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#1317 Special Case Pattern (#1624)

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* #1317 Add Special Case Pattern

To focus on pattern itself, I implement DB and
maintenance lock by the singleton instance.

* #1317 Add special cases unit tests

Assert the logger output
(ref: https://stackoverflow.com/a/52229629)

* #1317 Add README.md

Add Special Case Pattern README

* #1317 Format: add a new line to end of file

Co-authored-by: Subhrodip Mohanta <subhrodipmohanta@gmail.com>
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ignite1771
2021-01-13 15:36:21 +08:00
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parent bbc4fdfc24
commit dea7ecfb7a
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special-case/src/main/java/com/iluwatar/specialcase/App.java
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package com.iluwatar.specialcase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <p>The Special Case Pattern is a software design pattern that encapsulates particular cases
* into subclasses that provide special behaviors.</p>
*
* <p>In this example ({@link ReceiptViewModel}) encapsulates all particular cases.</p>
*/
public class App {
private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
/**
* Program entry point.
*/
public static void main(String[] args) {
// DB seeding
LOGGER.info("Db seeding: " + "1 user: {\"ignite1771\", amount = 1000.0}, "
+ "2 products: {\"computer\": price = 800.0, \"car\": price = 20000.0}");
Db.getInstance().seedUser("ignite1771", 1000.0);
Db.getInstance().seedItem("computer", 800.0);
Db.getInstance().seedItem("car", 20000.0);
final var applicationServices = new ApplicationServicesImpl();
ReceiptViewModel receipt;
LOGGER.info("[REQUEST] User: " + "abc123" + " buy product: " + "tv");
receipt = applicationServices.loggedInUserPurchase("abc123", "tv");
receipt.show();
MaintenanceLock.getInstance().setLock(false);
LOGGER.info("[REQUEST] User: " + "abc123" + " buy product: " + "tv");
receipt = applicationServices.loggedInUserPurchase("abc123", "tv");
receipt.show();
LOGGER.info("[REQUEST] User: " + "ignite1771" + " buy product: " + "tv");
receipt = applicationServices.loggedInUserPurchase("ignite1771", "tv");
receipt.show();
LOGGER.info("[REQUEST] User: " + "ignite1771" + " buy product: " + "car");
receipt = applicationServices.loggedInUserPurchase("ignite1771", "car");
receipt.show();
LOGGER.info("[REQUEST] User: " + "ignite1771" + " buy product: " + "computer");
receipt = applicationServices.loggedInUserPurchase("ignite1771", "computer");
receipt.show();
}
}