RulesEngine usecase examples

[abbasc52]

Starting this discussion to share usage examples for RulesEngine.
Please share how you are leveraging RulesEngine to solve various business problems.
This will enable community to understand different use-cases as well as the full potential of RulesEngine.

[renjthmails]

Hi Team,

Can we use this rule engine if the conditions are occurring at different point in time.
Consider the scenario where we need to respond with an action if 2 events are occurred.

The action should execute only if both the Events are occurred. eg: Event1, Event2
And assume that both of them happened in an interval of 10mins.

Thank You,
Renjith R

[shokri-navid]

I Want to have the list Contain method in my rule. for example, I need to check that my name property of the given object is among multiple options like ("tom", "jimmy", bob):

I tried it but the defined rule was not triggered on my object:

var rule = new Rule
{
    RuleName = "ExistIn",
    Enabled = true,
    Expression = "histack.Contains(Name)",
    RuleExpressionType = RuleExpressionType.LambdaExpression,
    SuccessEvent = "30",
    LocalParams = new List<ScopedParam>
    {
      new LocalParam
      {
          Name = "histack",
          Expression = "new List<string> {\"Tom\",\"Jimmy\", \"Bob\"}"
      }  
    },
    Actions = new RuleActions
    {
        OnSuccess = new ActionInfo
        {
            Name = "OutputExpression",
            Context = new Dictionary<string, object>
            {
                { "Expression", "\"hooray\"" }
            },
        }
    }
};

My object is like this:

var p = new Person{Name = "Bob"};

and I tried to apply rules by this code on my object:

var rules = new List<Rule>();
rules.Add(rule);
var workFlow = new Workflow();
workFlow.WorkflowName = "test";
workFlow.Rules = rules;

var ruleEngine = new RulesEngine.RulesEngine(new Workflow[]{workFlow}.ToArray());
    var t = await ruleEngine.ExecuteAllRulesAsync("test",
        new RuleParameter("item", p);
    t.OnSuccess(name =>
    {
       Console.WriteLine($"{name} Done!!!");
    });
}

[stephandeckers]

I have 2 concrete examples.

The first one is at a Telecom-company where the rulesengine is used to determine all the tasks to be executed outside in the field by a technician when a customer is connected. We have several rules in place taking arguments fed from the utility-registration system, the ruleengine then has a set of rules who inturn are related to some other classes returning json-structures holding information about the patches to be made outside.

The second one is at a logistics system where orders are incoming in a system and the ruleengine is used to ensure all the rules are met before an order can be processed.

In my experience, the rulesengine has quit a steep learning curve mostly because a lack of good examples and also because Chatgpt is not fully aware of it.