Grubbly/Kitchen-Chain-of-Responsibility

In order to make a dish, you have to use a number of appliances and tools to turn raw ingredients into something edible. Using the chain of responsibility design pattern, raw ingredients act as input, while appliances and tools that can handle the ingredient act as states. If an appliance can not or should not handle an ingredient, it passed on to the next state until it can be handled.

Kitchen-Chain-of-Responsibility

In order to make a dish, you have to use a number of appliances and tools to turn raw ingredients into something edible. Using the chain of responsibility design pattern, raw ingredients act as input, while appliances and tools that can handle the ingredient act as states. If an appliance can not or should not handle an ingredient, it is continuously passed on to the next appliance until it can be handled.

Step 1: Create a Kitchen

vector<shared_ptr<Dish>> kitchenTools = { make_shared<Oven>(), 
                                          make_shared<Spatula>(), 
                                          make_shared<Microwave>() };

Step 2: Chain The Kitchen Tools Together

if (kitchenTools.size() <= 0)
		throw exception("A dish must have at least 1 appliance or small kitchen tool!\n\n");

	Dish chainedDish(kitchenTools[0]);
	for (unsigned int toolNum = 1; toolNum < kitchenTools.size(); toolNum++)
		chainedDish.appendKitchenToolToChain(kitchenTools[toolNum]);

Step 3: Add Ingredients To The Dish

Dish mac = chainKitchenTools(kitchenTools);

mac.handleIngredient("boil", "water");
mac.handleIngredient("boil", "noodles in water");
mac.handleIngredient("drain", "noodles");
mac.handleIngredient("mix", "noodles and cheese");

Step 4: EAT 😄

Complete Process:

vector<shared_ptr<Dish>> kitchenTools = { make_shared<Oven>(), 
                                          make_shared<Spatula>(), 
                                          make_shared<Microwave>() };

if (kitchenTools.size() <= 0)
		throw exception("A dish must have at least 1 appliance or small kitchen tool!\n\n");

	Dish chainedDish(kitchenTools[0]);
	for (unsigned int toolNum = 1; toolNum < kitchenTools.size(); toolNum++)
		chainedDish.appendKitchenToolToChain(kitchenTools[toolNum]);

Dish mac = chainKitchenTools(kitchenTools);

mac.handleIngredient("boil", "water");
mac.handleIngredient("boil", "noodles in water");
mac.handleIngredient("drain", "noodles");
mac.handleIngredient("mix", "noodles and cheese");

//Mac & Cheese Complete!

Sample Output:

Resources

https://sourcemaking.com/design_patterns/chain_of_responsibility/cpp/1