From: Kai Moritz <kai@juplo.de>
Date: Sun, 3 Sep 2023 17:49:59 +0000 (+0200)
Subject: refactor: Splitted `ChatRoomInfo` and `ChatRoomData` - Moved classes
X-Git-Tag: rebase--2024-02-03--15-10~39
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=fb9a6dd6f918d9b2f1ed4c5bb4b6cd2f609cf358;p=demos%2Fkafka%2Fchat

refactor: Splitted `ChatRoomInfo` and `ChatRoomData` - Moved classes
---

diff --git a/src/main/java/de/juplo/kafka/chat/backend/domain/ChatRoom.java b/src/main/java/de/juplo/kafka/chat/backend/domain/ChatRoom.java
deleted file mode 100644
index c66b887d..00000000
--- a/src/main/java/de/juplo/kafka/chat/backend/domain/ChatRoom.java
+++ /dev/null
@@ -1,118 +0,0 @@
-package de.juplo.kafka.chat.backend.domain;
-
-import lombok.extern.slf4j.Slf4j;
-import reactor.core.publisher.Flux;
-import reactor.core.publisher.Mono;
-import reactor.core.publisher.Sinks;
-import reactor.core.publisher.SynchronousSink;
-
-import java.time.Clock;
-import java.time.LocalDateTime;
-import java.util.*;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-
-@Slf4j
-public class ChatRoom extends ChatRoomInfo
-{
-  public final static Pattern VALID_USER = Pattern.compile("^[a-z0-9-]{2,}$");
-  private final Clock clock;
-  private final ChatRoomService service;
-  private final int bufferSize;
-  private Sinks.Many<Message> sink;
-
-
-  public ChatRoom(
-      UUID id,
-      String name,
-      Integer shard,
-      Clock clock,
-      ChatRoomService service,
-      int bufferSize)
-  {
-    super(id, name, shard);
-    log.info("Created ChatRoom {} with buffer-size {}", id, bufferSize);
-    this.clock = clock;
-    this.service = service;
-    this.bufferSize = bufferSize;
-    // @RequiredArgsConstructor unfortunately not possible, because
-    // the `bufferSize` is not set, if `createSink()` is called
-    // from the variable declaration!
-    this.sink = createSink();
-  }
-
-
-  synchronized public Mono<Message> addMessage(
-      Long id,
-      String user,
-      String text)
-  {
-    Matcher matcher = VALID_USER.matcher(user);
-    if (!matcher.matches())
-      throw new InvalidUsernameException(user);
-
-    Message.MessageKey key = Message.MessageKey.of(user, id);
-    return service
-        .getMessage(key)
-        .handle((Message existing, SynchronousSink<Message> sink) ->
-        {
-          if (existing.getMessageText().equals(text))
-          {
-            sink.next(existing);
-          }
-          else
-          {
-            sink.error(new MessageMutationException(existing, text));
-          }
-        })
-        .switchIfEmpty(
-            Mono
-                .defer(() -> service.persistMessage(key, LocalDateTime.now(clock), text))
-                .doOnNext(m ->
-                {
-                  Sinks.EmitResult result = sink.tryEmitNext(m);
-                  if (result.isFailure())
-                  {
-                    log.warn("Emitting of message failed with {} for {}", result.name(), m);
-                  }
-                }));
-  }
-
-
-  public ChatRoomService getChatRoomService()
-  {
-    return service;
-  }
-
-  public Mono<Message> getMessage(String username, Long messageId)
-  {
-    Message.MessageKey key = Message.MessageKey.of(username, messageId);
-    return service.getMessage(key);
-  }
-
-  synchronized public Flux<Message> listen()
-  {
-    return sink
-        .asFlux()
-        .doOnCancel(() -> sink = createSink()); // Sink hast to be recreated on auto-cancel!
