Clean up Transaction Script
This commit is contained in:
Ilkka Seppälä
@ -0,0 +1,145 @@
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
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||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.transactionscript;
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import java.util.List;
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import javax.sql.DataSource;
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import org.h2.jdbcx.JdbcDataSource;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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/**
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* Transaction Script (TS) is one of the simplest domain logic pattern.
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* It needs less work to implement than other domain logic patterns and therefore
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* it’s perfect fit for smaller applications that don't need big architecture behind them.
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*
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* <p>In this example we will use the TS pattern to implement booking and cancellation
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* methods for a Hotel management App. The main method will initialise an instance of
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* {@link Hotel} and add rooms to it. After that it will book and cancel a couple of rooms
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* and that will be printed by the logger.</p>
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*
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* <p>The thing we have to note here is that all the operations related to booking or cancelling
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* a room like checking the database if the room exists, checking the booking status or the
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* room, calculating refund price are all clubbed inside a single transaction script method.</p>
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*/
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public class App {
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private static final String H2_DB_URL = "jdbc:h2:~/test";
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private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
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/**
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* Program entry point.
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* Initialises an instance of Hotel and adds rooms to it.
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* Carries out booking and cancel booking transactions.
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* @param args command line arguments
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* @throws Exception if any error occurs
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*/
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public static void main(String[] args) throws Exception {
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final var dataSource = createDataSource();
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deleteSchema(dataSource);
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createSchema(dataSource);
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final var dao = new HotelDaoImpl(dataSource);
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// Add rooms
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addRooms(dao);
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// Print room booking status
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getRoomStatus(dao);
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var hotel = new Hotel(dao);
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// Book rooms
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hotel.bookRoom(1);
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hotel.bookRoom(2);
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hotel.bookRoom(3);
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hotel.bookRoom(4);
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hotel.bookRoom(5);
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hotel.bookRoom(6);
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// Cancel booking for a few rooms
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hotel.cancelRoomBooking(1);
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hotel.cancelRoomBooking(3);
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hotel.cancelRoomBooking(5);
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getRoomStatus(dao);
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deleteSchema(dataSource);
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}
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private static void getRoomStatus(HotelDaoImpl dao) throws Exception {
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try (var customerStream = dao.getAll()) {
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customerStream.forEach((customer) -> LOGGER.info(customer.toString()));
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}
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}
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private static void deleteSchema(DataSource dataSource) throws java.sql.SQLException {
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try (var connection = dataSource.getConnection();
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var statement = connection.createStatement()) {
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statement.execute(RoomSchemaSql.DELETE_SCHEMA_SQL);
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}
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}
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private static void createSchema(DataSource dataSource) throws Exception {
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try (var connection = dataSource.getConnection();
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var statement = connection.createStatement()) {
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statement.execute(RoomSchemaSql.CREATE_SCHEMA_SQL);
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} catch (Exception e) {
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throw new Exception(e.getMessage(), e);
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}
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}
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/**
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* Get database.
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*
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* @return h2 datasource
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*/
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private static DataSource createDataSource() {
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var dataSource = new JdbcDataSource();
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dataSource.setUrl(H2_DB_URL);
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return dataSource;
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}
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private static void addRooms(HotelDaoImpl hotelDao) throws Exception {
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for (var room : generateSampleRooms()) {
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hotelDao.add(room);
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}
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}
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/**
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* Generate rooms.
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*
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* @return list of rooms
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*/
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private static List<Room> generateSampleRooms() {
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final var room1 = new Room(1, "Single", 50, false);
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final var room2 = new Room(2, "Double", 80, false);
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final var room3 = new Room(3, "Queen", 120, false);
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final var room4 = new Room(4, "King", 150, false);
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final var room5 = new Room(5, "Single", 50, false);
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final var room6 = new Room(6, "Double", 80, false);
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return List.of(room1, room2, room3, room4, room5, room6);
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}
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}
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@ -0,0 +1,87 @@
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.transactionscript;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class Hotel {
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private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
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private final HotelDaoImpl hotelDao;
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public Hotel(HotelDaoImpl hotelDao) {
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this.hotelDao = hotelDao;
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}
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/**
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* Book a room.
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*
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* @param roomNumber room to book
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* @throws Exception if any error
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*/
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public void bookRoom(int roomNumber) throws Exception {
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var room = hotelDao.getById(roomNumber);
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if (room.isEmpty()) {
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throw new Exception("Room number: " + roomNumber + " does not exist");
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} else {
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if (room.get().isBooked()) {
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throw new Exception("Room already booked!");
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} else {
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var updateRoomBooking = room.get();
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updateRoomBooking.setBooked(true);
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hotelDao.update(updateRoomBooking);
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}
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}
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}
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/**
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* Cancel a room booking.
