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git-subtree-dir: src/hyperleveldb git-subtree-split: ac2ae3029dd9c4ed6401c57eef7e1d84b2007bca
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
// 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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#ifndef STORAGE_HYPERLEVELDB_DB_LOG_WRITER_H_
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#define STORAGE_HYPERLEVELDB_DB_LOG_WRITER_H_
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#include <stdint.h>
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#include "log_format.h"
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#include "../hyperleveldb/slice.h"
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#include "../hyperleveldb/status.h"
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#include "../port/port.h"
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namespace hyperleveldb {
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class WritableFile;
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namespace log {
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class Writer {
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public:
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// Create a writer that will append data to "*dest".
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// "*dest" must be initially empty.
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// "*dest" must remain live while this Writer is in use.
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explicit Writer(WritableFile* dest);
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~Writer();
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Status AddRecord(const Slice& slice);
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private:
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WritableFile* dest_;
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port::Mutex offset_mtx_;
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uint64_t offset_; // Current offset in file
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// crc32c values for all supported record types. These are
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// pre-computed to reduce the overhead of computing the crc of the
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// record type stored in the header.
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uint32_t type_crc_[kMaxRecordType + 1];
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Status EmitPhysicalRecordAt(RecordType type, const char* ptr, uint64_t offset, size_t length);
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// No copying allowed
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Writer(const Writer&);
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void operator=(const Writer&);
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};
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} // namespace log
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} // namespace hyperleveldb
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#endif // STORAGE_HYPERLEVELDB_DB_LOG_WRITER_H_
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