-  }
-
-  public Flux<Message> getMessages()
-  {
-    return getMessages(0, Long.MAX_VALUE);
-  }
-
-  public Flux<Message> getMessages(long first, long last)
-  {
-    return service.getMessages(first, last);
-  }
-
-  private Sinks.Many<Message> createSink()
-  {
-    return Sinks
-        .many()
-        .multicast()
-        .onBackpressureBuffer(bufferSize);
-  }
-}
diff --git a/src/main/java/de/juplo/kafka/chat/backend/domain/ChatRoomData.java b/src/main/java/de/juplo/kafka/chat/backend/domain/ChatRoomData.java
new file mode 100644
index 00000000..873e58e7
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/chat/backend/domain/ChatRoomData.java
@@ -0,0 +1,114 @@
+package de.juplo.kafka.chat.backend.domain;
+
+import lombok.extern.slf4j.Slf4j;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.core.publisher.Sinks;
+import reactor.core.publisher.SynchronousSink;
+
+import java.time.Clock;
+import java.time.LocalDateTime;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+
+@Slf4j
+public class ChatRoom
+{
+  public final static Pattern VALID_USER = Pattern.compile("^[a-z0-9-]{2,}$");
+
+  private final Clock clock;
+  private final ChatRoomService service;
+  private final int bufferSize;
+  private Sinks.Many<Message> sink;
+
+
+  public ChatRoom(
+      Clock clock,
+      ChatRoomService service,
+      int bufferSize)
+  {
+    log.info("Created ChatRoom with buffer-size {}", bufferSize);
+    this.clock = clock;
+    this.service = service;
+    this.bufferSize = bufferSize;
+    // @RequiredArgsConstructor unfortunately not possible, because
+    // the `bufferSize` is not set, if `createSink()` is called
+    // from the variable declaration!
+    this.sink = createSink();
+  }
+
+
+  synchronized public Mono<Message> addMessage(
+      Long id,
+      String user,
+      String text)
+  {
+    Matcher matcher = VALID_USER.matcher(user);
+    if (!matcher.matches())
+      throw new InvalidUsernameException(user);
+
+    Message.MessageKey key = Message.MessageKey.of(user, id);
+    return service
+        .getMessage(key)
+        .handle((Message existing, SynchronousSink<Message> sink) ->
+        {
+          if (existing.getMessageText().equals(text))
+          {
+            sink.next(existing);
+          }
+          else
+          {
+            sink.error(new MessageMutationException(existing, text));
+          }
+        })
+        .switchIfEmpty(
+            Mono
+                .defer(() -> service.persistMessage(key, LocalDateTime.now(clock), text))
+                .doOnNext(m ->
+                {
+                  Sinks.EmitResult result = sink.tryEmitNext(m);
+                  if (result.isFailure())
+                  {
+                    log.warn("Emitting of message failed with {} for {}", result.name(), m);
+                  }
+                }));
+  }
+
+
+  public ChatRoomService getChatRoomService()
+  {
+    return service;
+  }
+
+  public Mono<Message> getMessage(String username, Long messageId)
+  {
+    Message.MessageKey key = Message.MessageKey.of(username, messageId);
+    return service.getMessage(key);
+  }
+
+  synchronized public Flux<Message> listen()
+  {
+    return sink
+        .asFlux()
+        .doOnCancel(() -> sink = createSink()); // Sink hast to be recreated on auto-cancel!
