leveldb::DB Class Reference

#include <db.h>

Inheritance diagram for leveldb::DB:

Public Member Functions
	DB ()
virtual	~DB ()
virtual Status	Put (const WriteOptions &options, const Slice &key, const Slice &value)=0
virtual Status	Delete (const WriteOptions &options, const Slice &key)=0
virtual Status	Write (const WriteOptions &options, WriteBatch *updates)=0
virtual Status	Get (const ReadOptions &options, const Slice &key, std::string *value)=0
virtual Iterator *	NewIterator (const ReadOptions &options)=0
virtual const Snapshot *	GetSnapshot ()=0
virtual void	ReleaseSnapshot (const Snapshot *snapshot)=0
virtual bool	GetProperty (const Slice &property, std::string *value)=0
virtual void	GetApproximateSizes (const Range *range, int n, uint64_t *sizes)=0
virtual void	CompactRange (const Slice *begin, const Slice *end)=0

Static Public Member Functions
static Status	Open (const Options &options, const std::string &name, DB **dbptr)

Private Member Functions
	DB (const DB &)
void	operator= (const DB &)

Detailed Description

Definition at line 44 of file db.h.

Constructor & Destructor Documentation

DB() [1/2]

leveldb::DB::DB ( )

inline

Definition at line 55 of file db.h.

{ }

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~DB()

leveldb::DB::~DB ( )

virtual

Definition at line 1488 of file db_impl.cc.

{ }

DB() [2/2]

leveldb::DB::DB ( const DB &  )

private

Member Function Documentation

CompactRange()

virtual void leveldb::DB::CompactRange ( const Slice *  begin, const Slice *  end  )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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Delete()

Status leveldb::DB::Delete ( const WriteOptions &  options, const Slice &  key  )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

Definition at line 1482 of file db_impl.cc.

                                                           {
  WriteBatch batch;
  batch.Delete(key);
  return Write(opt, &batch);
}

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Get()

virtual Status leveldb::DB::Get ( const ReadOptions &  options, const Slice &  key, std::string *  value  )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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GetApproximateSizes()

virtual void leveldb::DB::GetApproximateSizes ( const Range *  range, int  n, uint64_t *  sizes  )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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GetProperty()

virtual bool leveldb::DB::GetProperty ( const Slice &  property, std::string *  value  )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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GetSnapshot()

virtual const Snapshot* leveldb::DB::GetSnapshot ( )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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NewIterator()

virtual Iterator* leveldb::DB::NewIterator ( const ReadOptions &  options )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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Open()

Status leveldb::DB::Open ( const Options &  options, const std::string &  name, DB **  dbptr  )

static

Definition at line 1490 of file db_impl.cc.

                            {
  *dbptr = NULL;

  DBImpl* impl = new DBImpl(options, dbname);
  impl->mutex_.Lock();
  VersionEdit edit;
  // Recover handles create_if_missing, error_if_exists
  bool save_manifest = false;
  Status s = impl->Recover(&edit, &save_manifest);
  if (s.ok() && impl->mem_ == NULL) {
    // Create new log and a corresponding memtable.
    uint64_t new_log_number = impl->versions_->NewFileNumber();
    WritableFile* lfile;
    s = options.env->NewWritableFile(LogFileName(dbname, new_log_number),
                                     &lfile);
    if (s.ok()) {
      edit.SetLogNumber(new_log_number);
      impl->logfile_ = lfile;
      impl->logfile_number_ = new_log_number;
      impl->log_ = new log::Writer(lfile);
      impl->mem_ = new MemTable(impl->internal_comparator_);
      impl->mem_->Ref();
    }
  }
  if (s.ok() && save_manifest) {
    edit.SetPrevLogNumber(0);  // No older logs needed after recovery.
    edit.SetLogNumber(impl->logfile_number_);
    s = impl->versions_->LogAndApply(&edit, &impl->mutex_);
  }
  if (s.ok()) {
    impl->DeleteObsoleteFiles();
    impl->MaybeScheduleCompaction();
  }
  impl->mutex_.Unlock();
  if (s.ok()) {
    assert(impl->mem_ != NULL);
    *dbptr = impl;
  } else {
    delete impl;
  }
  return s;
}

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operator=()

void leveldb::DB::operator= ( const DB &  )

private

Put()

Status leveldb::DB::Put ( const WriteOptions &  options, const Slice &  key, const Slice &  value  )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

Definition at line 1476 of file db_impl.cc.

                                                                            {
  WriteBatch batch;
  batch.Put(key, value);
  return Write(opt, &batch);
}

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ReleaseSnapshot()

virtual void leveldb::DB::ReleaseSnapshot ( const Snapshot *  snapshot )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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Write()

virtual Status leveldb::DB::Write ( const WriteOptions &  options, WriteBatch *  updates  )

pure virtual

Implemented in leveldb::ModelDB, and leveldb::DBImpl.

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The documentation for this class was generated from the following files:

• include/leveldb/db.h
• db/db_impl.cc