text: // record_store_test_deleterecord.cpp
  
  /**
   *    Copyright (C) 2014 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.
   */
  
  #include "mongo/db/storage/record_store_test_harness.h"
  
  
  #include "mongo/db/record_id.h"
  #include "mongo/db/storage/record_data.h"
  #include "mongo/db/storage/record_store.h"
  #include "mongo/unittest/unittest.h"
  
  using std::string;
  using std::stringstream;
  
  namespace mongo {
  
      using std::unique_ptr;
  
      // Insert a record and try to delete it.
      TEST( RecordStoreTestHarness, DeleteRecord ) {
          unique_ptr<HarnessHelper> harnessHelper( newHarnessHelper() );
          unique_ptr<RecordStore> rs( harnessHelper->newNonCappedRecordStore() );
  
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              ASSERT_EQUALS( 0, rs->numRecords( opCtx.get() ) );
          }
  
          string data = "my record";
          RecordId loc;
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              {
                  WriteUnitOfWork uow( opCtx.get() );
                  StatusWith<RecordId> res = rs->insertRecord( opCtx.get(),
                                                              data.c_str(),
                                                              data.size() + 1,
                                                              false );
                  ASSERT_OK( res.getStatus() );
                  loc = res.getValue();
                  uow.commit();
              }
          }
  
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              ASSERT_EQUALS( 1, rs->numRecords( opCtx.get() ) );
          }
  
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              {
                  WriteUnitOfWork uow( opCtx.get() );
                  rs->deleteRecord( opCtx.get(), loc );
                  uow.commit();
              }
          }
  
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              ASSERT_EQUALS( 0, rs->numRecords( opCtx.get() ) );
          }
      }
  
      // Insert multiple records and try to delete them.
      TEST( RecordStoreTestHarness, DeleteMultipleRecords ) {
          unique_ptr<HarnessHelper> harnessHelper( newHarnessHelper() );
          unique_ptr<RecordStore> rs( harnessHelper->newNonCappedRecordStore() );
  
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              ASSERT_EQUALS( 0, rs->numRecords( opCtx.get() ) );
          }
  
          const int nToInsert = 10;
          RecordId locs[nToInsert];
          for ( int i = 0; i < nToInsert; i++ ) {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              {
                  stringstream ss;
                  ss << "record " << i;
                  string data = ss.str();
  
                  WriteUnitOfWork uow( opCtx.get() );
                  StatusWith<RecordId> res = rs->insertRecord( opCtx.get(),
                                                              data.c_str(),
                                                              data.size() + 1,
                                                              false );
                  ASSERT_OK( res.getStatus() );
                  locs[i] = res.getValue();
                  uow.commit();
              }
          }
  
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              ASSERT_EQUALS( nToInsert, rs->numRecords( opCtx.get() ) );
          }
  
          for ( int i = 0; i < nToInsert; i++ ) {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              {
                  WriteUnitOfWork uow( opCtx.get() );
                  rs->deleteRecord( opCtx.get(), locs[i] );
                  uow.commit();
              }
          }
  
          {
              unique_ptr<OperationContext> opCtx( harnessHelper->newOperationContext() );
              ASSERT_EQUALS( 0, rs->numRecords( opCtx.get() ) );
          }
      }
  
  } // namespace mongo
  