BalancePlanAuthority.h

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/*
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 3 of the
 * License, or any later version.
 *
 * Hypertable is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef Hypertable_Master_BalancePlanAuthority_h
#define Hypertable_Master_BalancePlanAuthority_h

#include <map>

#include <boost/thread/condition.hpp>

#include <Hypertable/Lib/BalancePlan.h>
#include <Hypertable/Lib/MetaLogWriter.h>
#include <Hypertable/Lib/RangeServerRecovery/Plan.h>

#include "Context.h"

namespace Hypertable {

  using namespace Lib;


  class BalancePlanAuthority : public MetaLog::Entity {
  public:

    BalancePlanAuthority(ContextPtr context, MetaLog::WriterPtr &mml_writer);

    BalancePlanAuthority(ContextPtr context, MetaLog::WriterPtr &mml_writer,
                         const MetaLog::EntityHeader &header_);

    virtual ~BalancePlanAuthority() { }

    bool is_empty();

    void create_recovery_plan(const String &location,
                              const vector<QualifiedRangeSpec> &root_specs,
                              const vector<RangeState> &root_states,
                              const vector<QualifiedRangeSpec> &metadata_specs,
                              const vector<RangeState> &metadata_states,
                              const vector<QualifiedRangeSpec> &system_specs, 
                              const vector<RangeState> &system_states,
                              const vector<QualifiedRangeSpec> &user_specs,
                              const vector<RangeState> &user_states);

    void copy_recovery_plan(const String &location, int type,
                            RangeServerRecovery::Plan &out, int &plan_generation);
    
    void remove_recovery_plan(const String &location);

    void remove_from_receiver_plan(const String &location, int type,
                                   const vector<QualifiedRangeSpec> &ranges);

    void remove_table_from_receiver_plan(const String &table_id);

    void change_receiver_plan_location(const String &location, int type,
                                       const String &old_destination,
                                       const String &new_destination);

    void get_receiver_plan_locations(const String &location, int type,
                                     StringSet &locations);
    
    bool recovery_complete(const String &location, int type);

    int get_generation() { std::lock_guard<std::mutex> lock(m_mutex); return m_generation; }

    void set_generation(int new_generation) {
      std::lock_guard<std::mutex> lock(m_mutex);
      m_generation = new_generation;
    }

    void clear_current_set() {
      m_current_set.clear();
    }

    bool register_balance_plan(BalancePlanPtr &plan, int generation,
                               std::vector<MetaLog::EntityPtr> &entities);

    bool get_balance_destination(const TableIdentifier &table,
                                 const RangeSpec &range, String &location);

    void balance_move_complete(const TableIdentifier &table,
                               const RangeSpec &range);

    void set_mml_writer(MetaLog::WriterPtr &mml_writer);

    const String name() override { return "BalancePlanAuthority"; }

    void display(std::ostream &os) override;

    void decode(const uint8_t **bufp, size_t *remainp,
                uint16_t definition_version) override;

  private:

    uint8_t encoding_version() const override;

    size_t encoded_length_internal() const override;

    void encode_internal(uint8_t **bufp) const override;

    void decode_internal(uint8_t version, const uint8_t **bufp,
                         size_t *remainp) override;

    void decode_old(const uint8_t **bufp, size_t *remainp);

    RangeServerRecovery::PlanPtr create_range_plan(const String &location, int type,
                                                   const vector<QualifiedRangeSpec> &specs,
                                                   const vector<RangeState> &states);

    void update_range_plan(RangeServerRecovery::PlanPtr &plan, const String &location,
                           const vector<QualifiedRangeSpec> &new_specs);

    ContextPtr m_context;

    MetaLog::WriterPtr m_mml_writer;

    int m_generation;

    StringSet m_active;

    StringSet::iterator m_active_iter;

    struct RecoveryPlans {
      RangeServerRecovery::PlanPtr plans[4];
    };

    typedef std::map<String, RecoveryPlans> RecoveryPlanMap;

    RecoveryPlanMap m_map;

    struct lt_move_spec {
      bool operator()(const RangeMoveSpecPtr &ms1,
                      const RangeMoveSpecPtr &ms2) const  {
        int cmp = strcmp(ms1->table.id, ms2->table.id);
        if (cmp < 0)
          return true;
        else if (cmp == 0) {
          if (ms1->range < ms2->range)
            return true;
        }
        return false;
      }
    };

    typedef std::set<RangeMoveSpecPtr, lt_move_spec> MoveSetT;

    MoveSetT m_current_set;
  };

  typedef std::shared_ptr<BalancePlanAuthority> BalancePlanAuthorityPtr;


}

#endif // Hypertable_Master_BalancePlanAuthority_h