Simplify Dapr Messaging interface

sdk-springboot/sdk-spring-core/src/main/java/io/dapr/spring/messaging/DaprMessagingOperations.java

@@ -23,9 +23,8 @@ public interface DaprMessagingOperations<T> {
    * @param topic   the topic to send the message to or {@code null} to send to the
    *                default topic
    * @param message the message to send
-   * @return the id assigned by the broker to the published message
    */
-  Void send(String topic, T message);
+  void send(String topic, T message);
 
   /**
    * Create a {@link SendMessageBuilder builder} for configuring and sending a message.
@@ -53,15 +52,13 @@ interface SendMessageBuilder<T> {
 
     /**
      * Send the message in a blocking manner using the configured specification.
-     *
-     * @return the id assigned by the broker to the published message
      */
-    Void send();
+    void send();
 
     /**
      * Uses the configured specification to send the message in a non-blocking manner.
      *
-     * @return a future that holds the id assigned by the broker to the published message
+     * @return a Mono that completes when the message has been sent
      */
     Mono<Void> sendAsync();
   }

sdk-springboot/sdk-spring-core/src/main/java/io/dapr/spring/messaging/DaprMessagingTemplate.java

@@ -32,17 +32,17 @@ public DaprMessagingTemplate(DaprClient daprClient, String pubsubName) {
   }
 
   @Override
-  public Void send(String topic, T message) {
-    return doSend(topic, message);
+  public void send(String topic, T message) {
+    doSend(topic, message);
   }
 
   @Override
   public SendMessageBuilder<T> newMessage(T message) {
     return new SendMessageBuilderImpl<>(this, message);
   }
 
-  private Void doSend(String topic, T message) {
-    return doSendAsync(topic, message).block();
+  private void doSend(String topic, T message) {
+    doSendAsync(topic, message).block();
   }
 
   private Mono<Void> doSendAsync(String topic, T message) {
@@ -73,8 +73,8 @@ public SendMessageBuilder<T> withTopic(String topic) {
 
 
     @Override
-    public Void send() {
-      return this.template.doSend(this.topic, this.message);
+    public void send() {
+      this.template.doSend(this.topic, this.message);
     }
 
     @Override