Main page -> Midware component reference -> TAppserver
Overview
TAppServer is the communication kernel for all MidWare application servers. This component handle all the communication work for the application server, keeping track of user connections and sessions. A complete application server is made of a TAppserver component, a TRequestBroker (Object Request Broker) component and a set of TServerObject descendent components.
Properties
| Banner |
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The banner property is the text that is sent to the client when the connection has been established. Default value is 'Welcome to MidWare server'.
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| ClientCount |
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Gives the actual number of connected clients.
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| ClientCountLabel |
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If assigned, this property will be used by TAppServer component to display the number of client connected.
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| ClientTimeout |
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ClientTimeout gives the time in seconds before the server disconnect a client without activity.
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| ClientWSocket |
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ClientWSocket is a run-time read-only indexed property whose value is the reference to each connected client TClientWSocket component.
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| ConnectCount |
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ConnectCount gives the total number of connection received since server startup.
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| DisplayMemo |
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If assigned, this property will be used by TAppServer component to display messages during work.
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| Handle |
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The Handle property is the windows handle for the hidden window the component uses for internal messages
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| Options |
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Options are used by TAppServer to modify behaviour.
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| Port |
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The port property gives the port number or service name used by the server to listen for client connection.
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| RequestBroker |
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The server component receive client requests, data parameters and send replies to client.
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| RequestCount |
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RequestCount gives the total number of requests received since server startup.
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| SrvWSocket |
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SrvWSocket is the underlaying TWSocket component used to listen for for client connections.
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| Timeoutlnterval |
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The server periodically check for client timeout.
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Methods
| DisconnectAll |
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Disconnect every connected client. Do not confuse with the Stop method.
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| Start |
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The start procedure will start the server. The server will accept new client connections. See also Stop.
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| Stop |
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The Stop procedure will stop the server which will no more accept new clients, but will not disconnect already connected clients. See also Start.
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Events
| OnAfterProcessRequest |
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Occurs when a request has been processed.
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| OnAfterSendReply |
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Occurs just after a reply has been sent.
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| OnBeforeProcessRequest |
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Occurs before a client request is processed, just after it has been received.
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| OnBeforeSendReply |
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The OnBeforeSendReply event is called when a reply is ready to be transmitted to the client.
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| OnClientConnected |
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This event is triggered when a client connect to the server.
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| OnClientClosed |
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Occurs when a client disconnect from the server.
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| OnClientCommand |
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Clients connects to the server to send commands (also called requests) and wait for server responses.
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| OnClientTimeout |
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When a client had no more activity during some time specified by the ClientTimeout property, it is automatically disconnected. If this occurs, the OnClientTimeout event is triggred.
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| OnClientBgException |
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Client communication is handled by a TWSocket descendent component which works in the background.
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| OnDisplay |
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Sometimes, the server can display some infos about his internal working.
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| OnServerBgException |
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The OnBgException event is triggered when an exception occurs in the background (occuring in an event handler called from the message pump).
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How to
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