1.java

class NetworkMessage implements MessageSender {
  public send(Message message) {
    //things occur
  }
};

2.java

class MessageCopier implement MessageSender
  private MessageSender messageSender;

  public MessageCopier(MessageSender messageSender) {
    this.messageSender = messageSender;
  }

  public send(Message message) {
    storeMessageSomewhereSafe(message);

    messageSender.send(message);
  }

  private storeMessageSomewhereSafe(Message message) {
    //other things occur
  }
}

3.java

public MessageSender build() {
  return new MessageCopier(new NetworkMessage());
};