Smalltalk80LanguageImplementation:Chapter 24 - Revision history

Onionmixer at 16:07, 13 July 2015

2015-07-13T16:07:30Z

← Older revision		Revision as of 16:07, 13 July 2015
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	When a SimulationObject requests a resource (acquire: amount ofResource: resourceName), the currently active simulation (ActiveSimulation) is asked to provide the corresponding resource (provideResourceFor:). Presumably the resource exists in the simulation as a result of the initialization of the Simulation; the Simulation refers to a Set of instances of ResourceProvider and can enumerate this Set in order to find one whose name is resourceName.		When a SimulationObject requests a resource (acquire: amount ofResource: resourceName), the currently active simulation (ActiveSimulation) is asked to provide the corresponding resource (provideResourceFor:). Presumably the resource exists in the simulation as a result of the initialization of the Simulation; the Simulation refers to a Set of instances of ResourceProvider and can enumerate this Set in order to find one whose name is resourceName.


	Once the SimulationObject has access to a ResourceProvider it can		Once the SimulationObject has access to a ResourceProvider it can

	~~<syntaxhighlight lang="smalltalk">~~		:ask how many resources it has available,
	ask how many resources it has available,		:ask its name,
	ask its name,		:ask to acquire some amount (and with a particular access priority),
	ask to acquire some amount (and with a particular access priority),		:ask to produce some amount.
	ask to produce some amount.
	~~</syntaxhighlight>~~


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	The statistics give us the number of buyers, minimum, maximum, and average wait times for the buyers, and the number of buyers within each wait-time interval. No one waited longer than 204 days. 91 car buyers came to the dealer; 12 did not have to wait because the dealer had cars already. Of the 43 that waited and were served, they waited on the average of 78.5 days.		The statistics give us the number of buyers, minimum, maximum, and average wait times for the buyers, and the number of buyers within each wait-time interval. No one waited longer than 204 days. 91 car buyers came to the dealer; 12 did not have to wait because the dealer had cars already. Of the 43 that waited and were served, they waited on the average of 78.5 days.


	At time 360.0 the statistics indicates the following information.		At time 360.0 the statistics indicates the following information.

Onionmixer: 정오표 수정

2014-05-09T09:42:34Z

정오표 수정

← Older revision		Revision as of 09:42, 9 May 2014
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	An example execution of this simulation, in which only exits and ~~extries~~ are monitored, is		An example execution of this simulation, in which only exits and entries are monitored, is

	{\| style="border: 1px solid black;"		{\| style="border: 1px solid black;"
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	\| flag \|		\| flag \|
	(self inquireFor: 2 ofResource: 'jelly beans')		(self inquireFor: 2 ofResource: 'jelly beans')
	ifTrue: [self ~~acQuire~~: 2 ofResource: 'jelly beans'.		ifTrue: [self acquire: 2 ofResource: 'jelly beans'.
	flag ← self inquireFor: 2 ofResource: 'jelly beans'.		flag ← self inquireFor: 2 ofResource: 'jelly beans'.
	"Are there still 2 left so that the next Visitor can be served?"		"Are there still 2 left so that the next Visitor can be served?"
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	\|4.0\|\|third FileSystemReader holds for 5.0		\|4.0\|\|third FileSystemReader holds for 5.0
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|5.0\|\|first ~~FiteSystemWriter~~ requests 3 of File		\|5.0\|\|first FileSystemWriter requests 3 of File
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|5.0\|\|first FileSystemWriter obtained 3 of File		\|5.0\|\|first FileSystemWriter obtained 3 of File
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	\|21.0\|\|first FileSystemWriter requests 3 of File		\|21.0\|\|first FileSystemWriter requests 3 of File
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|21.0\|\|first ~~FiteSystemWriter~~ obtained 3 of File		\|21.0\|\|first FileSystemWriter obtained 3 of File
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|21.0\|\|first FileSystemWriter holds for 3.0		\|21.0\|\|first FileSystemWriter holds for 3.0
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	\|24.0\|\|second FileSystemWriter obtained 3 of File		\|24.0\|\|second FileSystemWriter obtained 3 of File
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|24.0\|\|second ~~FiteSystemWriter~~ holds for 3.0		\|24.0\|\|second FileSystemWriter holds for 3.0
	\|}		\|}

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	exit: aSimulationObject		exit: aSimulationObject
	super exit: aSimulationObject.		super exit: aSimulationObject.
	"A CarDelivery ~~coud~~ be exiting--ignore it"		"A CarDelivery could be exiting--ignore it"
	(aSimulationObject isKindOf: CarBuyer		(aSimulationObject isKindOf: CarBuyer
	ifTrue: [statistics store: currentTime -- aSimulationObject entryTime]		ifTrue: [statistics store: currentTime -- aSimulationObject entryTime]
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	\|420.000\|\|MainlandArrival 1		\|420.000\|\|MainlandArrival 1
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|425.290\|\|~~MainlandArrivai~~ 2		\|425.290\|\|MainlandArrival 2
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|429.380\|\|MainlandArrival 3		\|429.380\|\|MainlandArrival 3
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	\|433.564\|\|Ferry 1 obtained 1 of Island, holds for 0.5\|\|cross over		\|433.564\|\|Ferry 1 obtained 1 of Island, holds for 0.5\|\|cross over
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|434.064\|\|Ferry 1 holds for 8.55344\|\|unload 3 cars at Mainland: there are now 3 cars waiting at Mainland and 3 cars waiting ~~atIsland~~		\|434.064\|\|Ferry 1 holds for 8.55344\|\|unload 3 cars at Mainland: there are now 3 cars waiting at Mainland and 3 cars waiting at Island
	\|- style="vertical-align:top;"		\|- style="vertical-align:top;"
	\|442.617\|\|Ferry 1 holds for 1.5\|\|load at Mainland: there is now 3 cars waiting at Mainland and 0 cars waiting at Island		\|442.617\|\|Ferry 1 holds for 1.5\|\|load at Mainland: there is now 3 cars waiting at Mainland and 0 cars waiting at Island

Onionmixer: SMALLTALK80 Chapter 24 The Use of Resources in Event-Driven Simulations 페이지 추가

2014-04-29T17:10:46Z

SMALLTALK80 Chapter 24 The Use of Resources in Event-Driven Simulations 페이지 추가

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