Hi Nick,
Nick Stuart wrote:
> Hi all! I am trying to setup a simple resource that will handle a 'long
> winded' request. Basically I want to do a 'PUT' to create something that
> takes a while to get going. I don't really care about the return codes
> or anything and don't want to wait till the entire reuqest is done. Is
> there a 'best practice' way of doing this? This will be executing out of
> another Servlet that does some stuff before hand and will need fire this
> request off as well once it is done.
>
> Any thoughts or ideas on this? Only thing I've seen
> that mentions this is
> at http://blogs.sun.com/sandoz/entry/jersey_client_api near the bottom, but its
> only put there as a quick idea/thought. Has anything else been done for
> this?
>
It was an idea of the general vision i want to head towards but i have
not currently had any time to pursue it.
Off the top of my head we could do something like this:
AsyncWebResource ar = client.asyncResource("
http://host/foo");
Future<String> fs = ar.put(String.class);
I don't think it is that hard to create a naive implementation that uses
a thread-per-request, but the vision goes further to utilize Grizzly to
get scalable services that are also clients of other services.
Ideally i wanted to reuse the WebResource iface but i cannot do:
WebResource a = client.resource("
http://host/foo");
Future<String> fs = ar.put(Future<String>.type);
but obviously that will not work :-) but there may be a way using the
the TypeLiteral class in Guice that Lars pointed me too (which
incidentally we are attempting to include in the 311 API) but from a
type safety perspective i am not sure it really improves things.
Note that an alternative way to manage long requests is for the service
to return immediately with a new URI that is a handle to the state of
processing (a ticket-based pattern), which is obviously more work for
both the client and service but can be the more appropriate thing to do
in certain cases (e.g. if processing state should be monitored by more
than one client, or it represents some form of transaction).
Paul.
[1]
http://google-guice.googlecode.com/svn/trunk/src/com/google/inject/TypeLiteral.java
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Paul Sandoz
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