Use of decision node

A decision node is used to guide the process running path. This means you can tell the workflow which way should go. Decision criteria can be specified as follows:

• Adding conditions to transitions or BeanShell script which returns a boolean. Nodes go across its transitions examining the conditions until found the first one which match a criteria.

• Creating a class which implements the DecisionHandler interface. The decide method returns the transition to follow.

Below we are going to create a process containing a decision node which implements the DecisionHandler interface to decide the next node in the workflow.

public class ValorAction implements ActionHandler {
    public String value;

    @Override
    public void execute(ExecutionContext executionContext) throws Exception {
        executionContext.getContextInstance().setVariable("value", value);
    }
}

public class MyDecision implements DecisionHandler {
    public MyDecision(String info) {
        super();
    }

    @Override
    public String decide(ExecutionContext executionContext) throws Exception {
        String value = (String)executionContext.getContextInstance().getVariable("value");

        if(valor != null) {
            return "trans_1";
        } else {
            return "trans_2";
        }
    }
}

public class ShowMessageAction implements ActionHandler {
    public ShowMessageAction(String info) {
        super();
    }

    @Override
    public void execute(ExecutionContext executionContext) throws Exception {
        System.out.println("Flow go to node: " + executionContext.getNode().getName());
    }
}