Design Considerations and Design Considerations and Implementation of a Implementation of a

Persistent Constellation Persistent Constellation Launch Control System Launch Control System Dashboard Data Display Dashboard Data Display

FrameworkFrameworkMatthew A. NoyesMatthew A. Noyes

Rochester Institute of Rochester Institute of TechnologyTechnology

RequirementsRequirements UTC Time DisplayUTC Time Display Countdown Time DisplayCountdown Time Display System Status IndicatorSystem Status Indicator Countdown Time Go/Hold IndicatorCountdown Time Go/Hold Indicator User InformationUser Information Embedded Shift Change LoginEmbedded Shift Change Login Dynamic System Application Menu Dynamic System Application Menu

GeneratorGenerator Must not overlay other system application Must not overlay other system application

windows.windows.

Design ConsiderationsDesign Considerations

GNOME Panel AppletGNOME Panel Applet

Potential AdvantagesPotential Advantages Reduce custom development timeReduce custom development time Screen real-estate reservation features Screen real-estate reservation features

already implementedalready implemented Glade Interface BuilderGlade Interface Builder

GNOME Panel AppletGNOME Panel Applet

Potential DisadvantagesPotential Disadvantages Bonobo deprecationBonobo deprecation No Java language bindingsNo Java language bindings High MaintenanceHigh Maintenance

.server file definition.server file definition Heavy manipulation of profile settingsHeavy manipulation of profile settings

C/GTK+ ApplicationC/GTK+ Application

Potential AdvantagesPotential Advantages Glade Interface BuilderGlade Interface Builder Java bindingsJava bindings GTK wrappers for X server callsGTK wrappers for X server calls

C/GTK+ ApplicationC/GTK+ Application

Potential DisadvantagesPotential Disadvantages Cannot maintain consistent look and Cannot maintain consistent look and

feel or communication with other LCS feel or communication with other LCS ApplicationsApplications

Too many external dependenciesToo many external dependencies LibGlade to parse the GUILibGlade to parse the GUI GTK to render the GUIGTK to render the GUI

Java/Swing ApplicationJava/Swing Application

Potential AdvantagesPotential Advantages Cross-platform developmentCross-platform development Reduced dependenciesReduced dependencies Intrinsic Java Message Bus Intrinsic Java Message Bus

communicationcommunication Consistent look/feel/integration with Consistent look/feel/integration with

other LCS Applicationsother LCS Applications

Java/Swing ApplicationJava/Swing Application

Potential DisadvantagesPotential Disadvantages GUI implemented with machine-GUI implemented with machine-

generated codegenerated code No intrinsic method to control/reserve No intrinsic method to control/reserve

screen real estatescreen real estate

Java/Swing Prototype Java/Swing Prototype ImplementationImplementation

• Image logo enhances presentation quality/acts as a visual waypoint to most important information

• User information allows for quick reference for user, and additionally acts as an identifier when a screenshot is taken

• System Time/Countdown Time

• Font and location provide visual clues of information criticality

• System/Countdown Go/No Go status indicator. Pulsating icons augment presentation quality while acting as visual information cues

• Shift Change login allows users to quickly and efficiently change shifts without complex menu interaction or exiting Desktop session

• Menu obtains a pressed/non-pressed relief and icon changes to visually reflect open/closed menu state.

• The open menu is static and is closed when any other is opened.

• Subdirectories contain other executables, and cannot be executed themselves (though they may be selected).

• The menu can also be closed with the “Close” button.

• The “Run” button executes all selected files and then closes the menu.

• Selected executables appear highlighted. More than one executable can be selected with Ctrl+Click, and several in sequence with Shift+Click.

• Double-clicking will execute all selected files but will not close the menu.

The Menu SubsystemThe Menu Subsystem

Dynamic Menu GenerationDynamic Menu Generation Menu root directories stored in XML fileMenu root directories stored in XML file

Custom SAX Parser (event driven)Custom SAX Parser (event driven)

Launchers/Shortcut buttonsLaunchers/Shortcut buttons Quick access to common/critical functionalityQuick access to common/critical functionality

Interfaces with Strut ManagerInterfaces with Strut Manager Automatically wraps menus onto additional Automatically wraps menus onto additional

strut-enabled menu barsstrut-enabled menu bars See Component Model for implementation See Component Model for implementation

detailsdetails

The Strut Manager The Strut Manager SubsystemSubsystem

Window Struts in CWindow Struts in C Low level X functionsLow level X functions

Window Struts in JavaWindow Struts in Java Java Native InterfaceJava Native Interface C Dynamic LibraryC Dynamic Library JWindowJWindow Strut manager classStrut manager class

Component Model for Component Model for implementation detailsimplementation details

Java Caller

C Dynamic Library

long

pointer

pointer

long

Setting Struts in CSetting Struts in C• Atoms

• _NET_WM_STRUT

• _NET_WM_STRUT_PARTIAL

• _NET_WM_WINDOW_TYPE

• _NET_WM_WINDOW_TYPE_DOCK

• Functions

• XOpenDisplay(display_name)

• XCreateSimpleWindow(display, parent, x, y, width, height, border_width, border, background)

• XInternAtom(display, atom_name, only_if_exists)

• XChangeProperty(display, window, property_atom, atom_type, bit_format, property_mode, data, num_elements)

• XMapWindow(display *d, window)

• XNextEvent(display, event_return)

Component ModelComponent Model

Performance Analysis: Performance Analysis: CPU UsageCPU Usage

Active Dashboard

Idle Dashboard

Performance Analysis: Performance Analysis: Memory UsageMemory Usage

Idle Dashboard

Active Dashboard

Questions?Questions?