/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * Licensed 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.
 */

#include <folly/io/async/EventBaseThread.h>

#include <folly/Memory.h>
#include <folly/io/async/ScopedEventBaseThread.h>

namespace folly {

EventBaseThread::EventBaseThread() : EventBaseThread(true) {}

EventBaseThread::EventBaseThread(
    bool autostart,
    EventBaseManager* ebm,
    folly::StringPiece threadName)
    : ebm_(ebm) {
  if (autostart) {
    start(threadName);
  }
}

EventBaseThread::EventBaseThread(
    bool autostart,
    std::unique_ptr<EventBaseBackendBase>&& evb,
    EventBaseManager* ebm,
    folly::StringPiece threadName)
    : ebm_(ebm), evb_(std::move(evb)) {
  if (autostart) {
    start(threadName);
  }
}

EventBaseThread::EventBaseThread(EventBaseManager* ebm)
    : EventBaseThread(true, ebm) {}

EventBaseThread::~EventBaseThread() = default;

EventBaseThread::EventBaseThread(EventBaseThread&&) noexcept = default;
EventBaseThread& EventBaseThread::operator=(EventBaseThread&&) noexcept =
    default;

EventBase* EventBaseThread::getEventBase() const {
  return th_ ? th_->getEventBase() : nullptr;
}

bool EventBaseThread::running() const {
  return !!th_;
}

void EventBaseThread::start(folly::StringPiece threadName) {
  if (th_) {
    return;
  }
  th_ = std::make_unique<ScopedEventBaseThread>(
      std::move(evb_), ebm_, threadName);
}

void EventBaseThread::stop() {
  th_ = nullptr;
}
} // namespace folly