From cb1e39f0a35cc2b36fb748c26f69cd27e0ed5332 Mon Sep 17 00:00:00 2001 From: Pieter Wuille Date: Tue, 20 Aug 2013 14:17:45 +0200 Subject: Squashed 'src/leveldb/' content from commit a02ddf9 git-subtree-dir: src/leveldb git-subtree-split: a02ddf9b14d145e88185ee209ab8b01d8826663a --- db/log_writer.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 db/log_writer.h (limited to 'db/log_writer.h') diff --git a/db/log_writer.h b/db/log_writer.h new file mode 100644 index 0000000000..a3a954d967 --- /dev/null +++ b/db/log_writer.h @@ -0,0 +1,48 @@ +// Copyright (c) 2011 The LevelDB Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef STORAGE_LEVELDB_DB_LOG_WRITER_H_ +#define STORAGE_LEVELDB_DB_LOG_WRITER_H_ + +#include +#include "db/log_format.h" +#include "leveldb/slice.h" +#include "leveldb/status.h" + +namespace leveldb { + +class WritableFile; + +namespace log { + +class Writer { + public: + // Create a writer that will append data to "*dest". + // "*dest" must be initially empty. + // "*dest" must remain live while this Writer is in use. + explicit Writer(WritableFile* dest); + ~Writer(); + + Status AddRecord(const Slice& slice); + + private: + WritableFile* dest_; + int block_offset_; // Current offset in block + + // crc32c values for all supported record types. These are + // pre-computed to reduce the overhead of computing the crc of the + // record type stored in the header. + uint32_t type_crc_[kMaxRecordType + 1]; + + Status EmitPhysicalRecord(RecordType type, const char* ptr, size_t length); + + // No copying allowed + Writer(const Writer&); + void operator=(const Writer&); +}; + +} // namespace log +} // namespace leveldb + +#endif // STORAGE_LEVELDB_DB_LOG_WRITER_H_ -- cgit v1.2.3