Nevar pievienot vairāk kā 25 tēmas
Tēmai ir jāsākas ar burtu vai ciparu, tā var saturēt domu zīmes ('-') un var būt līdz 35 simboliem gara.
91 rindas
3.2 KiB
91 rindas
3.2 KiB
// 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.
|
|
//
|
|
// TableBuilder provides the interface used to build a Table
|
|
// (an immutable and sorted map from keys to values).
|
|
//
|
|
// Multiple threads can invoke const methods on a TableBuilder without
|
|
// external synchronization, but if any of the threads may call a
|
|
// non-const method, all threads accessing the same TableBuilder must use
|
|
// external synchronization.
|
|
|
|
#ifndef STORAGE_LEVELDB_INCLUDE_TABLE_BUILDER_H_
|
|
#define STORAGE_LEVELDB_INCLUDE_TABLE_BUILDER_H_
|
|
|
|
#include <stdint.h>
|
|
#include "leveldb/options.h"
|
|
#include "leveldb/status.h"
|
|
|
|
namespace leveldb {
|
|
|
|
class BlockBuilder;
|
|
class BlockHandle;
|
|
class WritableFile;
|
|
|
|
class TableBuilder {
|
|
public:
|
|
// Create a builder that will store the contents of the table it is
|
|
// building in *file. Does not close the file. It is up to the
|
|
// caller to close the file after calling Finish().
|
|
TableBuilder(const Options& options, WritableFile* file);
|
|
|
|
// REQUIRES: Either Finish() or Abandon() has been called.
|
|
~TableBuilder();
|
|
|
|
// Change the options used by this builder. Note: only some of the
|
|
// option fields can be changed after construction. If a field is
|
|
// not allowed to change dynamically and its value in the structure
|
|
// passed to the constructor is different from its value in the
|
|
// structure passed to this method, this method will return an error
|
|
// without changing any fields.
|
|
Status ChangeOptions(const Options& options);
|
|
|
|
// Add key,value to the table being constructed.
|
|
// REQUIRES: key is after any previously added key according to comparator.
|
|
// REQUIRES: Finish(), Abandon() have not been called
|
|
void Add(const Slice& key, const Slice& value);
|
|
|
|
// Advanced operation: flush any buffered key/value pairs to file.
|
|
// Can be used to ensure that two adjacent entries never live in
|
|
// the same data block. Most clients should not need to use this method.
|
|
// REQUIRES: Finish(), Abandon() have not been called
|
|
void Flush();
|
|
|
|
// Return non-ok iff some error has been detected.
|
|
Status status() const;
|
|
|
|
// Finish building the table. Stops using the file passed to the
|
|
// constructor after this function returns.
|
|
// REQUIRES: Finish(), Abandon() have not been called
|
|
Status Finish();
|
|
|
|
// Indicate that the contents of this builder should be abandoned. Stops
|
|
// using the file passed to the constructor after this function returns.
|
|
// If the caller is not going to call Finish(), it must call Abandon()
|
|
// before destroying this builder.
|
|
// REQUIRES: Finish(), Abandon() have not been called
|
|
void Abandon();
|
|
|
|
// Number of calls to Add() so far.
|
|
uint64_t NumEntries() const;
|
|
|
|
// Size of the file generated so far. If invoked after a successful
|
|
// Finish() call, returns the size of the final generated file.
|
|
uint64_t FileSize() const;
|
|
|
|
private:
|
|
bool ok() const { return status().ok(); }
|
|
void WriteBlock(BlockBuilder* block, BlockHandle* handle);
|
|
|
|
struct Rep;
|
|
Rep* rep_;
|
|
|
|
// No copying allowed
|
|
TableBuilder(const TableBuilder&);
|
|
void operator=(const TableBuilder&);
|
|
};
|
|
|
|
}
|
|
|
|
#endif // STORAGE_LEVELDB_INCLUDE_TABLE_BUILDER_H_
|