A generic framework that allows defining and evaluating rules for complex business scenarios.
Rules.Framework is a generic framework that allows defining and evaluating rules for complex business scenarios.
A rule is a data structure limited in time (date begin
and date end
), whose content is categorized by a content type
. Its applicability is constrained by conditions
, and a priority
value is used as untie criteria when there are multiple rules applicable.
By using rules, we're able to abstract a multiplicity of business scenarios through rules configurations, instead of heavy code developments. Rules enable a fast response to change and a better control of the business logic by the product owners.
Name | nuget.org | downloads | fuget.org |
---|---|---|---|
Rules.Framework | |||
Rules.Framework.Providers.MongoDB | |||
Rules.Framework.WebUI |
The Rules.Framework package contains the core of the rules engine. It includes an in-memory provider for the rules data source.
To set up a RulesEngine
, define the content types and condition types to be used.
enum ContentType { FreeSample = 1, ShippingCost = 2 }
enum ConditionType { ClientType = 1, Country = 2 }
Build the engine with the RulesEngineBuilder
.
var rulesEngine = RulesEngineBuilder.CreateRulesEngine()
.WithContentType<ContentType>()
.WithConditionType<ConditionType>()
.SetInMemoryDataSource()
.Configure(c => c.PriorityCriteria = PriorityCriterias.TopmostRuleWins)
.Build();
Use the RuleBuilder
to assemble a rule.
var ruleForPremiumFreeSample = RuleBuilder
.NewRule<ContentType, ConditionType>()
.WithName("Rule for perfume sample for premium clients.")
.WithContent(ContentType.FreeSample, "SmallPerfumeSample")
.WithCondition(ConditionType.ClientType, Operators.Equal, "Premium")
.WithDateBegin(new DateTime(2020, 01, 01))
.Build();
Add a rule to the engine with the AddRuleAsync()
.
rulesEngine.AddRuleAsync(ruleForPremiumFreeSample.Rule, RuleAddPriorityOption.ByPriorityNumber(1));
Get a matching rule by using the MatchOneAsync()
and passing a date and conditions.
var matchingRule = rulesEngine.MatchOneAsync(
ContentType.FreeSample,
new DateTime(2021, 12, 25),
new[]
{
new Condition<ConditionType>(ConditionType.ClientType, "Premium")
});
For a more thorough explanation of the Rules.Framework and all it enables, check the Wiki.
Check also the test scenarios and samples available within the source-code, to see more elaborated examples of its application.
To keep rules persisted in a MongoDB database, use the extension method in the Providers.MongoDB package to pass your MongoClient and MongoDbProviderSettings to the RulesEngineBuilder
.
var rulesEngine = RulesEngineBuilder.CreateRulesEngine()
.SetInMongoDBDataSource(mongoClient, mongoDbProviderSettings)
The WebUI package offers a way of visualizing the rules in your web service. To configure the UI, pass the rules engine as generic to the IApplicationBuilder
extension method provided.
app.UseRulesFrameworkWebUI(rulesEngine.CreateGenericEngine());
Access is done via the endpoint {host}/rules/index.html
.
The following list presents features already available and others planned:
See the Wiki for full documentation, short examples and other information.
Contributions are more than welcome! Submit comments, issues or pull requests, we promise to keep an eye on them :)
Head over to CONTRIBUTING for further details.