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‎.editorconfig‎

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[*]
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charset = utf-8
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end_of_line = lf
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indent_size = 2
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indent_style = space
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insert_final_newline = false
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max_line_length = 120
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tab_width = 2
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ij_continuation_indent_size = 2
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ij_formatter_off_tag = @formatter:off
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ij_formatter_on_tag = @formatter:on
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ij_formatter_tags_enabled = true
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ij_smart_tabs = false
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ij_visual_guides =
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ij_wrap_on_typing = false

‎.github/workflows/build.yaml‎

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name: Build
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on:
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- push
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- pull_request
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jobs:
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build:
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runs-on: ubuntu-latest
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steps:
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- name: Check out
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uses: actions/checkout@v4
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- name: Set up Java
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uses: actions/setup-java@v4
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with:
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java-version: 25
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distribution: temurin
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cache: maven
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- name: Build
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run: mvn -B package --file pom.xml

‎.gitignore‎

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HELP.md
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### STS ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/

‎README.md‎

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# Spring Boot DDD Sample
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[![Build](https://github.com/mtamme/spring-boot-ddd-sample/actions/workflows/build.yaml/badge.svg)](https://github.com/mtamme/spring-boot-ddd-sample/actions/workflows/build.yaml)
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This is the sample bounded context from the [<CODE/CRAFTS>](https://code-crafts.com) conference
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workshop [From Strategy to Tactics – Kickstart Your DDD Journey Collaboratively](https://2025.code-crafts.com/workshop-from-strategy-to-tactics).
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## Usage
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### Requires
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- Java 25
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- Maven 3.9+
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### Build
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```
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$ mvn clean package
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```

‎booking/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.github</groupId>
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<artifactId>spring-boot-ddd-sample</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<artifactId>booking</artifactId>
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<dependencies>
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<!-- Spring -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-actuator</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-jpa</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-flyway</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-validation</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<!-- Springdoc -->
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<dependency>
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<groupId>org.springdoc</groupId>
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<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
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</dependency>
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<!-- Swagger -->
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<dependency>
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<groupId>io.swagger.core.v3</groupId>
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<artifactId>swagger-annotations</artifactId>
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</dependency>
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<!-- H2 -->
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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<scope>runtime</scope>
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</dependency>
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<!-- Seedwork -->
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<dependency>
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<groupId>com.github</groupId>
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<artifactId>seedwork</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</dependency>
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<!-- Test -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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</dependency>
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<dependency>
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<groupId>com.tngtech.archunit</groupId>
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<artifactId>archunit</artifactId>
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</dependency>
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<dependency>
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<groupId>com.tngtech.archunit</groupId>
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<artifactId>archunit-junit5</artifactId>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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</plugin>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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<plugin>
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<groupId>org.openapitools</groupId>
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<artifactId>openapi-generator-maven-plugin</artifactId>
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<executions>
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<execution>
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<goals>
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<goal>generate</goal>
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</goals>
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<configuration>
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<inputSpec>${project.basedir}/src/main/resources/static/booking-openapi.yaml</inputSpec>
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<apiPackage>com.github.booking.infrastructure.web</apiPackage>
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<modelPackage>com.github.booking.infrastructure.web.representation</modelPackage>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎booking/src/main/java/com/github/booking/Main.java‎

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package com.github.booking;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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public class Main {
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static void main(final String[] args) {
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SpringApplication.run(Main.class, args);
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}
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}

‎booking/src/main/java/com/github/booking/application/booking/BookingCommandHandler.java‎

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package com.github.booking.application.booking;
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import com.github.booking.application.booking.command.CancelBookingCommand;
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import com.github.booking.application.booking.command.ConfirmBookingCommand;
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import com.github.booking.application.booking.command.InitiateBookingCommand;
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import com.github.booking.application.booking.command.InitiateBookingResult;
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import com.github.booking.application.booking.command.ReleaseSeatCommand;
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import com.github.booking.application.booking.command.ReserveSeatCommand;
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import org.springframework.transaction.annotation.Transactional;
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@Transactional
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public interface BookingCommandHandler {
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InitiateBookingResult initiateBooking(InitiateBookingCommand command);
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void reserveSeat(ReserveSeatCommand command);
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void releaseSeat(ReleaseSeatCommand command);
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void confirmBooking(ConfirmBookingCommand command);
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void cancelBooking(CancelBookingCommand command);
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}

