Implement video like command

src/mooc/main/tv/codely/mooc/notification/application/like/SendPushToSubscribersOnVideoLiked.java

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+package tv.codely.mooc.notification.application.like;
+
+import tv.codely.mooc.video.domain.VideoLiked;
+import tv.codely.shared.application.DomainEventSubscriber;
+
+public class SendPushToSubscribersOnVideoLiked implements DomainEventSubscriber<VideoLiked> {
+    @Override
+    public Class<VideoLiked> subscribedTo() {
+        return VideoLiked.class;
+    }
+
+    @Override
+    public void consume(VideoLiked event) {
+        System.out.println(
+            String.format(
+                "Hey! User with ID <%s> liked video with title <%s>",
+                event.userId(),
+                event.title()
+            )
+        );
+    }
+}

src/mooc/main/tv/codely/mooc/shared/domain/user/UserId.java

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+package tv.codely.mooc.shared.domain.user;
+
+public final class UserId {
+    private final String value;
+
+    public UserId(final String value) {
+        this.value = value;
+    }
+
+    public String value() {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        UserId that = (UserId) o;
+
+        return value.equals(that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return value.hashCode();
+    }
+}

src/mooc/main/tv/codely/mooc/video/application/like/VideoLiker.java

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+package tv.codely.mooc.video.application.like;
+
+import tv.codely.mooc.shared.domain.user.UserId;
+import tv.codely.mooc.video.domain.VideoLike;
+import tv.codely.mooc.video.domain.VideoTitle;
+import tv.codely.shared.domain.EventBus;
+
+public final class VideoLiker {
+    private final EventBus eventBus;
+
+    public VideoLiker(EventBus eventBus) {
+        this.eventBus = eventBus;
+    }
+
+    public void like(String rawTitle, String rawUserId) {
+        final var title = new VideoTitle(rawTitle);
+        final var userId = new UserId(rawUserId);
+
+        final var videoLike = VideoLike.like(title, userId);
+
+        eventBus.publish(videoLike.pullDomainEvents());
+    }
+}

src/mooc/main/tv/codely/mooc/video/domain/VideoLike.java

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+package tv.codely.mooc.video.domain;
+
+import tv.codely.mooc.shared.domain.user.UserId;
+import tv.codely.shared.domain.AggregateRoot;
+
+public class VideoLike extends AggregateRoot {
+    private final VideoTitle title;
+    private final UserId userId;
+
+    private VideoLike(VideoTitle title, UserId userId) {
+        this.title = title;
+        this.userId = userId;
+    }
+
+    public static VideoLike like(VideoTitle title, UserId userId) {
+        var videoLike = new VideoLike(title, userId);
+
+        var videoLiked = new VideoLiked(title.value(), userId.value());
+
+        videoLike.record(videoLiked);
+
+        return videoLike;
+    }
+
+}

src/mooc/main/tv/codely/mooc/video/domain/VideoLiked.java

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+package tv.codely.mooc.video.domain;
+
+import tv.codely.shared.domain.DomainEvent;
+
+public final class VideoLiked implements DomainEvent {
+    private static final String FULL_QUALIFIED_EVENT_NAME = "codelytv.video.video.event.1.video.liked";
+
+    private final String title;
+    private final String userId;
+
+    public VideoLiked(String title, String userId) {
+        this.title = title;
+        this.userId = userId;
+    }
+
+    public String fullQualifiedEventName() {
+        return FULL_QUALIFIED_EVENT_NAME;
+    }
+
+    public String title() {
+        return title;
+    }
+
+    public String userId() {
+        return userId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        VideoLiked that = (VideoLiked) o;
+
+        if (!title.equals(that.title)) return false;
+        return userId.equals(that.userId);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = title.hashCode();
+        result = 31 * result + userId.hashCode();
+        return result;
+    }
+}

src/mooc/main/tv/codely/mooc/video/infrastructure/VideoLikeCliController.java

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+package tv.codely.mooc.video.infrastructure;
+
+import tv.codely.mooc.notification.application.like.SendPushToSubscribersOnVideoLiked;
+import tv.codely.mooc.video.application.like.VideoLiker;
+import tv.codely.shared.application.DomainEventSubscriber;
+import tv.codely.shared.domain.EventBus;
+import tv.codely.shared.infrastructure.bus.ReactorEventBus;
+
+import java.util.Set;
+
+public class VideoLikeCliController {
+    public static void main(String[] args) {
+        final Set<DomainEventSubscriber> subscribers = Set.of(
+            new SendPushToSubscribersOnVideoLiked()
+        );
+        final EventBus eventBus = new ReactorEventBus(subscribers);
+        final var videoLiker = new VideoLiker(eventBus);
+
+        final var videoTitle = "\uD83C\uDF89 New YouTube.com/CodelyTV video title";
+        final var userId = "06e8bb44-486c-41ec-8395-ead1288e5b37";
+
+        videoLiker.like(videoTitle, userId);
+    }
+}

src/mooc/test/tv/codely/mooc/video/application/like/VideoLikerShould.java

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+package tv.codely.mooc.video.application.like;
+
+import org.junit.jupiter.api.Test;
+import tv.codely.mooc.video.domain.VideoLiked;
+import tv.codely.shared.domain.EventBus;
+
+import java.util.List;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+
+final class VideoLikerShould {
+    @Test
+    void publish_the_video_liked_domain_event() {
+        final EventBus eventBus = mock(EventBus.class);
+        final var videoLiker = new VideoLiker(eventBus);
+
+        final var videoTitle = "\uD83C\uDF89 New YouTube.com/CodelyTV video title";
+        final var userId = "This should be the video description \uD83D\uDE42";
+
+        videoLiker.like(videoTitle, userId);
+
+        final var expectedVideoLiked = new VideoLiked(videoTitle, userId);
+
+        verify(eventBus).publish(List.of(expectedVideoLiked));
+    }
+
+}