69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package store
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type KVBatch interface {
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Set(key, val []byte)
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Delete(key []byte)
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Merge(key []byte, oper AssociativeMerge)
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Execute() error
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Close() error
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}
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type KVIterator interface {
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SeekFirst()
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Seek([]byte)
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Next()
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Current() ([]byte, []byte, bool)
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Key() []byte
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Value() []byte
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Valid() bool
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Close() error
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}
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type KVStore interface {
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Writer() (KVWriter, error)
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Reader() (KVReader, error)
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Close() error
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}
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type KVWriter interface {
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KVReader
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Set(key, val []byte) error
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Delete(key []byte) error
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NewBatch() KVBatch
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}
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type KVReader interface {
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Get(key []byte) ([]byte, error)
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Iterator(key []byte) KVIterator
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Close() error
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}
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type AssociativeMerge interface {
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Merge(key, existing []byte) ([]byte, error)
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}
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type AssociativeMergeChain []AssociativeMerge
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func (a AssociativeMergeChain) Merge(key, orig []byte) ([]byte, error) {
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curr := orig
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for _, m := range a {
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var err error
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curr, err = m.Merge(key, curr)
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if err != nil {
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return nil, err
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}
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}
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return curr, nil
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}
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