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Appendix H Elevator Model (on CD) 1425 218 // pause concurrent thread for number of milliseconds 219 private void pauseThread( int milliseconds ) 220 { 221 try { 222 Thread.sleep( milliseconds ); 223 } 224 225 // handle if interrupted while sleeping 226 catch ( InterruptedException exception ) { 227 exception.printStackTrace(); 228 } 229 } // end method pauseThread 230 231 // return Button on Elevator 232 public Button getButton() 233 { 234 return elevatorButton; 235 } 236 237 // return Door on Elevator 238 public Door getDoor() 239 { 240 return elevatorDoor; 241 } 242 243 // set if Elevator should move 244 public void setMoving( boolean elevatorMoving ) 245 { 246 moving = elevatorMoving; 247 } 248 249 // is Elevator moving? 250 public boolean isMoving() 251 { 252 return moving; 253 } 254 255 // is Elevator thread running? 256 private boolean isElevatorRunning() 257 { 258 return elevatorRunning; 259 } 260 26 // register ElevatorMoveListener for ElevatorMoveEvents 26 public void addElevatorMoveListener( 26 ElevatorMoveListener listener ) 26 { 26 elevatorMoveListeners.add( listener ); 26 } 26 Fig. H.12 Class Elevatorrepresents the Elevatortraveling between two Floors, operating asynchronously with other objects (part 6 of 9).
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1424 Elevator Model (on CD) Appendix H 166 // stop Elevator thread; method run terminates 167 public void stopElevator() 168 { 169 elevatorRunning = false; 170 } 171 172 // Elevator thread’s run method 173 public void run() 174 { 175 while ( isElevatorRunning() ) { 176 177 // remain idle until awoken 178 while ( !isMoving() ) 179 pauseThread( 10 ); 180 181 // close elevatorDoor 182 getDoor().closeDoor( currentFloorLocation ); 183 184 // closing Door takes one second 185 pauseThread( ONE_SECOND ); 186 187 // issue elevatorDeparted Event 188 sendDepartureEvent( currentFloorLocation ); 189 190 // Elevator needs 5 seconds to travel 191 pauseThread( TRAVEL_TIME ); 192 193 // stop Elevator 194 setMoving( false ); 195 196 // swap Floor Locations 197 changeFloors(); 198 199 // issue elevatorArrived Event 200 sendArrivalEvent( currentFloorLocation ); 201 202 } // end while loop 203 204 } // end method run 205 206 // invoked when Person rides Elevator between Floors 207 public synchronized void ride() 208 { 209 try { 210 Thread.sleep( MAX_TRAVEL_TIME ); 211 } 212 catch ( InterruptedException exception ) { 213 // method doorOpened in Person interrupts method sleep; 214 // Person has finished riding Elevator 215 } 216 } 217 Fig. H.12 Class Elevatorrepresents the Elevatortraveling between two Floors, operating asynchronously with other objects (part 5 of 9).
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Appendix H Elevator Model (on CD) 1423 118 String locationName = location.getLocationName(); 119 120 // open Door on Floor Location 121 if ( !locationName.equals( ELEVATOR_NAME ) ) 122 location.getDoor().openDoor( location ); 123 124 // send DoorEvent to listener 125 elevatorDoorListener.doorOpened( new DoorEvent( 126 doorEvent.getSource(), Elevator.this )); 127 } 128 129 // invoked when elevatorDoor has closed 130 public void doorClosed( DoorEvent doorEvent ) 131 { 132 // get Location associated with DoorEvent 133 Location location = doorEvent.getLocation(); 134 String locationName = location.getLocationName(); 135 136 // close Door on Floor Location 137 if ( !locationName.equals( ELEVATOR_NAME ) ) 138 location.getDoor().closeDoor( location ); 139 140 // send DoorEvent to listener 141 elevatorDoorListener.doorClosed( new DoorEvent( 142 doorEvent.getSource(), Elevator.this )); 143 } 144 } // end anonymous inner class 145 ); 146 } // end Elevator constructor 147 148 // swaps current Floor Location with opposite Floor Location 149 private void changeFloors() 150 { 151 Location location = currentFloorLocation; 152 currentFloorLocation = destinationFloorLocation; 153 destinationFloorLocation = location; 154 } 155 156 // start Elevator thread 157 public void start() 158 { 159 if ( thread == null ) 160 thread = new Thread( this ); 161 162 elevatorRunning = true; 163 thread.start(); 164 } 165 Fig. H.12 Class Elevatorrepresents the Elevatortraveling between two Floors, operating asynchronously with other objects (part 4 of 9).
