MACROMEDIA FLASH MEDIA SERVER 2-MANAGING FLASH MEDIA..., Руководство пользователя

Страница: 225 / 238

Access DLL 225
Access DLL is the
libconnect.dll
file (this module is named the
libconnect.so
file in
Linux installations) stored within the modules/access subdirectory of the root Flash Media
Server installation.
When a connection is attempted, Flash Media Server first determines whether or not Access
DLL exists.
■
If the Access module is available, the module is initialized on server startup with a context
pointer. The module also provides an adaptor interface to the server. Together, the context
pointer and adaptor pointer provide for two-way communications between the access
module and the main server. This context pointer can be used to gather server statistics.
■
If the Access module is not available, all connection requests proceed as usual. The
connection is accepted pending resources and valid application name.
Configuring Access DLL
The Flash Media Server administrator can configure how the Access DLL module handles
connection requests for the server’s resources. When the connection request from a client is
first attempted, the Access module intercepts the request before sending it to the server. The
Access DLL module calls upon its APIs to examine the information contained within the
connection request and authorizes or rejects the connection request.
The Access module uses the following APIs to examine the request:
■
The connection request activates the
onAccess
callback function within the Access
module.
■
The
setValue
function determines which field to examine and authenticate.
■
You select this field when you configure the
setValue
API.
■
The Access DLL module makes the value defined by the
setValue
function available to
the
getValue
API.
■
The
getValue
function returns the value found in the predefined field of the connection
message.
■
The
OnAccess
function accepts or rejects the connection.
■
The
getStats
function collects server statistics from the context pointer.
When you configure this module, you can use the sample DLL authentication supplied by
Macromedia or apply your own authentication mechanism to intercept and examine
connection attempts to Flash Media Server.