fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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72 lines
3.0 KiB
72 lines
3.0 KiB
// Copyright (c) 2015, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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namespace rocksdb {
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class Slice;
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class ColumnFamilyHandle;
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class WriteBatch;
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struct SliceParts;
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// Abstract base class that defines the basic interface for a write batch.
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// See WriteBatch for a basic implementation and WrithBatchWithIndex for an
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// indexed implemenation.
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class WriteBatchBase {
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public:
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virtual ~WriteBatchBase() {}
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// Store the mapping "key->value" in the database.
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virtual void Put(ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) = 0;
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virtual void Put(const Slice& key, const Slice& value) = 0;
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// Variant of Put() that gathers output like writev(2). The key and value
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// that will be written to the database are concatentations of arrays of
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// slices.
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virtual void Put(ColumnFamilyHandle* column_family, const SliceParts& key,
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const SliceParts& value);
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virtual void Put(const SliceParts& key, const SliceParts& value);
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// Merge "value" with the existing value of "key" in the database.
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// "key->merge(existing, value)"
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virtual void Merge(ColumnFamilyHandle* column_family, const Slice& key,
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const Slice& value) = 0;
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virtual void Merge(const Slice& key, const Slice& value) = 0;
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// If the database contains a mapping for "key", erase it. Else do nothing.
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virtual void Delete(ColumnFamilyHandle* column_family, const Slice& key) = 0;
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virtual void Delete(const Slice& key) = 0;
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// variant that takes SliceParts
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virtual void Delete(ColumnFamilyHandle* column_family, const SliceParts& key);
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virtual void Delete(const SliceParts& key);
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// Append a blob of arbitrary size to the records in this batch. The blob will
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// be stored in the transaction log but not in any other file. In particular,
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// it will not be persisted to the SST files. When iterating over this
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// WriteBatch, WriteBatch::Handler::LogData will be called with the contents
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// of the blob as it is encountered. Blobs, puts, deletes, and merges will be
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// encountered in the same order in thich they were inserted. The blob will
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// NOT consume sequence number(s) and will NOT increase the count of the batch
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//
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// Example application: add timestamps to the transaction log for use in
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// replication.
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virtual void PutLogData(const Slice& blob) = 0;
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// Clear all updates buffered in this batch.
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virtual void Clear() = 0;
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// Covert this batch into a WriteBatch. This is an abstracted way of
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// converting any WriteBatchBase(eg WriteBatchWithIndex) into a basic
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// WriteBatch.
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virtual WriteBatch* GetWriteBatch() = 0;
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};
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} // namespace rocksdb
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