mirror of https://github.com/tikv/client-go.git
97 lines
3.0 KiB
Go
97 lines
3.0 KiB
Go
// Copyright 2021 TiKV Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// NOTE: The code in this file is based on code from the
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// TiDB project, licensed under the Apache License v 2.0
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//
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// https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/tests/snapshot_test.go
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//
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// Copyright 2016 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package transaction
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import (
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"context"
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"github.com/tikv/client-go/v2/internal/unionstore"
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)
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// BatchBufferGetter is the interface for BatchGet.
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type BatchBufferGetter interface {
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Len() int
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unionstore.Getter
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BatchGetter
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}
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// BatchGetter is the interface for BatchGet.
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type BatchGetter interface {
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// BatchGet gets a batch of values.
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BatchGet(ctx context.Context, keys [][]byte) (map[string][]byte, error)
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}
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// BufferBatchGetter is the type for BatchGet with MemBuffer.
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type BufferBatchGetter struct {
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buffer BatchBufferGetter
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snapshot BatchGetter
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}
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// NewBufferBatchGetter creates a new BufferBatchGetter.
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func NewBufferBatchGetter(buffer BatchBufferGetter, snapshot BatchGetter) *BufferBatchGetter {
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return &BufferBatchGetter{buffer: buffer, snapshot: snapshot}
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}
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// BatchGet gets a batch of values.
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func (b *BufferBatchGetter) BatchGet(ctx context.Context, keys [][]byte) (map[string][]byte, error) {
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bufferValues, err := b.buffer.BatchGet(ctx, keys)
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if err != nil {
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return nil, err
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}
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if len(bufferValues) == 0 {
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return b.snapshot.BatchGet(ctx, keys)
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}
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shrinkKeys := make([][]byte, 0, len(keys)-len(bufferValues))
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for _, key := range keys {
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val, ok := bufferValues[string(key)]
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if !ok {
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shrinkKeys = append(shrinkKeys, key)
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continue
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}
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// the deleted key should be removed from the result, and also no need to snapshot read it again.
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if len(val) == 0 {
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delete(bufferValues, string(key))
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}
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}
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storageValues, err := b.snapshot.BatchGet(ctx, shrinkKeys)
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if err != nil {
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return nil, err
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}
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for key, val := range storageValues {
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bufferValues[key] = val
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}
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return bufferValues, nil
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}
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