Acquiring Content to Pre-Position
Now that you've learned how to set up a location tree, you can pre-position content to the CEs located within the tree, so that the tree can provide content to the
The type of content determines the protocols that you can use to fetch the content, which are as
Keep in mind that the protocols used to acquire the content into the ACNS network need not be the same as those used by clients for viewing or downloading the content. For example, the acquirer can use FTP to pull Apple QuickTime streaming files from an FTP server, whereas clients can use their Apple media player to view the content using RTSP and RTP.
You can configure content acquisition using either the CDM GUI or with external manifest files.
Configuring Acquisition Using Manifest Files
You should use manifest files if you have content developers in your organization who would like to specify what content to preposition to the ACNS network from their
The manifest file instructs the root CE for the channel to pull either individual items of content or to crawl through entire directories of content. You write manifest files in XML using tags specific to ACNS acquisition. Example 14-1 gives a sample manifest file for acquiring content in an ACNS network.
Example 14-1. Sample Manifest File
You can use the following tags in your manifest file:
Refer to your ACNS documentation for the XML schema that outlines the entire manifest XML file specification.
Figure 14-10 shows how to assign the manifest file to a channel.
Figure 14-10. Assigning a Manifest File to a Channel
Configuring Acquisition Using the CDM GUI
The CDM GUI enables you, as an ACNS administrator, to configure content acquisition directly by creating Quick Crawl Filters, as Figure 14-11 illustrates.
Figure 14-11. Configuring Content Acquisition from the CDM GUI