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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egin Quit:QuitIn; QuitCM:QuitInterface; newQuit;connectParms.QuittoQuit; receiveParmsfromInit; Quit1:=Parms.Quit1; 2.AMiniatureSystem53<br />
Quit2:=Parms.Quit2; returnParms; receiveQuitCMfromQuit; callQuit1(); callQuit2();<br />
simplied,butitillustratesmanyfeaturesofrealsystems.Forexample, 2.9Summary Inthissection,wehavebuiltacompleteminiaturesystem.Thesystemis endprocess returnQuitCM;<br />
itisafunctionalenhancement|windows|whichcanoperatewithclient programswhichweredesignedpriortotheenhancement.Itistransparent| thatis,theclientprogramsdonotneedtobechangedtousewindows. Itachievesthistransparencybyexploiting<strong>Hermes</strong>'abilitytorebindany outputporttoaninputportofmatchinginterface.Furthermore,because windowsystemitselfwithinoneofitsownwindowstogetnestedwindows. thewindowsystemasawholelookslikeast<strong>and</strong>ardclient,wecanrunthe<br />
<strong>and</strong>deleted. namically.Inthiscase,clientapplications<strong>and</strong>theportstothemareadded terminatingtheadapter. clientcanbeconstrainedtowriteonlyintotheappropriatewindow.And outputporttoanadapterwhichcallsaparticularwindow|thereforethe thewindowmanagercanrevokeanerrantclient'saccesstothewindowby Thisexampleillustrateshowwedividetheresponsibility<strong>and</strong>knowledge Thewindowmanagerillustrateshowsystemsaddordeleteservicesdy-<br />
Theapplicationbuilderillustratesaccesscontrol.Theclientispassedan<br />
convertbetweendierentinterfaces,<strong>and</strong>alsoallowaservicetobecut Thewindowmanagerh<strong>and</strong>lesthesetofwindowapplications|itprimarily dealswiththetableofactivewindows.Theadapter<strong>and</strong>buerprocesses amongtheprocessesofasystem.Thefrontenddealswithinputfromthe enduser.Itdoesstringh<strong>and</strong>ling,<strong>and</strong>convertsstringcomm<strong>and</strong>stocalls. o.Thewindowsystem<strong>and</strong>applicationbuilderprocessesload<strong>and</strong>link togetherotherprocesses. st<strong>and</strong>theessentialconcepts<strong>and</strong>usesof<strong>Hermes</strong>.Itshouldbeastraightfor- Ifyouunderst<strong>and</strong>howthewindowmanagersystemisbuilt,youunder-
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