feat: issue ticket for a booked seat

Author: mtamme

booking/src/main/java/com/github/booking/application/ticket/TicketCommandHandler.java

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+package com.github.booking.application.ticket;
+
+import com.github.booking.application.ticket.command.RedeemTicketCommand;
+import org.springframework.transaction.annotation.Transactional;
+
+@Transactional
+public interface TicketCommandHandler {
+
+  void redeemTicket(RedeemTicketCommand command);
+}

booking/src/main/java/com/github/booking/application/ticket/TicketCommandHandlerImpl.java

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+package com.github.booking.application.ticket;
+
+import com.github.booking.application.ticket.command.RedeemTicketCommand;
+import com.github.booking.domain.ticket.TicketException;
+import com.github.booking.domain.ticket.TicketId;
+import com.github.booking.domain.ticket.TicketRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.Objects;
+
+@Service
+public class TicketCommandHandlerImpl implements TicketCommandHandler {
+
+  private final TicketRepository ticketRepository;
+
+  public TicketCommandHandlerImpl(final TicketRepository ticketRepository) {
+    this.ticketRepository = Objects.requireNonNull(ticketRepository);
+  }
+
+  @Override
+  public void redeemTicket(final RedeemTicketCommand command) {
+    final var ticket = ticketRepository.findByTicketId(new TicketId(command.ticketId()))
+      .orElseThrow(TicketException::notFound);
+
+    ticket.redeem();
+    ticketRepository.save(ticket);
+  }
+}

booking/src/main/java/com/github/booking/application/ticket/TicketEventHandler.java

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+package com.github.booking.application.ticket;
+
+import com.github.booking.domain.show.SeatBooked;
+import com.github.booking.domain.show.ShowException;
+import com.github.booking.domain.show.ShowRepository;
+import com.github.booking.domain.ticket.TicketRepository;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Objects;
+
+@Service
+@Transactional
+public class TicketEventHandler {
+
+  private final TicketRepository ticketRepository;
+  private final ShowRepository showRepository;
+
+  public TicketEventHandler(final TicketRepository ticketRepository, final ShowRepository showRepository) {
+    this.ticketRepository = Objects.requireNonNull(ticketRepository);
+    this.showRepository = Objects.requireNonNull(showRepository);
+  }
+
+  @EventListener
+  public void onSeatBooked(final SeatBooked event) {
+    final var show = showRepository.findByShowId(event.showId())
+      .orElseThrow(ShowException::notFound);
+    final var ticket = show.issueTicket(ticketRepository.nextTicketId(), event.seatNumber());
+
+    ticketRepository.save(ticket);
+  }
+}

booking/src/main/java/com/github/booking/application/ticket/TicketQueryHandler.java

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+package com.github.booking.application.ticket;
+
+import com.github.booking.application.ticket.query.GetTicketQuery;
+import com.github.booking.application.ticket.query.ListTicketsQuery;
+import com.github.booking.application.ticket.query.TicketDetailView;
+import com.github.booking.application.ticket.query.TicketSummaryView;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Transactional(readOnly = true)
+public interface TicketQueryHandler {
+
+  TicketDetailView getTicket(GetTicketQuery query);
+
+  List<TicketSummaryView> listTickets(ListTicketsQuery query);
+}

booking/src/main/java/com/github/booking/application/ticket/command/RedeemTicketCommand.java

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+package com.github.booking.application.ticket.command;
+
+public record RedeemTicketCommand(String ticketId) {
+}

booking/src/main/java/com/github/booking/application/ticket/query/GetTicketQuery.java

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+package com.github.booking.application.ticket.query;
+
+public record GetTicketQuery(String ticketId) {
+}

booking/src/main/java/com/github/booking/application/ticket/query/ListTicketsQuery.java

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+package com.github.booking.application.ticket.query;
+
+public record ListTicketsQuery(long offset, int limit) {
+}

booking/src/main/java/com/github/booking/application/ticket/query/SeatAssignmentView.java

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+package com.github.booking.application.ticket.query;
+
+import java.time.Instant;
+
+public record SeatAssignmentView(String movieTitle,
+                                 String hallName,
+                                 Instant scheduledAt,
+                                 String seatNumber) {
+
+  public static SeatAssignmentView of(final String movieTitle,
+                                      final String hallName,
+                                      final Instant scheduledAt,
+                                      final String seatNumber) {
+    return new SeatAssignmentView(movieTitle, hallName, scheduledAt, seatNumber);
+  }
+}

booking/src/main/java/com/github/booking/application/ticket/query/TicketBookingView.java

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+package com.github.booking.application.ticket.query;
+
+public record TicketBookingView(String bookingId, String status) {
+
+  public static TicketBookingView of(final String bookingId, final String status) {
+    if (bookingId == null) {
+      return null;
+    }
+
+    return new TicketBookingView(bookingId, status);
+  }
+}

booking/src/main/java/com/github/booking/application/ticket/query/TicketDetailView.java

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+package com.github.booking.application.ticket.query;
+
+import java.time.Instant;
+
+public record TicketDetailView(String ticketId,
+                               String status,
+                               TicketBookingView booking,
+                               SeatAssignmentView seatAssignment) {
+
+  public TicketDetailView(final String ticketId,
+                          final String status,
+                          final String bookingId,
+                          final String bookingStatus,
+                          final String seatAssignmentMovieTitle,
+                          final String seatAssignmentHallName,
+                          final Instant seatAssignmentScheduledAt,
+                          final String seatAssignmentSeatNumber) {
+    this(
+      ticketId,
+      status,
+      TicketBookingView.of(bookingId, bookingStatus),
+      SeatAssignmentView.of(seatAssignmentMovieTitle, seatAssignmentHallName, seatAssignmentScheduledAt, seatAssignmentSeatNumber));
+  }
+}