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9385a5247e
Summary: <This diff is for Column Family branch> Sharing some of the work I've done so far. This diff compiles and passes the tests. The biggest change is in options.h - I broke down Options into two parts - DBOptions and ColumnFamilyOptions. DBOptions is DB-specific (env, create_if_missing, block_cache, etc.) and ColumnFamilyOptions is column family-specific (all compaction options, compresion options, etc.). Note that this does not break backwards compatibility at all. Further, I created DBWithColumnFamily which inherits DB interface and adds new functions with column family support. Clients can transparently switch to DBWithColumnFamily and it will not break their backwards compatibility. There are few methods worth checking out: ListColumnFamilies(), MultiNewIterator(), MultiGet() and GetSnapshot(). [GetSnapshot() returns the snapshot across all column families for now - I think that's what we agreed on] Finally, I made small changes to WriteBatch so we are able to atomically insert data across column families. Please provide feedback. Test Plan: make check works, the code is backward compatible Reviewers: dhruba, haobo, sdong, kailiu, emayanke CC: leveldb Differential Revision: https://reviews.facebook.net/D14445
100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
// Copyright (c) 2013, 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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//
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// Copyright (c) 2012 Facebook. 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.
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#pragma once
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#include "db/db_impl.h"
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#include <deque>
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#include <set>
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#include "db/dbformat.h"
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#include "db/log_writer.h"
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#include "db/snapshot.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "port/port.h"
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#include "util/stats_logger.h"
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namespace rocksdb {
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class DBImplReadOnly : public DBImpl {
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public:
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DBImplReadOnly(const Options& options, const std::string& dbname);
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virtual ~DBImplReadOnly();
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// Implementations of the DB interface
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using DBImpl::Get;
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virtual Status Get(const ReadOptions& options,
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const Slice& key,
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std::string* value);
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// TODO: Implement ReadOnly MultiGet?
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using DBImpl::NewIterator;
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virtual Iterator* NewIterator(const ReadOptions&);
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virtual Status NewIterators(
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const ReadOptions& options,
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const std::vector<ColumnFamilyHandle>& column_family,
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std::vector<Iterator*>* iterators) {
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// TODO
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return Status::NotSupported("Not supported yet.");
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}
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using DBImpl::Put;
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virtual Status Put(const WriteOptions& options,
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const ColumnFamilyHandle& column_family, const Slice& key,
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const Slice& value) {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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using DBImpl::Merge;
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virtual Status Merge(const WriteOptions& options,
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const ColumnFamilyHandle& column_family, const Slice& key,
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const Slice& value) {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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using DBImpl::Delete;
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virtual Status Delete(const WriteOptions& options,
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const ColumnFamilyHandle& column_family,
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const Slice& key) {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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virtual Status Write(const WriteOptions& options, WriteBatch* updates) {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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using DBImpl::CompactRange;
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virtual void CompactRange(const ColumnFamilyHandle& column_family,
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const Slice* begin, const Slice* end,
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bool reduce_level = false, int target_level = -1) {}
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virtual Status DisableFileDeletions() {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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virtual Status EnableFileDeletions() {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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virtual Status GetLiveFiles(std::vector<std::string>&,
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uint64_t* manifest_file_size,
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bool flush_memtable = true) {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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using DBImpl::Flush;
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virtual Status Flush(const FlushOptions& options,
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const ColumnFamilyHandle& column_family) {
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return Status::NotSupported("Not supported operation in read only mode.");
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}
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private:
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friend class DB;
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// No copying allowed
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DBImplReadOnly(const DBImplReadOnly&);
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void operator=(const DBImplReadOnly&);
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};
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}
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