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159 | # -*- coding: utf-8 -*-
import simpy
import numpy
# 物件處理服務紀錄
historyService = {}
# 服務站/機具數量/服務時間長度
class ServiceStation(object):
def __init__(self, env, num_machines, service_time):
self.env = env
self.machine = simpy.Resource(env, num_machines)
self.service_time = service_time
def __process__(self, weight):
return weight * self.service_time
def service(self, nameItem):
# 該物件處理服務紀錄
record = historyService[nameItem]
# 機具處理時間
yield self.env.timeout(self.__process__(record['weight']))
# 隨機產生處理結果
record['result'] = numpy.random.randint(50, 99)
# 模擬處理物件
class SimItems:
def __init__(self, env, params):
self.env = env
self.params = params
# 物件請求機具處理
def ProcessItem(self, nameItem, serviceStation):
# 該物件處理服務紀錄
record = historyService[nameItem]
# 物件到達時間
record['arrival'] = self.env.now
# 物件請求機具資源成功
with serviceStation.machine.request() as request:
yield request
# 物件開始處理時間
record['start'] = self.env.now
# 觸發機具服務
yield env.process(serviceStation.service(nameItem))
# 物件處理結束時間
record['end'] = self.env.now
def __NewItem__(self, nameItem):
if nameItem not in historyService:
historyService[nameItem] = {
'weight': numpy.random.randint(5) + 1,
'arrival': 0.0,
'start': 0.0,
'end': 0.0,
'result': 0
}
def Setup(self):
# 備妥機具
serviceStation = ServiceStation(
self.env, self.params['NUM_MACHINES'], self.params['PROCESS_TIME'])
# 期初待處理物件
id_Item = 0
for id_Item in range(0, self.params['NUM_INITIAL_ITEMS']):
name_Item = '%03d' % (id_Item)
self.__NewItem__(name_Item)
# 觸發機具處理新物件
env.process(self.ProcessItem(name_Item, serviceStation))
while True:
# 物件等候處理所需之間隔時間
yield env.timeout(
numpy.random.randint(
self.params['NEW_ITEM_INTERVAL'] - 2,
self.params['NEW_ITEM_INTERVAL'] + 2))
# 待處理之新物件
id_Item += 1
name_Item = '%03d' % id_Item
self.__NewItem__(name_Item)
# 觸發機具處理新物件
env.process(self.ProcessItem(name_Item, serviceStation))
def ShowHistory(self):
# 列舉所有處理物件
for name_item in sorted(historyService.keys()):
# 該物件處理服務紀錄
record = historyService[name_item]
print u'物件-%s\t權重=%2d' % (name_item, record['weight']),
print u'\t到達=%4.0f\t開始=%4.0f' % (
record['arrival'], record['start']
),
if record['result'] == 0:
print u'\t服務終了'
else:
print u'\t結束=%4.0f\t已處理=%3d%%' % (
record['end'], record['result'])
def ShowCSV(self):
print "Item,Weight,Arrival,Start,End,Result"
# 列舉所有處理物件
for name_item in sorted(historyService.keys()):
# 該物件處理服務紀錄
record = historyService[name_item]
print u'物件-%s,%d,' % (name_item, record['weight']),
print u'%.0f,%.0f,' % (
record['arrival'], record['start']
),
print u'%.0f,%.2f' % (
record['end'], record['result']*0.01)
# 主程式
if __name__ == '__main__':
# 重設亂數因子
numpy.random.seed(numpy.random.randint(50) + 1)
# 設置模擬程序參數
params = {
'NUM_INITIAL_ITEMS': numpy.random.randint(8) + 1,
'NUM_MACHINES': numpy.random.randint(4) + 1,
'PROCESS_TIME': numpy.random.randint(10) + 1,
'NEW_ITEM_INTERVAL': numpy.random.randint(10) + 4,
'SIMULATION_TIME': 500
}
# 模擬環境
env = simpy.Environment()
# 模擬程序物件
simItems = SimItems(env, params)
# 設置模擬程序
env.process(simItems.Setup())
# 啟動模擬
env.run(until=params['SIMULATION_TIME'])
# 輸出模擬結果
simItems.ShowHistory() |