Business rule engine which would fullfill most common usecases in Salesforce

Building a business rule engine requires a lot of planning and consideration of different use cases. Below is an example of how to implement a simple business rule engine in Salesforce that fulfills common use cases: First, we need to define the rules in a way that can be easily configured and maintained. We can use custom metadata types to store the rules and their associated actions. Each rule will have a set of conditions that must be met, and an action that should be performed when the conditions are true. Next, we need to create a trigger that will evaluate the rules when records are created or updated. This trigger will loop through all the rules and check if the conditions for each rule are met. If the conditions are met, the trigger will execute the associated action for that rule. Here's an example code for the trigger:

	trigger BusinessRuleTrigger on Account (before insert, before update) {
	for (Business_Rule__mdt rule : [SELECT Id, Conditions__c, Action__c FROM Business_Rule__mdt]) {
	if (evaluateConditions(rule.Conditions__c)) {
	executeAction(rule.Action__c, Trigger.new);
	}
	}
	}
	public static boolean evaluateConditions(String conditions) {
	// parse the conditions and evaluate them
	return true; // return true if the conditions are met
	}
	public static void executeAction(String action, List<Account> accounts) {
	// perform the specified action on the accounts
	}

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The Business_Rule__mdt custom metadata type will store the rules and their associated actions. It will have two fields, Conditions__c and Action__c, which will contain the conditions and actions for each rule. The evaluateConditions method will parse the conditions and evaluate them based on the data in the records. The exact implementation will depend on the format of the conditions. The executeAction method will perform the specified action on the records that meet the conditions. The exact implementation will depend on the actions that are defined. With this basic framework in place, we can add more complex functionality as needed, such as support for different types of conditions and actions, the ability to chain rules together, and the ability to specify rule priority.