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*
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* @param roomNumber room to cancel booking
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* @throws Exception if any error
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*/
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public void cancelRoomBooking(int roomNumber) throws Exception {
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var room = hotelDao.getById(roomNumber);
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if (room.isEmpty()) {
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throw new Exception("Room number: " + roomNumber + " does not exist");
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} else {
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if (room.get().isBooked()) {
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var updateRoomBooking = room.get();
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updateRoomBooking.setBooked(false);
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int refundAmount = updateRoomBooking.getPrice();
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hotelDao.update(updateRoomBooking);
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LOGGER.info("Booking cancelled for room number: " + roomNumber);
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LOGGER.info(refundAmount + " is refunded");
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} else {
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throw new Exception("No booking for the room exists");
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}
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}
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}
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}
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@ -0,0 +1,40 @@
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.transactionscript;
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import java.util.Optional;
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import java.util.stream.Stream;
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public interface HotelDao {
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Stream<Room> getAll() throws Exception;
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Optional<Room> getById(int id) throws Exception;
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Boolean add(Room room) throws Exception;
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Boolean update(Room room) throws Exception;
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Boolean delete(Room room) throws Exception;
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}
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@ -0,0 +1,172 @@
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/*
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* The MIT License
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* Copyright © 2014-2019 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
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* THE SOFTWARE.
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*/
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package com.iluwatar.transactionscript;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.util.Optional;
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import java.util.Spliterator;
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import java.util.Spliterators;
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import java.util.function.Consumer;
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import java.util.stream.Stream;
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import java.util.stream.StreamSupport;
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import javax.sql.DataSource;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class HotelDaoImpl implements HotelDao {
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private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
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private final DataSource dataSource;
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public HotelDaoImpl(DataSource dataSource) {
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this.dataSource = dataSource;
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}
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@Override
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public Stream<Room> getAll() throws Exception {
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try {
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var connection = getConnection();
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var statement = connection.prepareStatement("SELECT * FROM ROOMS");
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var resultSet = statement.executeQuery(); // NOSONAR
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return StreamSupport.stream(new Spliterators.AbstractSpliterator<Room>(Long.MAX_VALUE,
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Spliterator.ORDERED) {
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@Override
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public boolean tryAdvance(Consumer<? super Room> action) {
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try {
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if (!resultSet.next()) {
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return false;
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}
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action.accept(createRoom(resultSet));
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return true;
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} catch (Exception e) {
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throw new RuntimeException(e); // NOSONAR
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}
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}
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}, false).onClose(() -> {
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try {
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mutedClose(connection, statement, resultSet);
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} catch (Exception e) {
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LOGGER.error(e.getMessage());
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}
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});
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} catch (Exception e) {
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throw new Exception(e.getMessage(), e);
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}
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}
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@Override
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public Optional<Room> getById(int id) throws Exception {
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ResultSet resultSet = null;
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try (var connection = getConnection();
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var statement = connection.prepareStatement("SELECT * FROM ROOMS WHERE ID = ?")) {
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statement.setInt(1, id);
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resultSet = statement.executeQuery();
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if (resultSet.next()) {
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return Optional.of(createRoom(resultSet));
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} else {
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return Optional.empty();
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}
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} catch (Exception e) {
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throw new Exception(e.getMessage(), e);
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} finally {
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if (resultSet != null) {
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resultSet.close();
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}
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}
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}
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@Override
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public Boolean add(Room room) throws Exception {
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if (getById(room.getId()).isPresent()) {
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return false;
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}
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try (var connection = getConnection();
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var statement = connection.prepareStatement("INSERT INTO ROOMS VALUES (?,?,?,?)")) {
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statement.setInt(1, room.getId());
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statement.setString(2, room.getRoomType());
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statement.setInt(3, room.getPrice());
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statement.setBoolean(4, room.isBooked());
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statement.execute();
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return true;
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} catch (Exception e) {
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throw new Exception(e.getMessage(), e);
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}
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}
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@Override
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public Boolean update(Room room) throws Exception {
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try (var connection = getConnection();
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var statement =
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connection
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.prepareStatement("UPDATE ROOMS SET ROOM_TYPE = ?, PRICE = ?, BOOKED = ?"