‎booking/src/main/java/com/github/booking/application/booking/BookingCommandHandlerImpl.java‎

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package com.github.booking.application.booking;
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import com.github.booking.application.booking.command.CancelBookingCommand;
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import com.github.booking.application.booking.command.ConfirmBookingCommand;
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import com.github.booking.application.booking.command.InitiateBookingCommand;
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import com.github.booking.application.booking.command.InitiateBookingResult;
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import com.github.booking.application.booking.command.ReleaseSeatCommand;
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import com.github.booking.application.booking.command.ReserveSeatCommand;
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import com.github.booking.domain.booking.BookingException;
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import com.github.booking.domain.booking.BookingId;
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import com.github.booking.domain.booking.BookingRepository;
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import com.github.booking.domain.hall.SeatNumber;
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import com.github.booking.domain.show.ShowException;
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import com.github.booking.domain.show.ShowId;
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import com.github.booking.domain.show.ShowRepository;
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import org.springframework.stereotype.Service;
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import java.util.Objects;
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@Service
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public class BookingCommandHandlerImpl implements BookingCommandHandler {
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private final BookingRepository bookingRepository;
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private final ShowRepository showRepository;
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public BookingCommandHandlerImpl(final BookingRepository bookingRepository, final ShowRepository showRepository) {
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this.bookingRepository = Objects.requireNonNull(bookingRepository);
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this.showRepository = Objects.requireNonNull(showRepository);
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}
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@Override
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public InitiateBookingResult initiateBooking(final InitiateBookingCommand command) {
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final var show = showRepository.findByShowId(new ShowId(command.showId()))
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.orElseThrow(ShowException::notFound);
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final var booking = show.initiateBooking(bookingRepository.nextBookingId());
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bookingRepository.save(booking);
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return new InitiateBookingResult(booking.bookingId()
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.value());
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}
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@Override
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public void reserveSeat(final ReserveSeatCommand command) {
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final var booking = bookingRepository.findByBookingId(new BookingId(command.bookingId()))
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.orElseThrow(BookingException::notFound);
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final var show = showRepository.findByShowId(booking.showId())
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.orElseThrow(ShowException::notFound);
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show.reserveSeat(booking, new SeatNumber(command.seatNumber()));
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showRepository.save(show);
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}
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@Override
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public void releaseSeat(final ReleaseSeatCommand command) {
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final var booking = bookingRepository.findByBookingId(new BookingId(command.bookingId()))
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.orElseThrow(BookingException::notFound);
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final var show = showRepository.findByShowId(booking.showId())
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.orElseThrow(ShowException::notFound);
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show.releaseSeat(booking, new SeatNumber(command.seatNumber()));
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showRepository.save(show);
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}
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@Override
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public void confirmBooking(final ConfirmBookingCommand command) {
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final var booking = bookingRepository.findByBookingId(new BookingId(command.bookingId()))
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.orElseThrow(BookingException::notFound);
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booking.confirm();
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bookingRepository.save(booking);
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}
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@Override
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public void cancelBooking(final CancelBookingCommand command) {
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final var booking = bookingRepository.findByBookingId(new BookingId(command.bookingId()))
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.orElseThrow(BookingException::notFound);
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booking.cancel();
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bookingRepository.save(booking);
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}
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}

‎booking/src/main/java/com/github/booking/application/booking/BookingQueryHandler.java‎

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package com.github.booking.application.booking;
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import com.github.booking.application.booking.query.BookingDetailView;
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import com.github.booking.application.booking.query.BookingSummaryView;
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import com.github.booking.application.booking.query.GetBookingQuery;
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import com.github.booking.application.booking.query.ListBookingsQuery;
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import org.springframework.transaction.annotation.Transactional;
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import java.util.List;
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@Transactional(readOnly = true)
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public interface BookingQueryHandler {
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BookingDetailView getBooking(GetBookingQuery query);
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List<BookingSummaryView> listBookings(ListBookingsQuery query);
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}

‎booking/src/main/java/com/github/booking/application/booking/command/CancelBookingCommand.java‎

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package com.github.booking.application.booking.command;
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public record CancelBookingCommand(String bookingId) {
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}

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