НеДобавил фильтры и паралельную обработку событий

src/main/java/org/sadtech/bot/core/domain/Mail.java

@@ -52,6 +52,14 @@ public class Mail extends Content {
         return new Mail(this);
     }
 
+    public List<Attachment> getAttachments() {
+        return attachments;
+    }
+
+    public void setAttachments(List<Attachment> attachments) {
+        this.attachments = attachments;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
@@ -68,11 +76,13 @@ public class Mail extends Content {
         return Objects.hash(super.hashCode(), id, date, message);
     }
 
-    public List<Attachment> getAttachments() {
-        return attachments;
-    }
-
-    public void setAttachments(List<Attachment> attachments) {
-        this.attachments = attachments;
+    @Override
+    public String toString() {
+        return "Mail{" +
+                "id=" + id +
+                ", date=" + date +
+                ", message='" + message + '\'' +
+                ", attachments=" + attachments +
+                '}';
     }
 }

src/main/java/org/sadtech/bot/core/domain/attachment/AudioMessage.java

@@ -1,6 +1,7 @@
 package org.sadtech.bot.core.domain.attachment;
 
 import java.net.URL;
+import java.util.Objects;
 
 public class AudioMessage extends Attachment {
 
@@ -17,4 +18,25 @@ public class AudioMessage extends Attachment {
     public void setLinkOdd(URL linkOdd) {
         this.linkOdd = linkOdd;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof AudioMessage)) return false;
+        AudioMessage that = (AudioMessage) o;
+        return Objects.equals(linkOdd, that.linkOdd);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(linkOdd);
+    }
+
+    @Override
+    public String toString() {
+        return "AudioMessage{" +
+                "linkOdd=" + linkOdd +
+                ", type=" + type +
+                '}';
+    }
 }