Our code predates Rete.setMark(), etc., so we use bsave and bload to
save state and backtrack. Will be interested to hear your results with
setMark(), in particular w.r.t. whether the agenda is restored to its
previous state. Thanks,
Jonathan
On 12/1/2008 12:46 PM, Jason Morris wrote:
Hi All,
One convenient architecture for controlling processes in Jess is to
create one or more components whose sole purpose is to abstract the
interaction with the rule engine (Rete object). This abstraction I
like to call a RuleEngineManager. The RuleEngineManager is a facade to
the Rete object, which allows for the application programmer to command
the application in domain specific terminology which wraps the
appropriate underlying Jess API code.
The process flow is something like this:
1. The user interacts with the application.
2. The application interacts with the RuleEngineManager.
3. The RuleEngineManager delegates to helpers such as a:
- WorkingMemoryManager: Manages the high-level working memory
processes such as initialization, rollback, and queries.
- RuleManager: Manages the loading and unloading of rule modules
and focus stack.
4. The delegate performs the assigned task, executing a callback if
necessary.
In the application that I'm currently coding, we have need to rollback
the working memory to a previous state when certain conditions arise.
Of course, Jess provides the WorkingMemoryMarker class and its methods
to provide the State object.
To implement the actual stack of working memory markers in the
WorkingMemoryManager, I've decided to use the org.apache.commons.collections.map.LinkedMap
, which allows me to label the markers and keep them in sequential
order.
I thought I'd pass this along as a tip and ask the general question:
Has any one else used this or a similar architectural approach; and, if
so, how did you tackle it?
Cheers,
Jason
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