scheduler.h

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// Copyright 2012 Cloudera 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 STATESTORE_SCHEDULER_H
#define STATESTORE_SCHEDULER_H

#include <vector>
#include <string>

#include "common/global-types.h"
#include "common/status.h"
#include "statestore/query-schedule.h"
#include "util/container-util.h"
#include "gen-cpp/Types_types.h"  // for TNetworkAddress
#include "gen-cpp/StatestoreService_types.h"
#include "gen-cpp/PlanNodes_types.h"
#include "gen-cpp/Frontend_types.h"
#include "gen-cpp/ImpalaInternalService_types.h"
#include "gen-cpp/ResourceBrokerService_types.h"

namespace impala {

class Scheduler {
 public:
  virtual ~Scheduler() { }

  typedef std::vector<TBackendDescriptor> BackendList;

  virtual Status GetBackends(const std::vector<TNetworkAddress>& data_locations,
      BackendList* backends) = 0;

  virtual Status GetBackend(const TNetworkAddress& data_location,
      TBackendDescriptor* backend) = 0;

  virtual bool HasLocalBackend(const TNetworkAddress& data_location) = 0;

  virtual void GetAllKnownBackends(BackendList* backends) = 0;

  virtual Status Schedule(Coordinator* coord, QuerySchedule* schedule) = 0;

  virtual Status Release(QuerySchedule* schedule) = 0;

  virtual void HandlePreemptedReservation(const TUniqueId& reservation_id) = 0;

  virtual void HandlePreemptedResource(const TUniqueId& client_resource_id) = 0;

  virtual void HandleLostResource(const TUniqueId& client_resource_id) = 0;

  virtual Status Init() = 0;

};

}

#endif