+  }
+
+  public Flux<Message> getMessages()
+  {
+    return getMessages(0, Long.MAX_VALUE);
+  }
+
+  public Flux<Message> getMessages(long first, long last)
+  {
+    return service.getMessages(first, last);
+  }
+
+  private Sinks.Many<Message> createSink()
+  {
+    return Sinks
+        .many()
+        .multicast()
+        .onBackpressureBuffer(bufferSize);
+  }
+}
diff --git a/src/test/java/de/juplo/kafka/chat/backend/domain/ChatRoomDataTest.java b/src/test/java/de/juplo/kafka/chat/backend/domain/ChatRoomDataTest.java
new file mode 100644
index 00000000..822ffe77
--- /dev/null
+++ b/src/test/java/de/juplo/kafka/chat/backend/domain/ChatRoomDataTest.java
@@ -0,0 +1,160 @@
+package de.juplo.kafka.chat.backend.domain;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Mono;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.util.UUID;
+
+import static org.mockito.Mockito.*;
+import static pl.rzrz.assertj.reactor.Assertions.assertThat;
+
+
+public class ChatRoomTest
+{
+  @Test
+  @DisplayName("Assert, that Mono emits expected message, if it exists")
+  void testGetExistingMessage()
+  {
+    // Given
+    String user = "foo";
+    Long messageId = 1l;
+    ChatRoomService chatRoomService = mock(ChatRoomService.class);
+    ChatRoom chatRoom = new ChatRoom(
+        UUID.randomUUID(),
+        "Foo",
+        0,
+        Clock.systemDefaultZone(),
+        chatRoomService,
+        8);
+    Message.MessageKey key = Message.MessageKey.of(user, messageId);
+    LocalDateTime timestamp = LocalDateTime.now();
+    Message message = new Message(key, 0l, timestamp, "Bar");
+    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.just(message));
+
+    // When
+    Mono<Message> mono = chatRoom.getMessage(user, messageId);
+
+    // Then
+    assertThat(mono).emitsExactly(message);
+  }
+
+  @Test
+  @DisplayName("Assert, that Mono if empty, if message does not exists")
+  void testGetNonExistentMessage()
+  {
+    // Given
+    String user = "foo";
+    Long messageId = 1l;
+    ChatRoomService chatRoomService = mock(ChatRoomService.class);
+    ChatRoom chatRoom = new ChatRoom(
+        UUID.randomUUID(),
+        "Foo",
+        0,
+        Clock.systemDefaultZone(),
+        chatRoomService,
+        8);
+    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.empty());
+
+    // When
+    Mono<Message> mono = chatRoom.getMessage(user, messageId);
+
+    // Then
+    assertThat(mono).emitsCount(0);
+  }
+
+  @Test
+  @DisplayName("Assert, that Mono emits expected message, if a new message is added")
+  void testAddNewMessage()
+  {
+    // Given
+    String user = "foo";
+    Long messageId = 1l;
+    ChatRoomService chatRoomService = mock(ChatRoomService.class);
+    ChatRoom chatRoom = new ChatRoom(
+        UUID.randomUUID(),
+        "Foo",
+        0,
+        Clock.systemDefaultZone(),
+        chatRoomService,
+        8);
+    Message.MessageKey key = Message.MessageKey.of(user, messageId);
+    Clock now = Clock.fixed(Instant.now(), ZoneId.systemDefault());
+    LocalDateTime timestamp = LocalDateTime.now(now);
+    String messageText = "Bar";
+    Message message = new Message(key, 0l, timestamp, messageText);
+    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.empty());
+    when(chatRoomService.persistMessage(any(Message.MessageKey.class), any(LocalDateTime.class), any(String.class))).thenReturn(Mono.just(message));
+
+    // When
+    Mono<Message> mono = chatRoom.addMessage(messageId, user, messageText);
+
+    // Then
+    assertThat(mono).emitsExactly(message);
+  }
+
+  @Test
+  @DisplayName("Assert, that Mono emits expected message, if an unchanged message is added")
+  void testAddUnchangedMessage()
+  {
+    // Given
+    String user = "foo";
+    Long messageId = 1l;
+    ChatRoomService chatRoomService = mock(ChatRoomService.class);
