github.com/dolthub/dolt/go@v0.40.5-0.20240520175717-68db7794bea6/libraries/doltcore/dbfactory/mem.go (about)

     1  // Copyright 2019 Dolthub, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package dbfactory
    16  
    17  import (
    18  	"context"
    19  	"net/url"
    20  
    21  	"github.com/google/uuid"
    22  
    23  	"github.com/dolthub/dolt/go/store/blobstore"
    24  	"github.com/dolthub/dolt/go/store/datas"
    25  	"github.com/dolthub/dolt/go/store/nbs"
    26  	"github.com/dolthub/dolt/go/store/prolly/tree"
    27  	"github.com/dolthub/dolt/go/store/types"
    28  )
    29  
    30  // MemFactory is a DBFactory implementation for creating in memory backed databases
    31  type MemFactory struct {
    32  }
    33  
    34  func (fact MemFactory) PrepareDB(ctx context.Context, nbf *types.NomsBinFormat, urlObj *url.URL, params map[string]interface{}) error {
    35  	// nothing to prepare
    36  	return nil
    37  }
    38  
    39  // CreateDB creates an in memory backed database
    40  func (fact MemFactory) CreateDB(ctx context.Context, nbf *types.NomsBinFormat, urlObj *url.URL, params map[string]interface{}) (datas.Database, types.ValueReadWriter, tree.NodeStore, error) {
    41  	var db datas.Database
    42  
    43  	bs := blobstore.NewInMemoryBlobstore(uuid.New().String())
    44  	q := nbs.NewUnlimitedMemQuotaProvider()
    45  	cs, err := nbs.NewBSStore(ctx, nbf.VersionString(), bs, defaultMemTableSize, q)
    46  	if err != nil {
    47  		return nil, nil, nil, err
    48  	}
    49  
    50  	vrw := types.NewValueStore(cs)
    51  	ns := tree.NewNodeStore(cs)
    52  	db = datas.NewTypesDatabase(vrw, ns)
    53  	return db, vrw, ns, nil
    54  }