9:21 a.m.
I don't understand the garbage collection mechanism in drool, though I have
read the expert documentation.
1 - how to retract a global variable in drool?
2 - how to retract all the facts that have been inserted into the working
memory? If I use halt(), does it retract all facts in the working memory and
stop the all the rules?
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3:44 p.m.
On 1 March 2012 16:21, shawn <youngxiao121(a)hotmail.com> wrote:
I don't understand the garbage collection mechanism in drool,
though I have
read the expert documentation.
There is no specific "garbage collection" by Drools - Java's GC does
the
trick.
1 - how to retract a global variable in drool?
You don't "retract", you can set it to null, same way as set to an
object.
2 - how to retract all the facts that have been inserted into the
working
memory?
Several ways, simple is to use KnowledgeSession's getFactHandles, and
retract them.
Or dispose the entire Session, and create another one, which might be
faster.
If I use halt(), does it retract all facts in the working memory and
stop the all the rules?
No. Yes.
-W
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4:10 p.m.
Thank you very much~
1- You don't "retract", you can set it to null, same way as set to an
object.
Is it in java or in drool? If I understand correct, global variable is not
really inserted into the working memory,right? Global just ensure drool can
see the variable?
2-Several ways, simple is to use KnowledgeSession's getFactHandles, and
retract them. Or dispose the entire Session, and create another one, which
might be faster.
You mean the working memory belongs to the Session not knowledgeBase?
Because I have to keep the knowledgebase running all the time, I have to
ensure each fire() don't leave any useless facts in the working memeory.
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4:14 p.m.
On 1 March 2012 23:10, shawn <youngxiao121(a)hotmail.com> wrote:
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Thank you very much~
1- You don't "retract", you can set it to null, same way as set to an
object.
Is it in java or in drool?
...? It's a Java object, made visible to DRL code.
If I understand correct, global variable is not
really inserted into the working memory,right?
Yes.
Global just ensure drool can
see the variable?
Yes.
2-Several ways, simple is to use KnowledgeSession's
getFactHandles, and
retract them. Or dispose the entire Session, and create another one, which
might be faster.
You mean the working memory belongs to the Session not knowledgeBase?
Yes.
Because I have to keep the knowledgebase running all the time, I have
to
ensure each fire() don't leave any useless facts in the working memeory.
Now you know how to.
-W
4:22 p.m.
Thanks a lot.
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Wolfgang Laun