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#1321 Added comments about TS

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This commit is contained in:
Ashish Trivedi 2020-08-11 00:21:46 +05:30
parent 75b10ed657
commit e99bcf772b
1 changed files with 20 additions and 1 deletions
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21
transaction-script/src/main/java/com/ashishtrivedi16/transactionscript/App.java
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@ -29,6 +29,20 @@ import org.h2.jdbcx.JdbcDataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Transaction Script (TS) is one of the simplest domain logic pattern.
* It needs less work to implement than other domain logic patterns and therefore
* it’s perfect fit for smaller applications that don't need big architecture behind them.
*
* <p>In this example we will use the TS pattern to implement booking and cancellation
* methods for a Hotel management App. The main method will initialise an instance of
* {@link Hotel} and add rooms to it. After that it will book and cancel a couple of rooms
* and that will be printed by the logger.</p>
*
* <p>The thing we have to note here is that all the operations related to booking or cancelling
* a room like checking the database if the room exists, checking the booking status or the
* room, calculating refund price are all clubbed inside a single transaction script method.</p>
*/
public class App {
private static final String H2_DB_URL = "jdbc:h2:~/test";
@ -36,7 +50,8 @@ public class App {
/**
* Program entry point.
*
* Initialises an instance of Hotel and adds rooms to it.
* Carries out booking and cancel booking transactions.
* @param args command line arguments
* @throws Exception if any error occurs
*/
@ -47,12 +62,15 @@ public class App {
createSchema(dataSource);
final var dao = new HotelDaoImpl(dataSource);
// Add rooms
addRooms(dao);
// Print room booking status
getRoomStatus(dao);
var hotel = new Hotel(dao);
// Book rooms
hotel.bookRoom(1);
hotel.bookRoom(2);
hotel.bookRoom(3);
@ -60,6 +78,7 @@ public class App {
hotel.bookRoom(5);
hotel.bookRoom(6);
// Cancel booking for a few rooms
hotel.cancelRoomBooking(1);
hotel.cancelRoomBooking(3);
hotel.cancelRoomBooking(5);