102 lines
3.8 KiB
HTML
102 lines
3.8 KiB
HTML
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<html>
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<head>
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<title>Registrar Notes</title>
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</head>
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<body bgcolor='#ffffff'>
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<font face='Tahoma,Arial,SansSerif'>
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<!-- Tasks -->
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<hr>
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<b>Registrar Tasks:</b>
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<ul>
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<li> MIME Database chores (note that BMimeType appears to read from the database directly for <code>Get*()</code> calls.)<br>
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<ul>
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<li> Writes to the database -- <code>SetLongDescription(), SetPreferredApp(), create_app_meta_mime(), etc</code>
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<li> Monitoring of the database -- <code>{Start,Stop}Watching()</code> <br>
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<li> Sniffer duties -- Sniffer code plus <code>{Get,Set,Check}SnifferRule()</code>
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</ul>
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<br>
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<li> Timing chores
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<ul>
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<li> BMessageRunner functionality
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</ul>
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<li> System Shutdown chores <br>
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<ul>
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<li> Shutdown cycle
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<li> System shutdown window
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</ul>
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<li> Roster chores
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<ul>
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<li> Recent documents, folders, and apps
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<li> Info about running applications
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<li> etc...
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</ul>
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</ul>
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<!-- Internals -->
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<hr>
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<b>Registrar Internals:</b><br>
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<br>
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The registrar is a non-standard <code>BApplication</code>. It has a shadow app in the <code>app_server</code>
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like a normal <code>BApplication</code>, but one of its ports is slightly different:
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<ul>
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<li> Standard ports -- snd, rcv, AppLooperPort
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<li> Registrar ports -- snd, rcv, _roster_port_
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</ul>
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Since <code>BLooper::port_id</code> is private to <code>BLooper</code> (to whom <code>BApplication</code>
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is a friend), and since you can't rename a port after it's been created,
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it's likely that the only way to rename the <code>AppLooperPort</code> and have the registrar
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still be a <code>BApplication</code> is to have <code>BApplication</code> check if it's the
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registrar when it's created, and use <code>_roster_port_</code> as the name for what would
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otherwise be its <code>AppLooperPort</code>.
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<br>
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<br>
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The rationale behind having a port with a specific name is that the registrar
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implements the roster functionality. Thus one can't address it using the app signature
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constructor of BMessenger, but rather must send the message directly to
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a named port (for example, upon creation, a BApplication object must find and contact
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the registrar to notify it of another running application; if the registrar
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cannot be found, the application putzes out).
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<br>
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<br>
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The Registrar has three threads:
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<ul>
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<li> _roster_thread_
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<li> timer_thread
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<li> main_mime
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</ul>
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<!-- BMimeType Notes -->
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<hr>
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<b>BMimeType Notes:</b>
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<ul>
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<li> The <code>Get*()</code> methods directly access the MIME database.
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<li> The <code>Set*()</code> methods send a message to another entity which does the job.
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The function that does the sending is called <code>_send_to_roster_()</code>, so I
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suppose the roster is the one. Since the registrar has a thread named
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<code>_roster_thread_</code>, I assume the roster lives in the registrar.
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<li> <code>Start/StopWatching()</code> call <code>BRoster::_Start/_StopWatching()</code>.
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<li>Adding/removing a MIME type file in <code>~/config/settings/beos_mime/*/</code> does
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not trigger a notification message. So obviously no node monitoring is
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done and changes to the database are supposed to be done using the API.
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</ul>
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<!-- Links -->
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<hr>
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<b>Links:</b>
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<ul>
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<li> <a href='http://www.beatjapan.org/mirror/www.be.com/users/iconworld/icon5.html'>Icon World -- The Registrar</a>
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<li> <a href='http://www.beosbible.com/exc_filetype.html'>The BeOS Bible -- File Typing and The Registrar</a>
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<li> <a href='http://bang.dhs.org/be/bebook/The%20Application%20Kit/Application.html'>BApplication</a>
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<li> <a href='http://bang.dhs.org/be/bebook/The%20Storage%20Kit/MimeType.html'>BMimeType</a>
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<li> <a href='http://bang.dhs.org/be/bebook/Release%20Notes/StorageKit.html'>BMimeType (sniffer docs)</a>
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<li> <a href='http://bang.dhs.org/be/bebook/The%20Application%20Kit/Roster.html'>BRoster</a>
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</font>
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</body>
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</html>
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