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Appendix H Elevator Model (on CD) 1423 118 String locationName = location.getLocationName(); 119 120 // open Door on Floor Location 121 if ( !locationName.equals( ELEVATOR_NAME ) ) 122 location.getDoor().openDoor( location ); 123 124 // send DoorEvent to listener 125 elevatorDoorListener.doorOpened( new DoorEvent( 126 doorEvent.getSource(), Elevator.this )); 127 } 128 129 // invoked when elevatorDoor has closed 130 public void doorClosed( DoorEvent doorEvent ) 131 { 132 // get Location associated with DoorEvent 133 Location location = doorEvent.getLocation(); 134 String locationName = location.getLocationName(); 135 136 // close Door on Floor Location 137 if ( !locationName.equals( ELEVATOR_NAME ) ) 138 location.getDoor().closeDoor( location ); 139 140 // send DoorEvent to listener 141 elevatorDoorListener.doorClosed( new DoorEvent( 142 doorEvent.getSource(), Elevator.this )); 143 } 144 } // end anonymous inner class 145 ); 146 } // end Elevator constructor 147 148 // swaps current Floor Location with opposite Floor Location 149 private void changeFloors() 150 { 151 Location location = currentFloorLocation; 152 currentFloorLocation = destinationFloorLocation; 153 destinationFloorLocation = location; 154 } 155 156 // start Elevator thread 157 public void start() 158 { 159 if ( thread == null ) 160 thread = new Thread( this ); 161 162 elevatorRunning = true; 163 thread.start(); 164 } 165 Fig. H.12 Class Elevatorrepresents the Elevatortraveling between two Floors, operating asynchronously with other objects (part 4 of 9).
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1422 Elevator Model (on CD) Appendix H 66 // instantiate listener Set 67 elevatorMoveListeners = new HashSet( 1 ); 68 69 // start Elevator on first Floor 70 currentFloorLocation = firstFloor; 71 destinationFloorLocation = secondFloor; 72 73 // register elevatorButton for ElevatorMoveEvents 74 addElevatorMoveListener( elevatorButton ); 75 76 // register elevatorDoor for ElevatorMoveEvents 77 addElevatorMoveListener( elevatorDoor ); 78 79 // register bell for ElevatorMoveEvents 80 addElevatorMoveListener( bell ); 81 82 // anonymous inner class listens for ButtonEvents from 83 // elevatorButton 84 elevatorButton.setButtonListener( 85 new ButtonListener() { 86 87 // invoked when elevatorButton has been pressed 88 public void buttonPressed( ButtonEvent buttonEvent ) 89 { 90 // send ButtonEvent to listener 91 elevatorButtonListener.buttonPressed( 92 buttonEvent ); 93 94 // start moving Elevator to destination Floor 95 setMoving( true ); 96 } 97 98 // invoked when elevatorButton has been reset 99 public void buttonReset( ButtonEvent buttonEvent ) 100 { 101 // send ButtonEvent to listener 102 elevatorButtonListener.buttonReset( 103 buttonEvent ); 104 } 105 } // end anonymous inner class 106 ); 107 108 // anonymous inner class listens for DoorEvents from 109 // elevatorDoor 110 elevatorDoor.addDoorListener( 111 new DoorListener() { 112 113 // invoked when elevatorDoor has opened 114 public void doorOpened( DoorEvent doorEvent ) 115 { 116 // get Location associated with DoorEvent 117 Location location = doorEvent.getLocation(); Fig. H.12 Class Elevatorrepresents the Elevatortraveling between two Floors, operating asynchronously with other objects (part 3 of 9).
