content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.cassandra.sidecar.utils;
  
  import io.vertx.core.Handler;
  import io.vertx.core.eventbus.EventBus;
  import io.vertx.core.eventbus.Message;
  import io.vertx.core.eventbus.MessageConsumer;
  
  /**
   * Utilities for {@link EventBus}
   */
  public class EventBusUtils
  {
      private EventBusUtils()
      {
          throw new UnsupportedOperationException();
      }
  
      /**
       * Create a local consumer against the specific address. The consumer is going to receive the message at most once
       * @param eventBus event bus for message distribution
       * @param address the address that will register it at
       * @param handler the handler that will process the received messages
       * @param <T> message type
       */
      public static <T> void onceLocalConsumer(EventBus eventBus, String address, Handler<Message<T>> handler)
      {
          MessageConsumer<T> consumer = eventBus.localConsumer(address);
          consumer.handler(msg -> {
              handler.handle(msg);
              consumer.unregister();
          });
      }
  }
  