Class AltitudeSwitch

java.lang.Object
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  +--edu.umn.cs.crisys.RSM
        |
        +--edu.umn.cs.crisys.ASW
              |
              +--AltitudeSwitch

public class AltitudeSwitch

extends ASW

Title: Altitude Switch

Description: Altitude Switch Implementation for CSCI 5802

This is a sample altitude switch implementation that demonstrates how one may use the ASW framework to derive a concrete implementation.

Functionally, this just looks at the altitude input from the first altimeter, ignores its altitude quality, and outputs a DOI command based on whether the altitude is above or below the threshold. If the inhibit flag is set it does not output any command to the DOI.

The inner class ASWState is a structure to hold the state information. Two objects, cur and prev, are instances of this structure. These hold the current and previous state information of the altitude switch. This class overrides the init method to initialize its internal state variables but calls super.init() to open the interfaces. There is no implementation specific clean-up operations required when stopping the state-machine and so this class does not override the end() method.

The next method() does the bulk of the work. It takes an interface object as a parameter. This indicates which interface received a message triggering next state computation. Note that the object may also be null, indicating that no interface received message, but just that time has progressed.

Copyright: Copyright (c) 2002 University of Minnesota

Inner classes inherited from class edu.umn.cs.crisys.ASW

ASW.AltitudeMessage, ASW.AltitudeQualityType, ASW.ASW_Constants, ASW.DOICommandMessage, ASW.DOIStatusMessage, ASW.DOIStatusType, ASW.EmptyMessage, ASW.FaultMessage, ASW.InhibitMessage, ASW.InhibitType

Inner classes inherited from class edu.umn.cs.crisys.RSM

RSM.Enum, RSM.ReceiveInterface, RSM.SendInterface

Fields inherited from class edu.umn.cs.crisys.ASW

AltitudeMessageInterface, DOICommandInterface, DOIStatusMessageInterface, FaultDetectionInterface, InhibitMessageInterface, ResetMessageInterface

Constructor Summary

AltitudeSwitch()

Method Summary

protected void	init() Initialization step for the state-machine.
protected void	next(java.lang.Object trigger) Step computation routine of the Altitude Switch.

Methods inherited from class edu.umn.cs.crisys.ASW

end

Methods inherited from class edu.umn.cs.crisys.RSM

main

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AltitudeSwitch

public AltitudeSwitch()

Method Detail

init

protected void init()

Initialization step for the state-machine. Calls the super class init() method to open interface channels for communication.

Overrides:

init in class ASW

next

protected void next(java.lang.Object trigger)

Step computation routine of the Altitude Switch. This is called by the state machine driver whenever there is some change in the environment as detected at the communication interfaces or when time has progressed.

Overrides:

next in class RSM

Parameters:

Interface - that received message in this step or null if next step computation is called due to time progression.