src/main/cpp/rocketmq/include/AsyncReceiveMessageCallback.h

/*
 * 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.
 */
#pragma once

#include <functional>
#include <system_error>

#include "ProcessQueue.h"
#include "ReceiveMessageCallback.h"

ROCKETMQ_NAMESPACE_BEGIN

class AsyncReceiveMessageCallback
    : public ReceiveMessageCallback,
      public std::enable_shared_from_this<AsyncReceiveMessageCallback> {
public:
  explicit AsyncReceiveMessageCallback(ProcessQueueWeakPtr process_queue);

  ~AsyncReceiveMessageCallback() override = default;

  void onCompletion(const std::error_code &ec,
                    const ReceiveMessageResult &result) override;

  void receiveMessageLater();

  void receiveMessageImmediately();

private:
  /**
   * Hold a weak_ptr to ProcessQueue. Once ProcessQueue was released, stop the
   * pop-cycle immediately.
   */
  ProcessQueueWeakPtr process_queue_;

  std::function<void(void)> receive_message_later_;

  void checkThrottleThenReceive();

  static const char *RECEIVE_LATER_TASK_NAME;
};

ROCKETMQ_NAMESPACE_END