Actions

Actions can be used in different ways:

Actions have access to globals and the variables that are defined for the process and the predefined variable context. This variable is of type org.drools.runtime.process.ProcessContext and can be used for several tasks:

Drools currently supports two dialects, Java and MVEL. Java actions should be valid Java code. MVEL actions can use the business scripting language MVEL to express the action. MVEL accepts any valid Java code but additionally provides support for nested accesses of parameters (e.g., person.name instead of person.getName()), and many other scripting improvements. Thus, MVEL expressions are more convenient for the business user. For example, an action that prints out the name of the person in the "requester" variable of the process would look like this:

// Java dialect
System.out.println( person.getName() );

//  MVEL dialect
System.out.println( person.name );