Thx Sergey, that seems fine!
I'm trying using UriInfo injection and I'm trying to detect the case where I
must lock my resource.
I hope to get the {bookId} easily, but there is nothing into path parameters...
Normal?
I wrote something like:
@Override
public Response handleRequest(final Message m, final ClassResourceInfo
resourceClass) {
System.out.println("BookHandler.handleRequest: " + uriInfo.getPath());
if(uriInfo.getPath().contains("/books/")) {
final MultivaluedMap<String, String> pathParameters =
uriInfo.getPathParameters();
final Set<String> pathParameterNames = pathParameters.keySet();
for (final String pathParameterName : pathParameterNames) {
System.out.println(pathParameterName + " : " +
pathParameters.getFirst(pathParameterName));
}
}
return null;
}
-----Original Message-----
From: Sergey Beryozkin [mailto:[email protected]]
Sent: jeudi 5 juillet 2012 12:49
To: [email protected]
Cc: Muller, Anthony
Subject: Re: JAX-RS services - Interceptor
Hi Anthony
On 05/07/12 11:17, Muller, Anthony wrote:
> Hello,
>
> I have a use case when I need to intercept some REST calls to lock a used
> resource (underlying code doesn't support concurrent access). I wish to use
> an CXF interceptor to implement the lock mechanism (something else can help ?)
>
> Example of concurrent calls:
> Client 1 : [POST]<baseurl>/books/1234/chapters/ --> Book < 1234 > must be
> locked to avoid concurrent modifications
> Client 2 : [POST]<baseurl>/books/1234/chapters/56/paragraph --> Webservice
> must wait because book < 1234 > is currently locked
>
> So, I wish to add a CXF interceptor on URL starting by < /books/{bookId}/...
> >, but I don't see how can I do...
>
> (In my case, I can not use Servlet API...)
>
I think the simplest way is to create a class implementing both
RequestHandler and ResponseHandler interfaces and have a '@Context
UriInfo' injected (which is thread safe).
You can use UriInfo.getPath() method to get values like
'books/1234/chapters', etc. Perhaps, even simpler, is to do
RequestHandler'message.get(Message.REQUEST_URI)', where 'message' is of
type Message and is available as a method parameter.
This implementation will 'lock' by updating the concurrent cache of some
sort (Colm done few Ehcache based implementations in CXF for example) in
its handleRequest method and 'unlock' in its handleResponse if it is
'books/1234/chapters'. It can be registered as a jaxrs:provider
Hope that helps :-)
Sergey
> Can you help ?
>
> Thanks and regards,
> Anthony
>
