Hermes: A Tutorial and Reference Manual - Researcher - IBM
Hermes: A Tutorial and Reference Manual - Researcher - IBM
Hermes: A Tutorial and Reference Manual - Researcher - IBM
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name.Ifwewaitedtobuildtheapplicationrst<strong>and</strong>thencheckfora DuplicateKeyexception,theillegalapplicationmayhavealreadystarted 482.7.TheWindowManager exceptionbycheckingrstfortheexistenceofawindowwithidentical running<strong>and</strong>mayhavealreadyproducedoutput.Theexistsofoperator checksforthiscase.Thisoperationtakesaselector<strong>and</strong>evaluatestotrue if<strong>and</strong>onlyifoneormoreselectedelementsexist. TheonlytrickybitisthatwemustavoidthepossibilityofaDuplicateKey Todestroyawindow,wesimplyremovethewindowdescriptorfromthe endif;<br />
application.ThisservicewillcallQuitonthebuerprocess<strong>and</strong>theadapter process,withtheresultthattheclientprocesswillshutdown. tableofcreatedwindows<strong>and</strong>thencalltheQuitportassociatedwiththat eventKill receiveKillCMfromKill;<br />
endblock; on(NotFound) blockbegin callCurrentWindow.Quit(); returnKillCMexceptionNotFound; --erroraction discardCurrentWindow; returnKillCM; removeCurrentWindowfromCreatedWindows[KillCM.WindowName];<br />
eventGetFocus receiveGetFocusCMfromGetFocus; then ifCurrentFocus""<br />
portsfromprocesstoprocess. thiscodewhenyouhavetables,exceptionh<strong>and</strong>ling,<strong>and</strong>theabilitytopass Thisnishesthewindowmanager.Noticehowconvenientitistowrite endif; else returnGetFocusCMexceptionNotFound; returnGetFocusCM; GetFocusCM.Focus:=CurrentFocus;<br />
isastraightforwardvariationofFilter. 2.8CreatingaWindowApplication orWMSystem,itshouldbeeasytobuildApplicationBuilder.AndAdapter Allthatisleftaretheapplicationbuilder,theadapter,<strong>and</strong>thequitdispatcher.Theseprogramsusenonewprinciples.IfyoucanbuildCompound
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