31 lines
1.7 KiB
Plaintext
31 lines
1.7 KiB
Plaintext
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Prototype 2: Messaging
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This is the second proof-of-concept prototype for the OpenBeOS app_server. This demonstrates the use of the PortLink class to send messages quickly and how the server manages processes under normal circumstances (ie, not killing a team). Listed at the end of this file is the sequence of events for a particular task, utilizing only 3 types of components: the Server class, ServerApp application-monitoring nodes, and the application itself. All 3 have been built for R5. Although not formally documented, the code is relatively clean and mostly commented.
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Files Included
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OBAppServer: the actual server
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OBApp: a skeleton of what's supposed to be an app. Implemented only for testing purposes but some concepts may eventually make their way into the real OBOS BApplication class
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OBHey: Quick-and-dirty app which sends a message code (in decimal) to a specified port. For the sake of reference, B_QUIT_REQUESTED=1599165009.
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Application launch:
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1) App constructor
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2) App->server CREATE_APP
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3) Server spawns ServerApp
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4) ServerApp->App SET_PORT
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5) App reinitializes serverlink to SET_PORT port
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Application quit (from app side):
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1) ->App B_QUIT_REQUESTED
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2) App -> ServerApp B_QUIT_REQUESTED and quits
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3) ServerApp -> Server DELETE_APP and quits
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4) Server removes ServerApp from list and deletes object
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App Server quit:
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1) Right now: Server->all ServerApps (QUIT_APP)
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Eventually: Server->Registrar(BROADCAST_QUIT)
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1a) Right now: ServerApps->Apps(B_QUIT_REQUESTED)
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2) Server sets internal flag quitting_server to true
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3) When server receives DELETE_APP, checks to see if any ServerApps are left.
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4) If no ServerApps are left after deleting the sender of the delete_app message, server checks to see if quitting_server is set to true
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5) Server exits
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