82 lines
1.7 KiB
Tcl
82 lines
1.7 KiB
Tcl
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#
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# room.tcl -- Tcl/Tk script for conferencing server;
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#
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package require dp 4.0
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set port 9943;
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# The following command creates an RPC server socket on
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# the given port.
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#
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dp_MakeRPCServer $port
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# names -- list of room occupants
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# files -- list of active rpc files
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#
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set names {};
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set files {};
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# The following are procedures available through RPC to
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# clients of the conferencing server.
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#
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proc Enter {name} \
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{
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# Before any RPC command (such as this Enter) gets evaluated,
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# the global variable dp_rpcFile is set to the file handle
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# of the RPC connection currently being serviced.
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#
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global names;
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global files;
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global dp_rpcFile;
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# Remember the name and the associated RPC file handle
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# of the client who just entered the room;
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#
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lappend names $name;
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lappend files $dp_rpcFile;
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# Arrange to remove the information from the names and files list
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# when the connection is closed.
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dp_atclose $dp_rpcFile append "Leave $name $dp_rpcFile"
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}
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# The following command is invoked automatically when a file is closed
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# This can happend because a server dies unexpectedly. The callback is
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# created by the "dp_atclose" call above. The two parameters give the
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# rpc file and the name of the person.
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#
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proc Leave {n f} \
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{
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global names;
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global files;
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set files [ldelete $files $f]
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set names [ldelete $names $n]
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}
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proc Say {message} \
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{
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global names;
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global files;
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global dp_rpcFile;
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# Figure out the client who said the message;
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#
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set speaker [lindex $names [lsearch $files $dp_rpcFile]];
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# Tell all clients to Hear the message from the speaker;
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#
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foreach client $files \
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{
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dp_RPC $client Hear $speaker $message;
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}
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}
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