b06840aa7d
Summary: The change to the public behavior: * When opening a DB or creating new column family client gets a ColumnFamilyHandle. * As long as column family handle is alive, client can do whatever he wants with it, even drop it * Dropped column family can still be read from (using the column family handle) * Added a new call CloseColumnFamily(). Client has to close all column families that he has opened before deleting the DB * As soon as column family is closed, any calls to DB using that column family handle will fail (also any outstanding calls) Internally: * Ref-counting ColumnFamilyData * New thread-safety for ColumnFamilySet * Dropped column families are now completely dropped and their memory cleaned-up Test Plan: added some tests to column_family_test Reviewers: dhruba, haobo, kailiu, sdong CC: leveldb Differential Revision: https://reviews.facebook.net/D16101
105 lines
3.3 KiB
C++
105 lines
3.3 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) 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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#pragma once
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#include "rocksdb/types.h"
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#include "rocksdb/write_batch.h"
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#include "rocksdb/db.h"
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#include "rocksdb/options.h"
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namespace rocksdb {
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class MemTable;
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class ColumnFamilyMemTables {
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public:
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virtual ~ColumnFamilyMemTables() {}
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virtual bool Seek(uint32_t column_family_id) = 0;
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// returns true if the update to memtable should be ignored
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// (useful when recovering from log whose updates have already
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// been processed)
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virtual uint64_t GetLogNumber() const = 0;
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virtual MemTable* GetMemTable() const = 0;
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virtual const Options* GetFullOptions() const = 0;
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virtual ColumnFamilyHandle* GetColumnFamilyHandle() = 0;
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};
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class ColumnFamilyMemTablesDefault : public ColumnFamilyMemTables {
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public:
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ColumnFamilyMemTablesDefault(MemTable* mem, const Options* options)
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: ok_(false), mem_(mem), options_(options) {}
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bool Seek(uint32_t column_family_id) override {
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ok_ = (column_family_id == 0);
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return ok_;
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}
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uint64_t GetLogNumber() const override { return 0; }
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MemTable* GetMemTable() const override {
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assert(ok_);
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return mem_;
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}
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const Options* GetFullOptions() const override {
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assert(ok_);
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return options_;
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}
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ColumnFamilyHandle* GetColumnFamilyHandle() override { return nullptr; }
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private:
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bool ok_;
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MemTable* mem_;
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const Options* const options_;
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};
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// WriteBatchInternal provides static methods for manipulating a
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// WriteBatch that we don't want in the public WriteBatch interface.
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class WriteBatchInternal {
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public:
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// Return the number of entries in the batch.
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static int Count(const WriteBatch* batch);
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// Set the count for the number of entries in the batch.
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static void SetCount(WriteBatch* batch, int n);
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// Return the seqeunce number for the start of this batch.
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static SequenceNumber Sequence(const WriteBatch* batch);
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// Store the specified number as the seqeunce number for the start of
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// this batch.
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static void SetSequence(WriteBatch* batch, SequenceNumber seq);
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static Slice Contents(const WriteBatch* batch) {
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return Slice(batch->rep_);
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}
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static size_t ByteSize(const WriteBatch* batch) {
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return batch->rep_.size();
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}
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static void SetContents(WriteBatch* batch, const Slice& contents);
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// Inserts batch entries into memtable
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// If dont_filter_deletes is false AND options.filter_deletes is true,
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// then --> Drops deletes in batch if db->KeyMayExist returns false
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// If log_number is not-null, the memtable will be updated only if
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// memtables->GetLogNumber() >= log_number
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// See MemTableInserter::IgnoreUpdate()
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static Status InsertInto(const WriteBatch* batch,
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ColumnFamilyMemTables* memtables,
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uint64_t log_number = 0, DB* db = nullptr,
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const bool dont_filter_deletes = true);
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static void Append(WriteBatch* dst, const WriteBatch* src);
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};
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} // namespace rocksdb
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