YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

// Copyright (c) YugaByte, Inc.

//

// 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 "yb/rpc/poller.h"

#include "yb/rpc/scheduler.h"

#include "yb/util/logging.h"

using namespace std::placeholders;

namespace yb {

namespace rpc {

Poller::Poller(const std::string& log_prefix, std::function<void()> callback)

    : log_prefix_(log_prefix), callback_(callback),

      poll_task_id_(rpc::kUninitializedScheduledTaskId) {

}

void Poller::Start(Scheduler* scheduler, MonoDelta interval) {

  scheduler_ = scheduler;

  interval_ = interval;

  std::lock_guard<std::mutex> lock(mutex_);

  if (!closing_) {

    Schedule();

  }

}

void Poller::Shutdown() NO_THREAD_SAFETY_ANALYSIS {

  std::unique_lock<std::mutex> lock(mutex_);

  if (!closing_) {

    closing_ = true;

    if (scheduler_ == nullptr) {

      // Never started

      return;

    }

    if (poll_task_id_ != rpc::kUninitializedScheduledTaskId) {

      scheduler_->Abort(poll_task_id_);

    }

  }

  cond_.wait(lock, [this]() NO_THREAD_SAFETY_ANALYSIS {

    return poll_task_id_ == rpc::kUninitializedScheduledTaskId;

  });

}

void Poller::Schedule() {

  poll_task_id_ = scheduler_->Schedule(

      std::bind(&Poller::Poll, this, _1), interval_.ToSteadyDuration());

}

void Poller::Poll(const Status& status) {

  {

    std::lock_guard<std::mutex> lock(mutex_);

    if (!status.ok() || closing_) {

      LOG_WITH_PREFIX(INFO) << "Poll stopped: " << status;

      poll_task_id_ = rpc::kUninitializedScheduledTaskId;

      cond_.notify_one();

      return;

    }

  }

  callback_();

  {

    std::lock_guard<std::mutex> lock(mutex_);

    if (!closing_) {

      Schedule();

    } else {

      poll_task_id_ = rpc::kUninitializedScheduledTaskId;

    }

    if (poll_task_id_ == rpc::kUninitializedScheduledTaskId) {

      cond_.notify_one();

    }

  }

}

} // namespace rpc

} // namespace yb