Examples of org.drools.spi.KnowledgeHelper

org.drools.spi.KnowledgeHelper
KnowledgeHelper implementation types are injected into consequenses instrumented at compile time and instances passed at runtime. It provides convenience methods for users to interact with the WorkingMemory.
Of particular interest is the modifyObject method as it allows an object to be modified without having to specify the facthandle, because they are not passed to the consequence at runtime. To achieve this the implementation will need to lookup the fact handle of the object form the WorkingMemory. @author bob mcwhirter @author mark proctor

        List list = new  ArrayList();
        wm.setGlobal( "list", list );     
        
        ((MVELAction) actionNode.getAction().getMetaData("Action")).compile( Thread.currentThread().getContextClassLoader() );
        
        KnowledgeHelper knowledgeHelper = new DefaultKnowledgeHelper();
        ((Action) actionNode.getAction().getMetaData("Action")).execute( knowledgeHelper, wm, null );
        
        assertEquals("hello world", list.get(0) );
    }

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        final WorkingMemory wm = ruleBase.newStatefulSession();


        List list = new  ArrayList();
        wm.setGlobal( "list", list );        
        
        KnowledgeHelper knowledgeHelper = new DefaultKnowledgeHelper();
        ((MVELAction) actionNode.getAction().getMetaData("Action")).compile( Thread.currentThread().getContextClassLoader() );
        ((Action)actionNode.getAction().getMetaData("Action")).execute( knowledgeHelper, wm, null );
        
        assertEquals("hello world", list.get(0) );
    }

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        final WorkingMemory wm = ruleBase.newStatefulSession();


        List list = new  ArrayList();
        wm.setGlobal( "list", list );        
        
        KnowledgeHelper knowledgeHelper = new DefaultKnowledgeHelper();
        ((Action) actionNode.getAction().getMetaData("Action")).execute( knowledgeHelper, wm, null );
       
        assertEquals("hello world", list.get(0) );
    }

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    public int doAfter(Object value,
                       ASTNode node,
                       VariableResolverFactory factory) {
        DroolsMVELKnowledgeHelper resolver = (DroolsMVELKnowledgeHelper) factory.getVariableResolver( "drools" );
        KnowledgeHelper helper = (KnowledgeHelper) resolver.getValue();
        helper.update( value );
        return 0;
    }

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    if (extendedNode == null) {
      return;
    }
    List<DroolsAction> actions = extendedNode.getActions(type);
    if (actions != null) {
      KnowledgeHelper knowledgeHelper = createKnowledgeHelper();
      for (DroolsAction droolsAction: actions) {
        executeAction(droolsAction, knowledgeHelper);
      }
    }
  }

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      }
    }
  }
  
  protected KnowledgeHelper createKnowledgeHelper() {
    KnowledgeHelper knowledgeHelper = null;
    WorkingMemory workingMemory = ((ProcessInstance) getProcessInstance()).getWorkingMemory();
    if (((InternalRuleBase) workingMemory.getRuleBase()).getConfiguration().isSequential()) {
      knowledgeHelper = new SequentialKnowledgeHelper(workingMemory);
        } else {
          knowledgeHelper = new DefaultKnowledgeHelper(workingMemory);

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        df.setOtherVarsPos( otherVarsPos );
        df.setOtherVarsLength( otherVarsLength );
        
        if ( knowledgeHelper instanceof KnowledgeHelper ) {
            KnowledgeHelper kh = ( KnowledgeHelper ) knowledgeHelper;
            kh.setIdentityMap( identityMap );
            df.setKnowledgeHelper( kh );
        }        
    }

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        df.setOtherVarsPos( otherVarsPos );
        df.setOtherVarsLength( otherVarsLength );
        
        if ( knowledgeHelper != null && knowledgeHelper instanceof KnowledgeHelper ) {
            KnowledgeHelper kh = ( KnowledgeHelper ) knowledgeHelper;
            kh.setIdentityMap( identityMap );
            df.setKnowledgeHelper( kh );
        }        
    }

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    }
    
    private void triggerTimer(TimerInstance timerInstance) {
      for (Map.Entry<Timer, DroolsAction> entry: getEventBasedNode().getTimers().entrySet()) {
        if (entry.getKey().getId() == timerInstance.getTimerId()) {
          KnowledgeHelper knowledgeHelper = createKnowledgeHelper();
          executeAction(entry.getValue(), knowledgeHelper);
          return;
        }
      }
    }

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        df.setOtherVarsPos( otherVarsPos );
        df.setOtherVarsLength( otherVarsLength );
        
        if ( knowledgeHelper instanceof KnowledgeHelper ) {
            KnowledgeHelper kh = ( KnowledgeHelper ) knowledgeHelper;
            kh.setIdentityMap( identityMap );
            df.setKnowledgeHelper( kh );
        }        
    }

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Related Classes of org.drools.spi.KnowledgeHelper

org.drools.base.ModifyInterceptor

org.drools.base.mvel.MVELCompilationUnit

org.drools.factmodel.traits.TraitField

org.drools.process.instance.context.exception.DefaultExceptionScopeInstance

org.drools.rule.builder.dialect.java.JavaActionBuilderTest

org.drools.rule.builder.dialect.mvel.MVELActionBuilderTest

org.drools.rule.builder.dialect.mvel.MVELDecisionBuilderTest

org.drools.rule.builder.dialect.mvel.MVELDialect$ModifyInterceptor

org.drools.spring.pojorule.RuleReflectMethodTest

org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl

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