MACROMEDIA FLASH MEDIA SERVER 2-SERVER-SIDE ACTIONSCRIPT LANGUAGE Manuale Utente Scaricare il pdf (Pagina 80)

80 Deploying Flash Media Server

Once you have defined such a mapping, you can use the symbol in one of the XML

configuration files.

To use a symbol in place of a normal string in a configuration file, specify the symbol name,

with the characters

${ before the symbol name, and } after the symbol name. Whenever the

server finds something of the form

${SYMBOL}, it performs a lookup to see if the symbol is

mapped to a string. If no mapping is found, then

${SYMBOL} is not substituted, and is taken

literally. Otherwise, it is substituted.

For example, in the Vhost.xml file, you might use the previously defined symbol as follows:

</VirtualDir>

</VirtualHost>

When the server encounters the symbol, it checks whether the symbol named VIR_DIR is

mapped to anything. It then finds that it is mapped to

c:\streams in the substitution.xml

file. The symbolic mapping in the previous XML fragment is equivalent to the following

XML without symbols:

<Streams>foo;c:\streams</Streams>

</VirtualDir>

</VirtualHost>

If the substitution.xml file is missing and you try to use text substitution symbols in the

configuration files, the server will interpret the symbols as literal strings.

Predefined symbols

The two predefined symbols ROOT and CONF do not need to be mapped, and are always

available. The

ROOT symbol is mapped to the location of the FMSMaster.exe file, as this

example shows:

<AppsDir>${ROOT}\..\..\myapps</AppsDir>

The CONF symbol is mapped to the location of the Server.xml file, as this example shows:

<AppsDir>${CONF}\..\yourapps</AppsDir>

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MACROMEDIA FLASH MEDIA SERVER 2-SERVER-SIDE ACTIONSCRIPT LANGUAGE Manuale Utente Pagina 80