <= 2:
cafe.emit("frustrated_waiting", name)
yield req
break
strikes += 1
if strikes >= max_strikes:
cafe.emit("renege_leave", name, {"cashier_index": shortest_queue_idx})
if env.now > config.get("warmup_time", 0):
cafe.lost_customers += 1
return
else:
cafe.emit("patience_warning", name, {"strike": strikes, "max": max_strikes})
decide_time = random.uniform(config["decide_min"], config["decide_max"])
pay_time = random.uniform(config["pay_min"], config["pay_max"])
total_cashier_time = decide_time + pay_time
cafe.emit("start_deciding", name, {"cashier_index": shortest_queue_idx, "duration": total_cashier_time})
yield env.timeout(decide_time)
cafe.emit("start_paying", name, {"cashier_index": shortest_queue_idx})
yield env.timeout(pay_time)
if is_takeout:
yield from handle_takeout_flow(env, cafe, name, config, arrival_time)
else:
yield from handle_dine_in_flow(env, cafe, name, config, arrival_time)
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