+    ChatRoom chatRoom = new ChatRoom(
+        UUID.randomUUID(),
+        "Foo",
+        0,
+        Clock.systemDefaultZone(),
+        chatRoomService,
+        8);
+    Message.MessageKey key = Message.MessageKey.of(user, messageId);
+    Clock now = Clock.fixed(Instant.now(), ZoneId.systemDefault());
+    LocalDateTime timestamp = LocalDateTime.now(now);
+    String messageText = "Bar";
+    Message message = new Message(key, 0l, timestamp, messageText);
+    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.just(message));
+    when(chatRoomService.persistMessage(any(Message.MessageKey.class), any(LocalDateTime.class), any(String.class))).thenReturn(Mono.just(message));
+
+    // When
+    Mono<Message> mono = chatRoom.addMessage(messageId, user, messageText);
+
+    // Then
+    assertThat(mono).emitsExactly(message);
+  }
+
+  @Test
+  @DisplayName("Assert, that Mono sends an error, if a message is added again with mutated text")
+  void testAddMutatedMessage()
+  {
+    // Given
+    String user = "foo";
+    Long messageId = 1l;
+    ChatRoomService chatRoomService = mock(ChatRoomService.class);
+    ChatRoom chatRoom = new ChatRoom(
+        UUID.randomUUID(),
+        "Foo",
+        0,
+        Clock.systemDefaultZone(),
+        chatRoomService,
+        8);
+    Message.MessageKey key = Message.MessageKey.of(user, messageId);
+    Clock now = Clock.fixed(Instant.now(), ZoneId.systemDefault());
+    LocalDateTime timestamp = LocalDateTime.now(now);
+    String messageText = "Bar";
+    String mutatedText = "Boom!";
+    Message message = new Message(key, 0l, timestamp, messageText);
+    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.just(message));
+    when(chatRoomService.persistMessage(any(Message.MessageKey.class), any(LocalDateTime.class), any(String.class))).thenReturn(Mono.just(message));
+
+    // When
+    Mono<Message> mono = chatRoom.addMessage(messageId, user, mutatedText);
+
+    // Then
+    assertThat(mono).sendsError();
+  }
+}
diff --git a/src/test/java/de/juplo/kafka/chat/backend/domain/ChatRoomTest.java b/src/test/java/de/juplo/kafka/chat/backend/domain/ChatRoomTest.java
deleted file mode 100644
index 822ffe77..00000000
--- a/src/test/java/de/juplo/kafka/chat/backend/domain/ChatRoomTest.java
+++ /dev/null
@@ -1,160 +0,0 @@
-package de.juplo.kafka.chat.backend.domain;
-
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Test;
-import reactor.core.publisher.Mono;
-
-import java.time.Clock;
-import java.time.Instant;
-import java.time.LocalDateTime;
-import java.time.ZoneId;
-import java.util.UUID;
-
-import static org.mockito.Mockito.*;
-import static pl.rzrz.assertj.reactor.Assertions.assertThat;
-
-
-public class ChatRoomTest
-{
-  @Test
-  @DisplayName("Assert, that Mono emits expected message, if it exists")
-  void testGetExistingMessage()
-  {
-    // Given
-    String user = "foo";
-    Long messageId = 1l;
-    ChatRoomService chatRoomService = mock(ChatRoomService.class);
-    ChatRoom chatRoom = new ChatRoom(
-        UUID.randomUUID(),
-        "Foo",
-        0,
-        Clock.systemDefaultZone(),
-        chatRoomService,
-        8);
-    Message.MessageKey key = Message.MessageKey.of(user, messageId);
-    LocalDateTime timestamp = LocalDateTime.now();
-    Message message = new Message(key, 0l, timestamp, "Bar");
-    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.just(message));
-
-    // When
-    Mono<Message> mono = chatRoom.getMessage(user, messageId);
-
-    // Then
-    assertThat(mono).emitsExactly(message);
-  }
-
-  @Test
-  @DisplayName("Assert, that Mono if empty, if message does not exists")
-  void testGetNonExistentMessage()
-  {
-    // Given
-    String user = "foo";
-    Long messageId = 1l;
-    ChatRoomService chatRoomService = mock(ChatRoomService.class);
