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*** !!! This page is under construction / valid from Delft-FEWS version 2011.01 !!! ***

Decision Module

<moduleDescriptor id="DecisionModule">
	<description>DecisionModule</description>
	<className>nl.wldelft.fews.system.plugin.decisionmodule.DecisionModule</className>
</moduleDescriptor>

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Please note that at the moment the Decision Module is only available in the development build (2011.01).

Contents

Overview

The Decision Module in Delft-FEWS is used to implement decision logic and evaluation for barriers. With this module we can iteratively evaluate configurated decision rules. The configuration file of the Decision Module contains the definition of one or more Decision Trees. These Decision Trees defined in the Decision Module are associated with a Barrier definition which are defined by the Barriers configuration file.

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	<variable>
		<variableId>SVKW.position.in</variableId>
		<timeSeriesSet>
			<moduleInstanceId>RMM_Structures_Forecast_Processing_Extrapolate</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>State.position.meting</parameterId>
			<locationId>SVKW</locationId>
			<timeSeriesType>simulated forecasting</timeSeriesType>
			<timeStep unit="minute" multiplier="10"/>
			<relativeViewPeriod unit="day" start="0" end="1" endOverrulable="true"/>
			<readWriteMode>add originals</readWriteMode>
		</timeSeriesSet>
	</variable>
	<variable>
		<variableId>SVKW.position.dss</variableId>
		<timeSeriesSet>
			<moduleInstanceId>RMM_DecisionTree</moduleInstanceId>
			<valueType>scalar</valueType>
			<parameterId>State.position.meting</parameterId>
			<locationId>SVKW</locationId>
			<timeSeriesType>simulated forecasting</timeSeriesType>
			<timeStep unit="minute" multiplier="10"/>
			<relativeViewPeriod unit="day" start="0" end="1" endOverrulable="true"/>
			<readWriteMode>add originals</readWriteMode>
		</timeSeriesSet>
	</variable>

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Schema definition

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Rules definition

The Rules section defines the rules which will be used by the decision entries of each decisionTree.

Schema definition

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variables

This section contain a set of variables defined only for the rule definitions. For a description of the variables see the section above.

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	<decisionTree>
		<barrierId>scheepvaart</barrierId>
		<decision id="Stremming (peilsluiting)">
			<evaluationType>lastKnownState</evaluationType>
			<stateDefinitionId>scheepvaart</stateDefinitionId>
			<inputState>
				<stateValueId>geen stremming</stateValueId>
			</inputState>
			<conditionRules>
				<allValid>
					<anyValid>
						<isTrue>H.rotterdam.d</isTrue>
						<isTrue>H.dordrecht.d</isTrue>
					</anyValid>
					<isFalse>Q.lobith</isFalse>
				</allValid>
			</conditionRules>
			<transitionRules>
				<anyValid>
					<isTrue>scheepvaart.stremming.peilsluiting.rotterdam</isTrue>
					<isTrue>scheepvaart.stremming.peilsluiting.dordrecht</isTrue>
				</anyValid>
			</transitionRules>
			<outputState>
				<stateValueId>gestremd</stateValueId>
			</outputState>
		</decision>
		<decision id="Stremming (kenteringsluiting)">
                   ...
		</decision>
		<decision id="Vrijgeven scheepvaart">
                   ...
		</decision>
	</decisionTree>

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Decision definition

Schema definition

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evaluationType

stateDefinitionId

inputState

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	<decisionEvaluation>
		<initialConditionalWorkflow>
			<variableId>SVKH.position.in</variableId>
			<variableId>SVKW.position.in</variableId>
			<variableId>scheepvaart.in</variableId>
			<workflowId>Sobek_DSS_Forecast</workflowId>
		</initialConditionalWorkflow>
		<conditionalWorkflow>
			<variableId>SVKH.position.dss</variableId>
			<variableId>SVKW.position.dss</variableId>
			<variableId>scheepvaart.dss</variableId>
			<stateChanges>
				<evaluationType>FirstInTime</evaluationType>
				<stateChange>
					<decisionTreeId>SVKH</decisionTreeId>
				</stateChange>
				<stateChange>
					<decisionTreeId>SVKW</decisionTreeId>
				</stateChange>
				<stateChange>
					<decisionTreeId>scheepvaart</decisionTreeId>
				</stateChange>
			</stateChanges>
			<workflowId>Sobek_DSS_Forecast</workflowId>
		</conditionalWorkflow>
	</decisionEvaluation>

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After running the model for the first time, we need to evaluate the decision logic prior to a (possible) second run. If a state change occurs in the decisionTree, we need to run the model again taking this state change into account. From the second iteration and onwards, the section within the 'conditionalWorkflow' tag will be run. Note that we need to evaluate three state changes in this case (SVKH = the position of the Hartelkering, SVKW = the position of the Maeslantkering and scheepvaart = the "shipping state"), each of which has a separate decisionTree definition.

evaluationType

If one state variable changes value, this will change the overall system state, and hence may effect the evaluation of the other state variables. There are to options which can be defined:

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