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Appendix H Elevator Model (on CD) 1421 14 15 // manages Elevator thread 16 private boolean elevatorRunning = false; 17 18 // describes Elevator state (idle or moving) 19 private boolean moving = false; 20 21 // current Floor 22 private Location currentFloorLocation; 23 24 // destination Floor 25 private Location destinationFloorLocation; 26 27 // Elevator needs to service other Floor 28 private boolean summoned; 29 30 // listener objects 31 private Set elevatorMoveListeners; 32 private ButtonListener elevatorButtonListener; 33 private DoorListener elevatorDoorListener; 34 private BellListener bellListener; 35 36 // Door, Button and Bell on Elevator 37 private Door elevatorDoor; 38 private Button elevatorButton; 39 private Bell bell; 40 41 public static final int ONE_SECOND = 1000; 42 43 // time needed to travel between Floors (5 seconds) 44 private static final int TRAVEL_TIME = 5 * ONE_SECOND; 45 46 // max travel time for Elevator (20 minutes) 47 private static final int MAX_TRAVEL_TIME = 48 20 * 60 * ONE_SECOND; 49 50 // Elevator’s thread to handle asynchronous movement 51 private Thread thread; 52 53 // constructor creates variables; registers for ButtonEvents 54 public Elevator( Floor firstFloor, Floor secondFloor ) 55 { 56 setLocationName( ELEVATOR_NAME ); 57 58 // instantiate Elevator’s Door, Button and Bell 59 elevatorDoor = new Door(); 60 elevatorButton = new Button(); 61 bell = new Bell(); 62 63 // register Elevator for BellEvents 64 bell.setBellListener( this ); 65 Fig. H.12 Class Elevatorrepresents the Elevatortraveling between two Floors, operating asynchronously with other objects (part 2 of 9).
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1420 Elevator Model (on CD) Appendix H According to Fig. 15.21, class Bell does not contain attributes, because the Bell does not change state. However, Fig. 15.21 specifies that class Bell contains method ringBell (lines 14 19), which rings the Bell by invoking method bellRang of the BellListener bellListener (line 11). In our simulation, the Elevator is the bellListener the Elevatorreceives event from the Bell, then sends the event to the ElevatorShaft, which sends the event to the ElevatorModel, which sends the event to the ElevatorView. The ElevatorView then plays an audio clip of a bell ringing. The Elevator uses method setBellListener (lines 22 24) to register for BellEvents from the Bell. According to Fig. H.2, class Bellimplements interface ElevatorMoveListener. Line 28 and lines 31 34 list methods elevatorDeparted and elevatorArrived, respectively. In our simulation, the Bellrings when the Elevatorhas arrived. H.8 Class Elevator Class Elevator (Fig. H.12) represents the elevator car that travels between the two Floors in the ElevatorShaftwhile carrying a Person. According to the class diagram of Fig. 15.21, class Elevator contains one object each of classes Button, Door and Bell lines 37 39 declare objects elevatorButton, elevatorDoor and bell. As discussed in Section 9.23, class Elevatorextends superclass Location, because the Elevatoris a location that the Personcan occupy. Class Elevatorimplements methods getButton (lines 232 235) and getDoor(lines 238 241) provided by class Location. Method getButton returns the elevatorButton and method getDoor returns the elevatorDoor. According to Fig. 15.21, we also must include two Location objects one named currentFloor (line 22), which represents the current Floor being serviced, and the other named destinationFloor (line 25), which represents the Floor at which the Elevator will arrive. In addition, Fig. 15.21 specifies that class Elevator requires booleanvariable moving(line 19), which describes whether the Elevator is moving or idle, and boolean variable summoned (line 28), which describes whether the Elevatorhas been summoned. Also, class Elevatoruses intconstant TRAVEL_TIME(line 44), which indicates the five second travel time between Floors. 1 // Elevator.java 2 // Travels between Floors in the ElevatorShaft 3 package com.deitel.jhtp4.elevator.model; 4 5 // Java core packages 6 import java.util.*; 7 8 // Deitel packages 9 import com.deitel.jhtp4.elevator.event.*; 10 import com.deitel.jhtp4.elevator.ElevatorConstants; 11 12 public class Elevator extends Location implements Runnable, 13 BellListener, ElevatorConstants { Fig. H.12 Class Elevatorrepresents the Elevatortraveling between two Floors, operating asynchronously with other objects (part 1 of 9).
