transfer money operation

common-api/src/main/java/com/mz/reactor/ddd/common/api/Message.java

@@ -1,5 +1,6 @@
 package com.mz.reactor.ddd.common.api;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import org.immutables.value.Value;
 
 import java.time.Instant;
@@ -7,6 +8,7 @@ import java.util.Optional;
 
 public interface Message {
 
+  @JsonInclude(JsonInclude.Include.NON_EMPTY)
   Optional<String> correlationId();
 
   @Value.Default

common-api/src/main/java/com/mz/reactor/ddd/common/api/command/CommandHandler.java

@@ -5,6 +5,6 @@ import com.mz.reactor.ddd.common.api.event.DomainEvent;
 @FunctionalInterface
 public interface CommandHandler<A, C extends Command> {
 
-  <E extends DomainEvent> CommandResult<E> execute(A aggregate, C command);
+  CommandResult execute(A aggregate, C command);
 
 }

common-api/src/main/java/com/mz/reactor/ddd/common/api/command/CommandResult.java

@@ -8,20 +8,20 @@ import java.util.Optional;
 import java.util.UUID;
 
 @Value.Immutable
-public interface CommandResult<E extends DomainEvent> {
+public interface CommandResult {
 
   enum StatusCode {
     OK,
     BAD_COMMAND,
     FAILED,
-    NOT_MODIFIED;
+    NOT_MODIFIED
   }
 
   String commandId();
 
   StatusCode statusCode();
 
-  List<E> events();
+  List<? extends DomainEvent> events();
 
   Optional<RuntimeException> error();
 
@@ -29,23 +29,24 @@ public interface CommandResult<E extends DomainEvent> {
     return ImmutableCommandResult.builder();
   }
 
-  static <D extends DomainEvent> CommandResult<D> fromError(RuntimeException error, D event, Command command) {
+  static CommandResult fromError(RuntimeException error, List<? extends DomainEvent> events, Command command) {
     return builder()
         .commandId(Optional.ofNullable(command)
             .map(Command::commandId)
             .orElseGet(() -> UUID.randomUUID().toString()))
-        .statusCode(StatusCode.BAD_COMMAND)
-        .events(Optional.ofNullable(event).map(List::of).orElseGet(List::of))
+        .statusCode(StatusCode.FAILED)
+        .events(events)
         .error(error)
         .build();
   }
 
-  static <D extends DomainEvent> CommandResult<D> badCommand(Command cmd) {
+  static CommandResult badCommand(Command cmd) {
     return builder()
         .commandId(Optional.ofNullable(cmd)
             .map(Command::commandId)
             .orElseGet(() -> UUID.randomUUID().toString()))
         .statusCode(StatusCode.BAD_COMMAND)
+        .events(List.of())
         .build();
   }
 

common-api/src/main/java/com/mz/reactor/ddd/common/api/event/EventApplier.java

@@ -1,8 +1,8 @@
 package com.mz.reactor.ddd.common.api.event;
 
 @FunctionalInterface
-public interface EventApplier<A, E extends DomainEvent> {
+public interface EventApplier<A> {
 
-  A apply(A aggregate, E event);
+  <E extends DomainEvent> A apply(A aggregate, E event);
 
 }

common-api/src/main/java/com/mz/reactor/ddd/common/api/valueobject/Id.java

@@ -5,10 +5,7 @@ public class Id extends StringValue {
     super(value);
   }
 
-  @Override
-  public String toString() {
-    return "Id{" +
-        "value='" + value + '\'' +
-        '}';
+  public static Id of(String id) {
+    return new Id(id);
   }
 }

common-api/src/main/java/com/mz/reactor/ddd/common/api/view/DomainView.java

@@ -1,5 +1,9 @@
 package com.mz.reactor.ddd.common.api.view;
 
-public interface DomainView {
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.mz.reactor.ddd.common.api.event.DomainEvent;
+
+public interface DomainView extends DomainEvent {
+  @JsonIgnore
   String id();
 }