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110 lines
3.4 KiB
110 lines
3.4 KiB
Applet creation:
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kicker creates an Applet object via the extern "C" `init' function in
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Applet.cpp
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Structure:
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The main classes:
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ActiveMonitor
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Shows a list of ActiveMonitorItem objects.
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ActiveMonitorItem
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Shows details of a request belonging to a Server object.
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Applet
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Contains a set of AppletItem.
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AppletItem
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Contains a BandwidthGraph and additionally provides a popup menu.
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BandwidthGraph
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Shows a graph of the bandwidth usage of a Server object.
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Server
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Serves requests on a connection from a remote client.
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May serve more than one request per connection (this is HTTP persistence.)
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Creates Request object on incoming request.
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Creates Response object when incoming request is fully received.
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Sends Request and Response objects out via Q_SIGNALS, so that they
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may be used by ActiveMonitorItem objects.
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WebServer
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Listens for incoming requests.
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Creates and manages Server objects.
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WebServerManager
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Singleton.
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Creates and manages WebServer objects.
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Startup:
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1. Applet creates WebServerManager singleton (requests pointer to instance.)
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2. WebServerManager reads config and creates WebServers.
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3. Applet is informed via signal as each WebServer is created, and creates
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AppletItem for each.
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4. AppletItem creates BandwidthGraph.
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5. BandwidthGraph connects itself to the new WebServer.
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6. Repeated until all saved WebServers have been created.
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7. Return to event loop.
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Creation of server by user:
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1. Via Konqueror properties dialog plugin, context menu on AppletItem, or
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context menu on `bare' Applet, user is asked to configure server.
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From the Konqueror plugin, a simple configuration interface is used.
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From the context menu on the AppletItem or Applet, a ServerWizard is
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created.
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2. If a WebServer is created (user accepts) then the Applet is informed
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and the procedure continues as in Startup, step 4.
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Run cycle:
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1. Connection received by a WebServer.
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2. WebServer checks connection limit, if OK creates Server.
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3. Server creates Request object from data supplied by client.
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4. Server emits request(), passing Request object.
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5. WebServer emits request(), passing Request object.
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6. ActiveMonitor creates ActiveMonitorItem using Request object data.
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7. Server generates appropriate Response object.
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8. Server emits response(), passing Response object.
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9. WebServer emits response(), passing Response object.
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10. ActiveMonitor passes Response to relevant ActiveMonitorItem, which updates.
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11. Server passes data to client.
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12. Server emits finished().
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13. WebServer emits finished().
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14. ActiveMonitor informs relevant ActiveMonitorItem that Server is finished.
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15. WebServer deletes Server.
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16. (after delay) ActiveMonitorItem is removed by ActiveMonitor.
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Bandwidth limiting:
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Limiting really applies to outgoing traffic only. If `too much' incoming
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traffic is received by a Server object, it simply drops the connection.
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A WebServer object is responsible for bandwidth management.
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A Server object may not send data until it is told to by its parent (WebServer)
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object. A Server object sends a readyToWrite(this) signal when it has data to
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send.
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A WebServer object will call Server::write(number of bytes) when it wishes
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to allow a Server to send data.
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Connection limiting:
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A WebServer object is responsible for connection limiting. When there are
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`too many' Server objects, it will simply queue up incoming connections
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until its backlog is too long, at which point it will simply ignore further
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incoming connections.
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