The ResourceEngine is used to create implementations
of the Resource interface that suit the targeted
resource. Different Resource objects may be needed to
handle different files/directories or even applications. The request
URI specified must be a HTTP request URI as of RFC 2616.
The meaning of HTTP URI in this instance is the request URI
from a HTTP/x.x request, as RFC 2616 and RFC 2396 defines it
Request-Line = Method SP Request-URI SP HTTP-Version CRLF
Request-URI = "*" | absoluteURI | abs_path | authority
absoluteURI = "http:" "//" host [":" port] [abs_path ["?" query]]
abs_path = "/" path_segments
path_segments = segment *( "/" segment )
The ResourceEngine object must be prepared to accept
the request URI that come in the form outlined above. These can
include formats like
http://some.host/pub;param=value/bin/index.html?name=value
http://some.host:8080/index.en_US.html
some.host:8080/index.html
/usr/bin;param=value/README.txt
/usr/bin/compress.tar.gz
The ResourceEngine implementation should be able to
directly take a Request-URI as defined in RFC 2616 and translate
this into a Resource. This keeps the objects semantics
simple and explicit, although at the expense of performance.
The Resource returned is an implementation of the
ProtocolHandler interface. Implementation's of this
can acquire the Resource based on the URI or query.
author:
Niall Gallagher |