Dhruba Borthakur
12 years ago
commit
6c5a4d646a
@ -0,0 +1,92 @@ |
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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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#include "db/db_impl_readonly.h" |
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#include "db/db_impl.h" |
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#include <algorithm> |
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#include <set> |
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#include <string> |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <vector> |
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#include <algorithm> |
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#include "db/db_iter.h" |
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#include "db/dbformat.h" |
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#include "db/filename.h" |
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#include "db/log_reader.h" |
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#include "db/log_writer.h" |
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#include "db/memtable.h" |
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#include "db/table_cache.h" |
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#include "db/version_set.h" |
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#include "db/write_batch_internal.h" |
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#include "leveldb/db.h" |
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#include "leveldb/env.h" |
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#include "leveldb/status.h" |
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#include "leveldb/table.h" |
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#include "leveldb/table_builder.h" |
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#include "port/port.h" |
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#include "table/block.h" |
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#include "table/merger.h" |
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#include "table/two_level_iterator.h" |
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#include "util/coding.h" |
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#include "util/logging.h" |
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#include "util/build_version.h" |
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namespace leveldb { |
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DBImplReadOnly::DBImplReadOnly(const Options& options, |
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const std::string& dbname) |
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: DBImpl(options, dbname) { |
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Log(options_.info_log, "Opening the db in read only mode"); |
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} |
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DBImplReadOnly::~DBImplReadOnly() { |
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} |
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// Implementations of the DB interface
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Status DBImplReadOnly::Get(const ReadOptions& options, |
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const Slice& key, |
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std::string* value) { |
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Status s; |
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Version* current = versions_->current(); |
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SequenceNumber snapshot = versions_->LastSequence(); |
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LookupKey lkey(key, snapshot); |
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Version::GetStats stats; |
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s = current->Get(options, lkey, value, &stats); |
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return s; |
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} |
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Iterator* DBImplReadOnly::NewIterator(const ReadOptions& options) { |
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std::vector<Iterator*> list; |
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versions_->current()->AddIterators(options, &list); |
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Iterator* internal_iter = |
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NewMergingIterator(&internal_comparator_, &list[0], list.size()); |
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return NewDBIterator( |
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&dbname_, env_, user_comparator(), internal_iter, |
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reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_); |
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} |
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Status DB::OpenForReadOnly(const Options& options, const std::string& dbname, |
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DB** dbptr, bool no_log_recory, bool error_if_log_file_exist) { |
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*dbptr = NULL; |
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DBImplReadOnly* impl = new DBImplReadOnly(options, dbname); |
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impl->mutex_.Lock(); |
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VersionEdit edit(impl->NumberLevels()); |
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Status s = impl->Recover(&edit, no_log_recory, error_if_log_file_exist); |
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if (s.ok() && !no_log_recory) { |
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s = impl->versions_->LogAndApply(&edit, &impl->mutex_); |
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} |
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impl->mutex_.Unlock(); |
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if (s.ok()) { |
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*dbptr = impl; |
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} else { |
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delete impl; |
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} |
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return s; |
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} |
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} |
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@ -0,0 +1,72 @@ |
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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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#ifndef STORAGE_LEVELDB_DB_DB_IMPL_READONLY_H_ |
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#define STORAGE_LEVELDB_DB_DB_IMPL_READONLY_H_ |
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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 "leveldb/db.h" |
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#include "leveldb/env.h" |
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#include "port/port.h" |
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#include "util/stats_logger.h" |
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#ifdef USE_SCRIBE |
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#include "scribe/scribe_logger.h" |
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#endif |
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namespace leveldb { |
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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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virtual Status Get(const ReadOptions& options, |
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const Slice& key, |
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std::string* value); |
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virtual Iterator* NewIterator(const ReadOptions&); |
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virtual Status Put(const WriteOptions&, const Slice& key, 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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virtual Status Delete(const WriteOptions&, 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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virtual void CompactRange(const Slice* begin, const Slice* end) { |
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} |
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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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return Status::NotSupported("Not supported operation in read only mode."); |
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} |
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virtual Status Flush(const FlushOptions& options) { |
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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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#endif |
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