When you execute rules in an embedded environment, you deploy and execute a ruleset archive on a single Java Virtual Machine (JVM).

You include the rule engine in the class path of the application. In the application, you use the JRules API to load a ruleset, instantiate a rule engine, and execute the rule engine against objects passed as parameters.

The rule engine is a component for executing rules. It uses a ruleset and a group of objects or ruleset parameters to evaluate what rules need to be fired. Firing a rule means executing the action part of the rule in the context of the objects that have satisfied its conditions.

Step 1 of this graphic shows that the rule engine is based on pattern matching: it matches rule conditions with a group of objects or ruleset parameters.

In step 2, the rule engine creates a rule instance for each match between a rule and an object or ruleset parameter. Depending on the algorithm used by the rule engine, or execution mode, the way the rule instances are fired varies.

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