gerasalus [https://community.jboss.org/people/gerasalus] created the discussion
"Using drools in a web app is my approach correct" To view the discussion, visit: https://community.jboss.org/message/761632#761632 -------------------------------------------------------------- Hi all, some newbie questions. I'm wondering is my thinking and my architecture correct? Preconditions: 1. We have a set of rules stored in DB.Rules will be reloaded from DB only once a day 2. We have a set of meta-facts. Retrieval of those facts is expensive, and they only get updated once a day, after midnight - current meta-facts are immutable for a day. 3. We have user facts - some user specific data which we should be using together with meta-facts and producing output for specific user. 4. Our SLA is 150 req/s. Typical flow would be something like: we have rules together with meta facts. Along comes user with his general facts and request specific facts. For this input we run rules and produce results - calculate some data. Basically a typical quote calculation, just we are not calculating quotes :) Rules may change working memory (cart explosion pattern) So how would i make this work for multi user environment in a spring web apps? My ideas: 1. Create a custom Spring scope that will cache KnowledgeBase and invalidate it once it expires (at the beginning of new day) 2. Cache meta-facts (they are expensive to retrieve) for given time 3. For each user request (user comes in with its own facts) - create a new StatefulKnowledgeSession from existing KnowledgeBase byt inserting meta-facts and user specific facts and execute fireAllRules 4. Retrieve the result and dispose the StatefulKnowledgeSession() As i unserstand, if my rules are modifying working memory, i cannot reuse StatefulKnowledgeSession for different users (as they bring their own facts). Is there a better approach ? By reading forums and mailing lists i have mixed data about StatefulKnowledgeSession creation. There are threads that state cpu spikes while creating sessions. Maybe i should be considering pool of StatefulKnowledgeSession and inserting/retracing user facts while keeping meta-facts? Thanks! -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/761632#761632] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2034]
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