Description

The URLResourceReader is an implementation of ResourceReader which is included in the DDF Catalog. It obtains a resource given an http, https, or file-based URL.

The URLResourceReader will connect to the provided Resource URL and read the resource's bytes into an InputStream.

Usage

URLResourceReader will be used by the Catalog Framework to obtain a resource whose Metacard is cataloged in the local data store. This particular ResourceReader will be chosen by the CatalogFramework if the requested resource's URL has a protocol of http, https, or file.

For example, requesting a resource with the following URL will make the Catalog Framework invoke the URLResourceReader to retrieve the product.

Example

file:///home/users/ddf_user/data/example.txt

If a resource was requested with the URL udp://123.45.67.89:80/SampleResourceStream, the URLResourceReader would not be invoked.

Installation and Uninstallation

URLResourceReader is installed by default with the DDF Catalog.

Configuration

This URLResourceReader has no configurable properties. It can only be installed or uninstalled.

Implementation Details

Supported Schemes

http
https
file

If a file-based URL is passed to the URLResourceReader, that file path needs to be accessible by the DDF instance.

Known Issues

None

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