Re: [jboss-as7-dev] DMR GWT Prototype

From: "Jason T. Greene" <jason.greene(a)redhat.com&gt; To: jboss-as7-dev(a)lists.jboss.org Sent: Wednesday, February 9, 2011 11:08:58 PM Subject: [jboss-as7-dev] DMR GWT Prototype I was able to port DMR so that it can be used with GWT to send and receive DMR's native externalized binary format via client-side javascript. https://github.com/n1hility/jboss-as/tree/detyped2 A pure binary protocol is not possible in all browsers, so the implementation has to base64 encode the stream. The main advantage to this approach is that there is essentially no loss of information (all type info is preserved), and the API works very well at dynamic access and is exactly the same as the management API used in server code. In addition parsing requests on the server is much more efficient since there is less transformation and pattern matching. Lastly it has the potential to be much more space efficient. However, due to Javascript's very poor binary handling, lack of streaming, and lack of native floating point encoding, client side execution is on average 2x+ slower than directly evaling JSON code. That said, processing a dump of the entire model took on average 9ms (in webkit based browsers), and in the worst case (firefox) took 20ms. So the times are still somewhat reasonable.

In addition to being faster on the client side, eval'd JSON does not require maintaining the DMR API. On the other hand JSON usage in GWT is clumsy if you aren't using overlay types, and overlay types are not helpful to dynamic client code (dynamic as in being able to discover and manage resources based on resource descriptions as opposed to static code). Lastly, JSON output, by its nature, loses type information. Although this could be worked around if it's a problem by adding type identifiers to all node values, at the cost of looking less JSON like (extra verbose). So ultimately it's up to everyone working on the console as to which direction this goes. I can easily support both mechanisms on the server. -- Jason T. Greene JBoss, a division of Red Hat _______________________________________________ jboss-as7-dev mailing list jboss-as7-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-as7-dev