Specifies the cache prefix that is passed from the origin server to the edge server.

This element is set on the origin server. The edge server uses the value of this element as a relative path to locate the cache file defined in the CacheDir element.

The type attribute provides additional specification for the cache prefix. The type attribute can be set to path or sname. The default is path.

Examples

<CachePrefix type="path"></CachePrefix> 

When the attribute type is path, the server appends the physical path of the recorded stream to the prefix.

<CachePrefix type="sname"></CachePrefix> 

When the attribute type is sname, the server appends the stream name to the prefix.

The cache prefix is any text with or without preset parameters. The prefix can be any name without special characters, such as \, :, *, ?, ", <, >, |. All parameters are surrounded by ?. The server substitutes the actual names for everything specified within the ?.

By default, the prefix is set to ?IP?

You can include the IP address in the prefix to avoid file collision. For example, the edge server might be connecting to two different origin servers with the same file in c:\data\foo.flv. Adding the IP to the prefix for these files points each file to the appropriate server.

If you want more than one origin server to share the cache file, do not include the IP as a parameter. Remember the cache prefix is a relative path used by the edge server to look up the cache stream file.

Examples

The cache prefix creates a relative path in the edge's CacheDir. All parameters are separated by \ or /.

<CachePrefix type="path">c:\fms\flvs\foo.flv. data/?IP?</CacheDir>

resolves to:

data/xxx.xxx.xxx.xxx/c/fms/flvs/foo.flv
<CachePrefix type="path">?APPINST?/data</CacheDir>

resolves to:

app1/inst1/data/c/fms/flvs/foo.flv 
<CachePrefix type="path">origin1/data/</CacheDir>

resolves to:

origin1/data/c/fms/flvs/foo.flv

See also

StorageDir, DuplicateDir, CacheUpdateInterval