-    ChatRoom chatRoom = new ChatRoom(
-        UUID.randomUUID(),
-        "Foo",
-        0,
-        Clock.systemDefaultZone(),
-        chatRoomService,
-        8);
-    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.empty());
-
-    // When
-    Mono<Message> mono = chatRoom.getMessage(user, messageId);
-
-    // Then
-    assertThat(mono).emitsCount(0);
-  }
-
-  @Test
-  @DisplayName("Assert, that Mono emits expected message, if a new message is added")
-  void testAddNewMessage()
-  {
-    // Given
-    String user = "foo";
-    Long messageId = 1l;
-    ChatRoomService chatRoomService = mock(ChatRoomService.class);
-    ChatRoom chatRoom = new ChatRoom(
-        UUID.randomUUID(),
-        "Foo",
-        0,
-        Clock.systemDefaultZone(),
-        chatRoomService,
-        8);
-    Message.MessageKey key = Message.MessageKey.of(user, messageId);
-    Clock now = Clock.fixed(Instant.now(), ZoneId.systemDefault());
-    LocalDateTime timestamp = LocalDateTime.now(now);
-    String messageText = "Bar";
-    Message message = new Message(key, 0l, timestamp, messageText);
-    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.empty());
-    when(chatRoomService.persistMessage(any(Message.MessageKey.class), any(LocalDateTime.class), any(String.class))).thenReturn(Mono.just(message));
-
-    // When
-    Mono<Message> mono = chatRoom.addMessage(messageId, user, messageText);
-
-    // Then
-    assertThat(mono).emitsExactly(message);
-  }
-
-  @Test
-  @DisplayName("Assert, that Mono emits expected message, if an unchanged message is added")
-  void testAddUnchangedMessage()
-  {
-    // Given
-    String user = "foo";
-    Long messageId = 1l;
-    ChatRoomService chatRoomService = mock(ChatRoomService.class);
-    ChatRoom chatRoom = new ChatRoom(
-        UUID.randomUUID(),
-        "Foo",
-        0,
-        Clock.systemDefaultZone(),
-        chatRoomService,
-        8);
-    Message.MessageKey key = Message.MessageKey.of(user, messageId);
-    Clock now = Clock.fixed(Instant.now(), ZoneId.systemDefault());
-    LocalDateTime timestamp = LocalDateTime.now(now);
-    String messageText = "Bar";
-    Message message = new Message(key, 0l, timestamp, messageText);
-    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.just(message));
-    when(chatRoomService.persistMessage(any(Message.MessageKey.class), any(LocalDateTime.class), any(String.class))).thenReturn(Mono.just(message));
-
-    // When
-    Mono<Message> mono = chatRoom.addMessage(messageId, user, messageText);
-
-    // Then
-    assertThat(mono).emitsExactly(message);
-  }
-
-  @Test
-  @DisplayName("Assert, that Mono sends an error, if a message is added again with mutated text")
-  void testAddMutatedMessage()
-  {
-    // Given
-    String user = "foo";
-    Long messageId = 1l;
-    ChatRoomService chatRoomService = mock(ChatRoomService.class);
-    ChatRoom chatRoom = new ChatRoom(
-        UUID.randomUUID(),
-        "Foo",
-        0,
-        Clock.systemDefaultZone(),
-        chatRoomService,
-        8);
-    Message.MessageKey key = Message.MessageKey.of(user, messageId);
-    Clock now = Clock.fixed(Instant.now(), ZoneId.systemDefault());
-    LocalDateTime timestamp = LocalDateTime.now(now);
-    String messageText = "Bar";
-    String mutatedText = "Boom!";
-    Message message = new Message(key, 0l, timestamp, messageText);
-    when(chatRoomService.getMessage(any(Message.MessageKey.class))).thenReturn(Mono.just(message));
-    when(chatRoomService.persistMessage(any(Message.MessageKey.class), any(LocalDateTime.class), any(String.class))).thenReturn(Mono.just(message));
-
-    // When
-    Mono<Message> mono = chatRoom.addMessage(messageId, user, mutatedText);
-
-    // Then
-    assertThat(mono).sendsError();
-  }
-}