event_publisher_impl.cpp

/*
 *     .============.
 *    //  M A K E  / \
 *   //  C++ DEV  /   \
 *  //  E A S Y  /  \/ \
 * ++ ----------.  \/\  .
 *  \\     \     \ /\  /
 *   \\     \     \   /
 *    \\     \     \ /
 *     -============'
 *
 * Copyright (c) 2018 Hevake and contributors, all rights reserved.
 *
 * This file is part of cpp-tbox (https://github.com/cpp-main/cpp-tbox)
 * Use of this source code is governed by MIT license that can be found
 * in the LICENSE file in the root of the source tree. All contributing
 * project authors may be found in the CONTRIBUTORS.md file in the root
 * of the source tree.
 */
#include "event_publisher_impl.h"

#include <algorithm>
#include "event_subscriber.h"
#include <tbox/base/log.h>

namespace tbox {
namespace flow {

void EventPublisherImpl::subscribe(EventSubscriber *subscriber) {
  auto iter_end = subscriber_vec_.end();
  auto iter = std::remove(subscriber_vec_.begin(), iter_end, subscriber);
  if (iter == iter_end) {
    subscriber_vec_.push_back(subscriber);
  }
}

void EventPublisherImpl::unsubscribe(EventSubscriber *subscriber) {
  {
    auto iter_end = subscriber_vec_.end();
    auto iter = std::remove(subscriber_vec_.begin(), iter_end, subscriber);
    subscriber_vec_.erase(iter, iter_end);
  }
  {
    auto iter_end = tmp_vec_.end();
    auto iter = std::remove(tmp_vec_.begin(), iter_end, subscriber);
    tmp_vec_.erase(iter, iter_end);
  }
}

void EventPublisherImpl::publish(Event event) {
  auto tmp_vec_ = subscriber_vec_;
  while (!tmp_vec_.empty()) {
    auto top_subscriber = tmp_vec_.back();
    if (top_subscriber->onEvent(event))
      break;
    tmp_vec_.pop_back();
  }
  tmp_vec_.clear();
}

}
}