beverage-machine

Library that implements functionality of beverage machine.

Problem description can be found in Link

Design philosophy:

Build pluggable modules for maximum reuse and extensibility of code.

Build N outlet dispensing module with bare metal beverage machine. This machine only has connection point for pluggable brewing machines.
Build brewing machines which has connection point pluggable ingredient containers.
Build pluggable ingredient containers.
Interconnect N outlet dispensing machine with brewing machine and connect the brewing machine with ingredient containers to build a beverage brewing machine.
Build custom brewing machine with more more than one brewing module by interconnecting N outlet dispensing machine with mutliple brewing machine and connect these brewing machines with a set of required ingredient containers to dispense multiple beverages to N people paralelly.

The modular design will look like this:

Structure of the code:

With code modularity and its reuse and extensibility in mind, I built the complete system in the form of inter pluggable component. First step started with the drawing of sketch of the functionality offered by a beverage machine and that became the part of beverage machine interface - BeverageMachine.

Using this the first module was brought into existence which had N outlets with bare metal feature of a pluggable beverage machine - BaseBeverageMachine

Then we finalized on functionality of an pluggable ingredient container by building an interface - IngredientContainer. Then we built ConcreteIngredientContainer on the interface to provide a common container for all ingredients.

Then we build core concrete brewing machines using N-outlet bare metal beverage machine multiple ingredient containers as per need. For example -

Now we build a custom beverage machine, "Chai point Machine", which serves -

hot water
hot milk
green tea
ginger tea
elaichi tea
hot coffee

Since we have already built systems which serves us all the above beverages separately. So we will inject brewing modules of - HotWaterMachine, HotMilkMachine GreenTeaMachine GingerTeaMachine ElaichiTeaMachine CoffeMachine into ChaipointBeverage machine and plug ingredient containers for - water,milk,green mixture,tea leaves syrup, ginger syrup,elaichi syrup, coffee syrup,sugar syrup. Hence constructing a custom beverage machine using injection of modules.

BeverageComposition is the recipe book of a beverage and tells quantity of ingredients needed to prepare a particular beverage. So there are will a beverageComposition instance for green tea, there can be a different beverage composition for hot coffee, a different beverage composition for chai point's green tea.

BeverageType enumerates all the type of beverages supported by our library. If we want to add a new beverage, this will be the starting point where we will add an enum for the corresponding beverage type.

IngredientType enumerates all the types of ingredient supported by our library which serves as the ingredients to prepare a beverage. The ingredient types are -

water
milk
green mixture
tea leaves syrup
elaichi syrup
ginger syrup
coffee syrup

Class diagram:

Functional Testing "Test-Coverage":

Testing is done by reading input_test.json and testing all beverage machine classes using the data in this file. The file looks like:

{
  "machine": {
    "outlets": {
      "count_n": 3
    },
    "total_items_quantity": {
      "hot_water": 500,
      "hot_milk": 500,
      "ginger_syrup": 100,
      "sugar_syrup": 100,
      "tea_leaves_syrup": 100
    },
    "beverages": {
      "ginger_tea": {
        "hot_water": 200,
        "hot_milk": 100,
        "ginger_syrup": 10,
        "sugar_syrup": 10,
        "tea_leaves_syrup": 30
      },
      "hot_coffee": {
        "hot_water": 100,
        "hot_milk": 400,
        "sugar_syrup": 50,
        "coffee_syrup": 30
      },
      "elaichi_tea": {
        "hot_water": 300,
        "hot_milk": 100,
        "sugar_syrup": 50,
        "tea_leaves_syrup": 30,
        "elaichi_syrup": 30
      },
      "green_tea": {
        "hot_water": 100,
        "ginger_syrup": 30,
        "sugar_syrup": 50,
        "green_mixture": 30
      },
      "hot_water" : {
        "water" : 50
      },
      "hot_milk" : {
        "milk" : 50
      }
    }
  }
}

The testing is done using Junit and coverage report is generated using Jacoco.

Report:

How to run test and generate report

Using git and maven:

git clone git@github.com:maskofG/beverage-machine.git
cd beverage-machine
mvn clean
mvn test
(now check index.html in target/test-coverage-report/ directory generated by jacoco plugin)

Downloading and then using maven:

wget https://github.com/maskofG/beverage-machine/archive/master.zip;
unzip beverage-machine-master.zip
cd beverage-machine
mvn clean
mvn test