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48 lines
1.3 KiB
48 lines
1.3 KiB
// 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_LEVELDB_DB_LOG_WRITER_H_ |
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#define STORAGE_LEVELDB_DB_LOG_WRITER_H_ |
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#include <stdint.h> |
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#include "db/log_format.h" |
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#include "leveldb/slice.h" |
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#include "leveldb/status.h" |
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namespace leveldb { |
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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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int block_offset_; // Current offset in block |
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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 EmitPhysicalRecord(RecordType type, const char* ptr, 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 leveldb |
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#endif // STORAGE_LEVELDB_DB_LOG_WRITER_H_
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