text: /**
   *    Copyright (C) 2016 MongoDB Inc.
   *
   *    This program is free software: you can redistribute it and/or  modify
   *    it under the terms of the GNU Affero General Public License, version 3,
   *    as published by the Free Software Foundation.
   *
   *    This program 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 Affero General Public License for more details.
   *
   *    You should have received a copy of the GNU Affero General Public License
   *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   *    As a special exception, the copyright holders give permission to link the
   *    code of portions of this program with the OpenSSL library under certain
   *    conditions as described in each individual source file and distribute
   *    linked combinations including the program with the OpenSSL library. You
   *    must comply with the GNU Affero General Public License in all respects for
   *    all of the code used other than as permitted herein. If you modify file(s)
   *    with this exception, you may extend this exception to your version of the
   *    file(s), but you are not obligated to do so. If you do not wish to do so,
   *    delete this exception statement from your version. If you delete this
   *    exception statement from all source files in the program, then also delete
   *    it in the license file.
   */
  
  #pragma once
  
  #include "mongo/base/disallow_copying.h"
  #include "mongo/db/repl/optime.h"
  #include "mongo/db/repl/sync_source_selector.h"
  #include "mongo/stdx/functional.h"
  
  namespace mongo {
  namespace repl {
  
  /**
   * Mock implementation of SyncSourceSelector interface for testing.
   */
  class SyncSourceSelectorMock : public SyncSourceSelector {
      MONGO_DISALLOW_COPYING(SyncSourceSelectorMock);
  
  public:
      using ChooseNewSyncSourceHook = stdx::function<void()>;
  
      SyncSourceSelectorMock();
      virtual ~SyncSourceSelectorMock();
  
      void clearSyncSourceBlacklist() override;
      HostAndPort chooseNewSyncSource(const OpTime& ot) override;
      void blacklistSyncSource(const HostAndPort& host, Date_t until) override;
      bool shouldChangeSyncSource(const HostAndPort&,
                                  const rpc::ReplSetMetadata&,
                                  boost::optional<rpc::OplogQueryMetadata> oqMetadata) override;
  
      /**
       * Sets a function that will be run every time chooseNewSyncSource() is called.
       */
      void setChooseNewSyncSourceHook_forTest(const ChooseNewSyncSourceHook& hook);
  
      /**
       * Sets the result for subsequent chooseNewSyncSource() invocations.
       */
      void setChooseNewSyncSourceResult_forTest(const HostAndPort&);
  
      /**
       * Returns most recent optime passed to chooseNewSyncSource().
       */
      OpTime getChooseNewSyncSourceOpTime_forTest() const;
  
      /**
       * Returns most recently blacklisted sync source.
       */
      HostAndPort getLastBlacklistedSyncSource_forTest() const;
  
      /**
       * Returns the expiration associated with the most recently blacklisted sync source.
       */
      Date_t getLastBlacklistExpiration_forTest() const;
  
  private:
      // This is the sync source that chooseNewSyncSource returns.
      HostAndPort _chooseNewSyncSourceResult = HostAndPort("localhost", -1);
  
      // This is the most recent optime passed to chooseNewSyncSource().
      OpTime _chooseNewSyncSourceOpTime;
  
      // This is run every time chooseNewSyncSource() is called.
      ChooseNewSyncSourceHook _chooseNewSyncSourceHook = []() {};
  
      // This is the most recently blacklisted sync source passed to blacklistSyncSource().
      HostAndPort _lastBlacklistedSyncSource;
  
      // This is the most recent 'util' argument value passed to blacklistSyncSource().
      Date_t _lastBlacklistExpiration;
  };
  
  }  // namespace repl
  }  // namespace mongo
  