lmdb::database Class Reference

Manages a LMDB environment for safe memory-map resizing. Thread-safe. More...

#include <database.h>

Collaboration diagram for lmdb::database:

Public Member Functions
	database (environment env)
	database (database &&)=delete
	database (database const &)=delete
virtual	~database () noexcept
database &	operator= (database &&)=delete
database &	operator= (database const &)=delete
expect< void >	resize () noexcept
expect< read_txn >	create_read_txn (suspended_txn txn=nullptr) noexcept
expect< suspended_txn >	reset_txn (read_txn txn) noexcept
expect< write_txn >	create_write_txn () noexcept
expect< void >	commit (write_txn txn) noexcept
	Commit the read-write transaction. More...
template<typename F >
std::result_of< F(MDB_txn &)>::type	try_write (F f, unsigned attempts=3)

Private Member Functions
MDB_env *	handle () const noexcept
expect< write_txn >	do_create_txn (unsigned int flags) noexcept

Private Attributes
environment	env
context	ctx

Detailed Description

Manages a LMDB environment for safe memory-map resizing. Thread-safe.

Constructor & Destructor Documentation

database() [1/3]

lmdb::database::database

(

environment

env

)

database() [2/3]

lmdb::database::database ( database &&  )

delete

database() [3/3]

lmdb::database::database ( database const &  )

delete

~database()

lmdb::database::~database ( )

virtualnoexcept

Member Function Documentation

commit()

expect< void > lmdb::database::commit ( write_txn  txn )

noexcept

Commit the read-write transaction.

create_read_txn()

expect< read_txn > lmdb::database::create_read_txn ( suspended_txn  txn = nullptr )

noexcept

Returns

A read only LMDB transaction, reusing txn if provided.

create_write_txn()

expect< write_txn > lmdb::database::create_write_txn ( )

noexcept

Returns

A read-write LMDB transaction.

do_create_txn()

expect< write_txn > lmdb::database::do_create_txn ( unsigned int  flags )

privatenoexcept

handle()

MDB_env* lmdb::database::handle ( ) const

inlineprivatenoexcept

Returns

The LMDB environment associated with the object.

operator=() [1/2]

database& lmdb::database::operator= ( database &&  )

delete

operator=() [2/2]

database& lmdb::database::operator= ( database const &  )

delete

reset_txn()

expect< suspended_txn > lmdb::database::reset_txn ( read_txn  txn )

noexcept

Returns

txn after releasing context.

resize()

expect< void > lmdb::database::resize ( )

noexcept

Resize the memory map for the LMDB environment. Will block until all reads/writes on the environment complete.

try_write()

template<typename F >

std::result_of<F(MDB_txn&)>::type lmdb::database::try_write ( F  f, unsigned  attempts = 3  )

inline

Create a write transaction, pass it to f, then try to commit the write if f succeeds.

Template Parameters

F	must be callable with signature expect<T>(MDB_txn&).

Parameters

f	must be re-startable if lmdb::error(MDB_MAP_FULL).

Returns

The result of calling f.

Member Data Documentation

ctx

context lmdb::database::ctx

private

env

environment lmdb::database::env

private

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

• src/lmdb/database.h
• src/lmdb/database.cpp