The key for the algorithm configuration parameter is RuleSession. Also, there is a configuration parameter: RuleSession. It is a boolean.
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The default is true. Setting it to false informs the rule engine that error suppression will not be enabled. In this case, an attempt to enable error suppression will throw an exception.
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This setting allows the Non-Rete algorithm to realize additional heap savings. It is common that multiple rulesets are executed during a rule execution. It is also common that each ruleset is pushed onto the ruleset stack once and after rules in that ruleset have completed firing, it is not pushed onto the stack again during that rule execution. With the Non-Rete algorithm, additional performance gain can be realized for these cases by specifying that the rulesets will only appear on the stack once.
This setting can be set and queried with the RL built in functions:. Here are some key points about the new algorithm: Simpler internal rule representation. This is a preview of subscription content, log in to check access. Transactions on Parallel and Distributed Processing , 3 4 —, July Google Scholar. Alfred V. Aho, Ravi Sethi, and Jeffrey D. Compilers: Principles, Techniques, and Tools. Addison-Wesley Publishing Company, David Becker, Raj K. Singh, and G. In 29th Design Automation Conference , pages — Michael C.
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Muhich, and David P. The PowerPC Microprocessor. Thomas Cooper and Nancy Wogrin. Rule-based Programming with OPS5. Artificial Intelligence, Expert Systems. Morgan Kaufmann Publishers, Inc. Charles L. On the Efficient Implementation of Production Systems. Artificial Intelligence, 19 , September Rajesh K.
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Dr. Forgy's PhD thesis in chapter by chapter PDF | Planet JBoss Developer
Computer Architecture a quantitative Approach. Morgan Kaufmann Publisher, Bruce K. The root node is where all objects enter the network. From there, it immediately goes to the ObjectTypeNode. The purpose of the ObjectTypeNode is to make sure the engine doesn't do more work than it needs to. For example, say we have 2 objects: Account and Order. If the rule engine tried to evaluate every single node against every object, it would waste a lot of cycles.
To make things efficient, the engine should only pass the object to the nodes that match the object type. The easiest way to do this is to create an ObjectTypeNode and have all 1-input and 2-input nodes descend from it. This way, if an application asserts a new account, it won't propogate to the nodes for the Order object. In Drools when an object is asserted it retrieves a list of valid ObjectTypesNodes via a lookup in a HashMap from the object's Class; if this list doesn't exist it scans all the ObjectTypde nodes finding valid matches which it caches in the list.
This enables Drools to match against any Class type that matches with an instanceof check. AlphaNodes are used to evaluate literal conditions. Although the paper only covers equality conditions, many RETE implementations support other operations.
Origin of the Rete Algorithm
For example, Account. When a rule has multiple literal conditions for a single object type, they are linked together. This means that if an application asserts an account object, it must first satisfy the first literal condition before it can proceed to the next AlphaNode. Forgy's paper, he refers to these as IntraElement conditions.
When a new instance enters the ObjectTypde node, rather than propagating to each AlphaNode, it can instead retrieve the correct AlphaNode from the HashMap - avoiding unecessary literal checks.
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