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Proxy and Facade design pattern
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‎facade/build.gradle‎

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plugins {
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id 'java'
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}
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group 'org.example'
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version '1.0-SNAPSHOT'
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repositories {
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mavenCentral()
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}
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dependencies {
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testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.0'
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testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.0'
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}
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test {
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useJUnitPlatform()
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}

‎facade/gradle/wrapper/gradle-wrapper.properties‎

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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists

‎facade/gradlew‎

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‎facade/gradlew.bat‎

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‎facade/settings.gradle‎

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rootProject.name = 'facade'
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‎facade/src/main/java/DeliveryBoy.java‎

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public class DeliveryBoy {
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public void pickUpOrder() {
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}
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public void deliverOrder() {
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}
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}

‎facade/src/main/java/DeliveryTeam.java‎

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public class DeliveryTeam {
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public void assignDeliveryBoy() {
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}
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}

‎facade/src/main/java/Main.java‎

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/**
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* Facade pattern : This is also a structural pattern where it defines how classes needs to be structured in a way that
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* for complex functionalities there is single entry point to that function.
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* We should use facade pattern when we have complex subsystems , calling each leads to a single operation for client.
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* In this case we should introduce facade which helps to do interaction with all this subsystem and gives us single output,
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* Facade pattern basically adds one level of abstractions in the system.
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*
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* To implement facade you have to write one class which interacts with other services in down stream.
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*
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* Consider example you have to place order in the zomato and you want to get food
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* 1. Customer sees menu and place order
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* 2. Restaurant got this order and prepare order
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* 3. Delivery team assigns delivery person
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* 4. Delivery boy picks up order and deliver.
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*
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* Here Zomato api is facade for us where we just clicked place order and it done. Think to get food
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* after placing order you have to call restaurant to prepare order and give it to delivery boy.
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*
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* https://www.decipherzone.com/blog-detail/facade-design-pattern
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*/
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public class Main {
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}

‎facade/src/main/java/Restaurant.java‎

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public class Restaurant {
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public void prepareOrder() {
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}
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}

‎facade/src/main/java/ZomatoFacade.java‎

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public class ZomatoFacade {
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private Restaurant restaurant;
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private DeliveryBoy deliveryBoy;
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private DeliveryTeam deliveryTeam;
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public void placeOrder() {
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restaurant.prepareOrder();
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deliveryTeam.assignDeliveryBoy();
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deliveryBoy.pickUpOrder();
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deliveryBoy.deliverOrder();
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}
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}

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