heron/stmgr/src/cpp/manager/stmgr-client.h

/*
 * Copyright 2015 Twitter, 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.
 */

#ifndef SRC_CPP_SVCS_STMGR_SRC_MANAGER_STMGR_CLIENT_H_
#define SRC_CPP_SVCS_STMGR_SRC_MANAGER_STMGR_CLIENT_H_

#include "network/network_error.h"
#include "proto/messages.h"
#include "network/network.h"
#include "basics/basics.h"

namespace heron {
namespace common {
class MetricsMgrSt;
class MultiCountMetric;
}
}

namespace heron {
namespace stmgr {
class StMgrClientMgr;

class StMgrClient : public Client {
 public:
  StMgrClient(EventLoop* eventLoop, const NetworkOptions& _options, const sp_string& _topology_name,
              const sp_string& _topology_id, const sp_string& _our_id, const sp_string& _other_id,
              StMgrClientMgr* _client_manager,
              heron::common::MetricsMgrSt* _metrics_manager_client);
  virtual ~StMgrClient();

  void Quit();

  void SendTupleStreamMessage(proto::stmgr::TupleStreamMessage2& _msg);
  void SendStartBackPressureMessage();
  void SendStopBackPressureMessage();

 protected:
  virtual void HandleConnect(NetworkErrorCode status);
  virtual void HandleClose(NetworkErrorCode status);

 private:
  void HandleHelloResponse(void*, proto::stmgr::StrMgrHelloResponse* _response, NetworkErrorCode);
  void HandleTupleStreamMessage(proto::stmgr::TupleStreamMessage2* _message);

  void OnReConnectTimer();
  void SendHelloRequest();
  // Do back pressure
  virtual void StartBackPressureConnectionCb(Connection* _connection);
  // Relieve back pressure
  virtual void StopBackPressureConnectionCb(Connection* _connection);

  sp_string topology_name_;
  sp_string topology_id_;
  sp_string our_stmgr_id_;
  sp_string other_stmgr_id_;
  bool quit_;

  StMgrClientMgr* client_manager_;
  // Metrics
  heron::common::MetricsMgrSt* metrics_manager_client_;
  heron::common::MultiCountMetric* stmgr_client_metrics_;

  // Configs to be read
  sp_int32 reconnect_other_streammgrs_interval_sec_;
  sp_int32 reconnect_other_streammgrs_max_attempt_;

  // Counters
  sp_int64 ndropped_messages_;
  sp_int32 reconnect_attempts_;

  // Have we registered ourselves
  bool is_registered_;
};

}  // namespace stmgr
}  // namespace heron

#endif  // SRC_CPP_SVCS_STMGR_SRC_MANAGER_STMGR_CLIENT_H_