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Appendix H Elevator Model (on CD) 1419 Lightinstantiate a thread that handles this responsibility. Method run(lines 45 57) puts this thread to sleep for three seconds, then turns off the Light. Line 61 of method turn- OnLightstarts the thread. According to Fig. H.2, class Light implements interface ElevatorMoveListener. Lines 85 89 and lines 92 96 list methods elevatorDeparted and elevatorArrived, respectively. In our model, the Lightturns off when the Elevatorhas departed, and the Lightturns on when the Elevatorhas arrived. Class Bell (Fig. H.11) represents the Bell in the model and sends a bellRang event to a BellListenerwhen the Bellhas rung. This event eventually bubbles up to the ElevatorView. The ElevatorViewplays an audio clip of a bell ringing upon receiving a bellRang event. 1 // Bell.java 2 // Represents Bell in simulation 3 package com.deitel.jhtp4.elevator.model; 4 5 // Deitel packages 6 import com.deitel.jhtp4.elevator.event.*; 7 8 public class Bell implements ElevatorMoveListener { 9 10 // BellListener listens for BellEvent object 11 private BellListener bellListener; 12 13 // ring bell and send BellEvent object to listener 14 private void ringBell( Location location ) 15 { 16 if ( bellListener != null ) 17 bellListener.bellRang( 18 new BellEvent( this, location ) ); 19 } 20 21 // set BellListener 22 public void setBellListener( BellListener listener ) 23 { 24 bellListener = listener; 25 } 26 27 // invoked when Elevator has departed 28 public void elevatorDeparted( ElevatorMoveEvent moveEvent ) {} 29 30 // invoked when Elevator has arrived 31 public void elevatorArrived( ElevatorMoveEvent moveEvent ) 32 { 33 ringBell( moveEvent.getLocation() ); 34 } 35 } Fig. H.11 Class Bellrepresents the Bellin the model.
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1418 Elevator Model (on CD) Appendix H 61 thread.start(); 62 } 63 } // end method turnOnLight 64 65 // turn off Light 66 public void turnOffLight( Location location ) 67 { 68 if ( lightOn ) { 69 70 lightOn = false; 71 72 // send LightEvent to LightListener 73 lightListener.lightTurnedOff( 74 new LightEvent( this, location ) ); 75 } 76 } // end method turnOffLight 77 78 // return whether Light is on or off 79 public boolean isLightOn() 80 { 81 return lightOn; 82 } 83 84 // invoked when Elevator has departed 85 public void elevatorDeparted( 86 ElevatorMoveEvent moveEvent ) 87 { 88 turnOffLight( moveEvent.getLocation() ); 89 } 90 91 // invoked when Elevator has arrived 92 public void elevatorArrived( 93 ElevatorMoveEvent moveEvent ) 94 { 95 turnOnLight( moveEvent.getLocation() ); 96 } 97 } Fig. H.10 Class Lightrepresents a Lighton the Floorin the model (part 3 of 3). According to Fig. 15.21, class Light contains attribute lightOn (line 11), which represents the state of the Light (on or off). In addition, Fig. 15.21 specifies that class Lightcontains methods turnOnLight(lines 29 63) and turnOffLight(lines 66 76). Line 33 of method turnOnLightsets attribute lightOnto true, and lines 36 37 call method lightTurnedOn of the lightListener (line 17). In our model, the ElevatorShaft is the lightListener the ElevatorShaft receives events from the Lightand sends them to the ElevatorModel, which sends them to the ElevatorView. The ElevatorShaftuses method setLightListener(lines 23 26) to register for LightEvents. Method turnOffLight sets attribute lightOn to false, then calls method lightTurnedOffof the lightListener. We decided in Section 15.12 to make class Lightan active class, so that the Light turns itself off after three seconds of being illuminated. Lines 42 59 of method turnOn
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Appendix H Elevator Model (on CD) 1417 8 public class Light implements ElevatorMoveListener { 9 // Light state (on/off) 11 private boolean lightOn; 12 13 // time before Light turns off automatically (3 seconds) 14 public static final int AUTOMATIC_TURNOFF_DELAY = 3000; 15 16 // LightListener listens for when Light should turn on/off 17 private LightListener lightListener; 18 19 // location where Light turned on or off private Location lightLocation; 21 22 // set LightListener 23 public void setLightListener( LightListener listener ) 24 { 25 lightListener = listener; 26 } 27 28 // turn on Light 29 public void turnOnLight( Location location ) { 31 if ( !lightOn ) { 32 33 lightOn = true; 34 35 // send LightEvent to LightListener 36 lightListener.lightTurnedOn( 37 new LightEvent( this, location ) ); 38 39 lightLocation = location; 41 // declare Thread that ensures automatic Light turn off 42 Thread thread = new Thread( 43 new Runnable() { 44 45 public void run() 46 { 47 // turn off Light if on for more than 3 seconds 48 try { 49 Thread.sleep( AUTOMATIC_TURNOFF_DELAY ); turnOffLight( lightLocation ); 51 } 52 53 // handle exception if interrupted 54 catch ( InterruptedException exception ) { 55 exception.printStackTrace(); 56 } 57 } 58 } // end anonymous inner class 59 ); Fig. H.10 Class Lightrepresents a Lighton the Floorin the model (part 2 of 3).
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