#40

src/it/events/src/test/java/ChangeUsernameTest.java

@@ -20,7 +20,7 @@ void changesUsername() {
     MatcherAssert.assertThat(
       "Name has changed",
       new ChangeUsername(name)
-        .submitTo(user)
+        .value(user)
         .username(),
       Matchers.equalTo(name)
     );

src/it/events/src/test/java/prep/ChangeUsername.java

@@ -13,7 +13,7 @@ public final class ChangeUsername implements Event<User> {
   private final String name;
 
   @Override
-  public User submitTo(final User user) {
+  public User value(final User user) {
     return new EnUser(user.id(), this.name);
   }
 

src/main/java/io/github/eocqrs/events/Event.java

@@ -38,7 +38,7 @@ public interface Event<X extends Resource<X>> {
    * @param res Object for whom event will be submitted
    * @return New version of Resource
    */
-  X submitTo(X res);
+  X value(X res);
 
   /**
    * Event payload.

src/test/java/io/github/eocqrs/events/EventChainTest.java

@@ -0,0 +1,37 @@
+package io.github.eocqrs.events;
+
+import org.cactoos.set.SetOf;
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.Matchers;
+import org.junit.jupiter.api.Test;
+import pre.Book;
+import pre.BookChain;
+import pre.IsbnUpperCase;
+
+/**
+ * @author Aliaksei Bialiauski ([email protected])
+ * @since 0.0.0
+ */
+public final class EventChainTest {
+
+  @Test
+  void createsChain() {
+    final EventChain<Book> chain = new BookChain(new SetOf<>());
+    MatcherAssert.assertThat(
+      "Chain is not null",
+      chain,
+      Matchers.notNullValue()
+    );
+  }
+
+  @Test
+  void appendsEventsToChain() {
+    final EventChain<Book> chain = new BookChain(new SetOf<>());
+    final EventChain<Book> after = chain.append(new IsbnUpperCase("test"));
+    MatcherAssert.assertThat(
+      "Event is appended to the chain",
+      after.value(),
+      Matchers.hasSize(1)
+    );
+  }
+}

src/test/java/io/github/eocqrs/events/EventTest.java

@@ -0,0 +1,30 @@
+package io.github.eocqrs.events;
+
+import org.hamcrest.MatcherAssert;
+import org.hamcrest.Matchers;
+import org.junit.jupiter.api.Test;
+import pre.Book;
+import pre.IsbnUpperCase;
+
+import java.util.Locale;
+
+/**
+ * @author Aliaksei Bialiauski ([email protected])
+ * @since 0.0.0
+ */
+public final class EventTest {
+
+  @Test
+  void changesIsbn() {
+    final String before = "test";
+    final Book book = new Book.Default(before);
+    final String after = new IsbnUpperCase(book.isbn())
+      .value(book)
+      .isbn();
+    MatcherAssert.assertThat(
+      "ISBN has changed",
+      after,
+      Matchers.equalTo(before.toUpperCase(Locale.ROOT))
+    );
+  }
+}

src/test/java/pre/Book.java

@@ -0,0 +1,25 @@
+package pre;
+
+import io.github.eocqrs.events.Resource;
+import lombok.RequiredArgsConstructor;
+
+/**
+ * @author Aliaksei Bialiauski ([email protected])
+ * @since 0.0.0
+ */
+@SuppressWarnings("JTCOP.RuleAllTestsHaveProductionClass")
+public interface Book extends Resource<Book> {
+
+  String isbn();
+
+  @RequiredArgsConstructor
+  final class Default implements Book {
+
+    private final String isbn;
+
+    @Override
+    public String isbn() {
+      return this.isbn;
+    }
+  }
+}

src/test/java/pre/BookChain.java

@@ -0,0 +1,30 @@
+package pre;
+
+import io.github.eocqrs.events.Event;
+import io.github.eocqrs.events.EventChain;
+import lombok.RequiredArgsConstructor;
+
+import java.util.Collections;
+import java.util.Set;
+
+/**
+ * @author Aliaksei Bialiauski ([email protected])
+ * @since 0.0.0
+ */
+@RequiredArgsConstructor
+@SuppressWarnings("JTCOP.RuleAllTestsHaveProductionClass")
+public final class BookChain implements EventChain<Book> {
+
+  private final Set<Event<Book>> events;
+
+  @Override
+  public Set<Event<Book>> value() {
+    return Collections.unmodifiableSet(this.events);
+  }
+
+  @Override
+  public EventChain<Book> append(final Event<Book> event) {
+    this.events.add(event);
+    return new BookChain(this.events);
+  }
+}

src/test/java/pre/IsbnUpperCase.java

@@ -0,0 +1,30 @@
+package pre;
+
+import io.github.eocqrs.events.Event;
+import lombok.RequiredArgsConstructor;
+
+import java.util.Locale;
+
+/**
+ * @author Aliaksei Bialiauski ([email protected])
+ * @since 0.0.0
+ */
+@RequiredArgsConstructor
+@SuppressWarnings("JTCOP.RuleAllTestsHaveProductionClass")
+public final class IsbnUpperCase implements Event<Book> {
+
+  private final String value;
+
+  @Override
+  public Book value(final Book book) {
+    return new Book.Default(this.value.toUpperCase(Locale.ROOT));
+  }
+
+  @Override
+  public String payload() {
+    return "isbn upper cased -> %s"
+      .formatted(
+        this.value
+      );
+  }
+}