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+ " WHERE ID = ?")) {
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statement.setString(1, room.getRoomType());
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statement.setInt(2, room.getPrice());
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statement.setBoolean(3, room.isBooked());
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statement.setInt(4, room.getId());
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return statement.executeUpdate() > 0;
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} catch (Exception e) {
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throw new Exception(e.getMessage(), e);
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}
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}
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@Override
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public Boolean delete(Room room) throws Exception {
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try (var connection = getConnection();
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var statement = connection.prepareStatement("DELETE FROM ROOMS WHERE ID = ?")) {
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statement.setInt(1, room.getId());
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return statement.executeUpdate() > 0;
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} catch (Exception e) {
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throw new Exception(e.getMessage(), e);
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}
|
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}
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|
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private Connection getConnection() throws Exception {
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return dataSource.getConnection();
|
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}
|
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private void mutedClose(Connection connection, PreparedStatement statement, ResultSet resultSet)
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throws Exception {
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try {
|
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resultSet.close();
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statement.close();
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connection.close();
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} catch (Exception e) {
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throw new Exception(e.getMessage(), e);
|
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}
|
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}
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private Room createRoom(ResultSet resultSet) throws Exception {
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return new Room(resultSet.getInt("ID"),
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resultSet.getString("ROOM_TYPE"),
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resultSet.getInt("PRICE"),
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resultSet.getBoolean("BOOKED"));
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}
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}
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@ -0,0 +1,123 @@
|
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/*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2019 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package com.iluwatar.transactionscript;
|
||||
|
||||
/**
|
||||
* A room POJO that represents the data that will be read from the data source.
|
||||
*/
|
||||
public class Room {
|
||||
|
||||
private int id;
|
||||
private String roomType;
|
||||
private int price;
|
||||
private boolean booked;
|
||||
|
||||
/**
|
||||
* Create an instance of room.
|
||||
* @param id room id
|
||||
* @param roomType room type
|
||||
* @param price room price
|
||||
* @param booked room booking status
|
||||
*/
|
||||
public Room(int id, String roomType, int price, boolean booked) {
|
||||
this.id = id;
|
||||
this.roomType = roomType;
|
||||
this.price = price;
|
||||
this.booked = booked;
|
||||
}
|
||||
|
||||
public int getId() {
|
||||
return id;
|
||||
}
|
||||
|
||||
public void setId(int id) {
|
||||
this.id = id;
|
||||
}
|
||||
|
||||
public String getRoomType() {
|
||||
return roomType;
|
||||
}
|
||||
|
||||
public void setRoomType(String roomType) {
|
||||
this.roomType = roomType;
|
||||
}
|
||||
|
||||
public int getPrice() {
|
||||
return price;
|
||||
}
|
||||
|
||||
public void setPrice(int price) {
|
||||
this.price = price;
|
||||
}
|
||||
|
||||
public boolean isBooked() {
|
||||
return booked;
|
||||
}
|
||||
|
||||
public void setBooked(boolean booked) {
|
||||
this.booked = booked;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean equals(Object o) {
|
||||
if (this == o) {
|
||||
return true;
|
||||
}
|
||||
if (o == null || getClass() != o.getClass()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
Room room = (Room) o;
|
||||
|
||||
if (id != room.id) {
|
||||
return false;
|
||||
}
|
||||
if (price != room.price) {
|
||||
return false;
|
||||
}
|
||||
if (booked != room.booked) {
|
||||
return false;
|
||||
}
|
||||
return roomType.equals(room.roomType);
|
||||
}
|
||||
|
||||
@Override
|
||||
public int hashCode() {
|
||||
int result = id;
|
||||
result = 31 * result + roomType.hashCode();
|
||||
result = 31 * result + price;
|
||||
result = 31 * result + (booked ? 1 : 0);
|
||||
return result;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
return "Room{"
|
||||
+ "id=" + id
|
||||
+ ", roomType=" + roomType
|
||||
+ ", price=" + price
|
||||
+ ", booked=" + booked
|
||||
+ '}';
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,38 @@
|
||||
/*
|
||||
* The MIT License
|
||||
* Copyright © 2014-2019 Ilkka Seppälä
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package com.iluwatar.transactionscript;
|
||||
|
||||
/**
|
||||
* Customer Schema SQL Class.
|
||||
*/
|
||||
public final class RoomSchemaSql {
|
||||
|
||||
public static final String CREATE_SCHEMA_SQL =
|
||||
"CREATE TABLE ROOMS (ID NUMBER, ROOM_TYPE VARCHAR(100), PRICE INT(100), BOOKED VARCHAR(100))";
|
||||
public static final String DELETE_SCHEMA_SQL = "DROP TABLE ROOMS IF EXISTS";
|
||||
|
||||
private RoomSchemaSql() {
|
||||
}
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user