Hey everyone - fairly new to the Restlet framework, but have found it quite valuable so far - thank you. I've been batting around an idea (explained below) and wanted to get a sound-off to see if my logic is heading in the right direction. Appreciate your input/insights.
Basically, I'm using Restlet to expose some functionality of a Java-native ontology inferencing library (Pellet) over HTTP as a RESTful API-style wrapper against biomedical concepts. We use this for a large number of activities such as text mining and data annotation, and the access to web-wrapped Pellet logic is useful, especially since we are largely a .NET shop. The Restlet service is built, stable, and running great. However, based on the server load at any time, the call may take a minute to compute (since inferencing is fairly computationally-intensive). Calls issued to a server in rapid succession can result in a long request queue. We have a number of resources running the service and with an extension I wrote with JGroups, can communicate with each other via UDP multicast. I was hoping I could use this mechanism to, should a server detect a large queue of requests, query the cluster of resources to find a node which has less work allocated to it, craft a 300 redirect based on the response it receives, and send it off to the client. The client would then re-issue the HTTP call to the server specified in the redirect. The logic seems fairly sound in my head, but a few questions remain: 1. Does the Restlet framework provide any way to access lower-level threading objects to "detect" how much of a work payload it currently has? 2. Is there some more obvious/less painful way (i.e. some Restlet extension) of doing this? Seems like all I would have to do is implement some functionality which is executed before the request is processed, determine if the request can be processed in a reasonable amount of time, and if not, find a node which does. Hoping someone with a greater knowledge of the inner workings of the Restlet framework would be able to provide some insight. Thanks for your time in advance. Regards, Tim ------------------------------------------------------ http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=2756181
