Midware TClientWSocket

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Overview

unit

ApSrvCli.pas

TClientWSocket is a specialized TWSocket used to handle client connection with application server. A new TClientWSocket is instanciated by TAppServer when a client connect to the server. TClientWSocket is destroyed after client disconnect.

Do not confuse TClientWSocket with TAppSrvClient which is the client application side. TClientWSocket is used on the server side to handle client connections, TAppSrvClient is used on the client side to connect to the application server. Both components are talking to each other.

User code in an ordinary application server never create a TClientWSocket instance. Instead, it uses instances created by TAppServer and accessed thru his ClientWSocket indexed property or thru reference passed by events such as OnClientCommand.

Properties

Banner		The banner to be sent to the client upon connection. Must be a single line.
Busy		Busy is TRUE while a the previous request is still executing.
CommandCount		Number of commands issued by the client. Useful for statistics or accounting purposes.
CommandTimeout		Timeout value.
ConnectedSince		Gives the time when the client connected.
HSocket		HSocket is the underlaying winsock DLL handle for the connection handled by TClientWSocket component.
LastCommandTime		Gives the time of the last command received from client.
LocalPort		LocalPort gives the port number (or service name) associated by winsock on the local computer for the connection made by client.
PeerAddr		Store the client's IP address.
RcvBuf		The actual buffer used to store incomming data.
RcvdCount		Returns the number of characters received and not yet read.
RcvSize		Size of buffer used to receive commands (requests).
RcvSizeInc		When RcvBuf is too small, it will be enlarged by RcvSizeInc bytes automatically until RcvSizeMax is reached.
RcvSizeMax		When RcvBuf is too small, it will be enlarged by RcvSizeInc bytes automatically until RcvSizeMax is reached.
ReplyHeader		ReplyHeader point to the header built by the TAppServer based on reply status.
ReplyheaderLen		ReplyHeaderLen is the length in byte for the header.
ReplyBody		ReplyBody point to the answer to be sent to the client.
ReplyBodyLen		ReplyBodyLen is the length in bytes for the answer.
UserData		UserData is not used by the component nor the TAppServer component.

Methods

CheckCommandTimeout		Procedure used by TAppServer to check for inactivity timeout.
Dup		Dup associate a winsock handle to a TClientWSocket component.
GetPeerAddr
SendReply		SendReply procedure will send ReplyHeader and About MidWare followed by a CR/LF pair.
StartConnection		First method to be invoked on client connection.

Events

OnBgException		A background exception is an exception that occurs in the middle of nowhere.
OnCommand		Triggered when a client request (command) has been received.
OnDisplay		Triggered when the component wants to display something on the user interface.
OnOverflow		Triggered when the input buffer is overflowed and can't be enlarged.
OnSessionClosed		Occurs when client disconnect from server or has been disconnected.
OnTimeout		Triggered when the client timedout as is about to be disconnected by TAppServer.

How to

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