sbdb/lib/sbdb/environment.rb

118 lines
3.3 KiB
Ruby

require 'bdb'
require 'sbdb/weakhash'
require 'sbdb/db'
require 'sbdb/transaction'
module SBDB
# Environments are for storing one or more databases and are important
# if you want to work with more than one process on one database.
# You needn't use Environment, but it's usefull.
class Environment
INIT_TXN = Bdb::DB_INIT_TXN
INIT_LOCK = Bdb::DB_INIT_LOCK
INIT_LOG = Bdb::DB_INIT_LOG
INIT_MPOOL = Bdb::DB_INIT_MPOOL
INIT_TRANSACTION = INIT_TXN | INIT_LOCK | INIT_LOG | INIT_MPOOL
LOCKDOWN = Bdb::DB_LOCKDOWN
NOMMAP = Bdb::DB_NOMMAP
PRIVATE = Bdb::DB_PRIVATE
SYSTEM_MEM = Bdb::DB_SYSTEM_MEM
TXN_NOSYNC = Bdb::DB_TXN_NOSYNC
LOG_DIRECT = Bdb::DB_LOG_DIRECT
LOG_DSYNC = Bdb::DB_LOG_DSYNC
LOG_AUTO_REMOVE = Bdb::DB_LOG_AUTO_REMOVE
LOG_IN_MEMORY = Bdb::DB_LOG_IN_MEMORY
LOG_ZERO = Bdb::DB_LOG_ZERO
# returns the Bdb-object.
def bdb_object() @env end
# Opens a Btree in this Environment
def btree file, *ps, &exe
open Btree, file, *ps, &exe
end
# Opens a Hash in this Environment
def hash file, *ps, &exe
open Hash, file, *ps, &exe
end
# Opens a Recno in this Environment
def recno file, *ps, &exe
open Recno, file, *ps, &exe
end
# Opens a Queue in this Environment
def queue file, *ps, &exe
open Queue, file, *ps, &exe
end
# Opens a DB of unknown type in this Environment
def unknown file, *ps, &exe
open Unknown, file, *ps, &exe
end
def transaction flg = nil, &exe
SBDB::Transaction.new self, flg, &exe
end
alias txn transaction
# args:
# args[0] => dir
# args[1] => flags
# args[3] => mode
# possible options (via Hash):
# :dir, :flags, :mode, :log_config
def initialize *args
opts = ::Hash === args.last ? args.pop : {}
opts = {:dir => args[0], :flags => args[1], :mode => args[2]}.update opts
@dbs, @env = Ref::WeakValueMap.new, Bdb::Env.new( 0)
@env.log_config opts[:log_config], 1 if opts[:log_config]
@env.lg_bsize = opts[:lg_bsize] if opts[:lg_bsize]
@env.lg_max = opts[:lg_max] if opts[:lg_max]
begin @env.open opts[:dir]||'.', opts[:flags]|| INIT_TRANSACTION|CREATE, opts[:mode]||0
rescue Object
close
raise
end
end
def self.new *args
obj = ret = super( *args)
begin ret = yield obj
ensure SBDB::raise_barrier &obj.method(:close)
end if block_given?
ret
end
# Close the Environment.
# First you should close all databases!
def close
@dbs.each{|key, db|db.close}
@env.close
end
class << self
alias open new
end
# Opens a Database.
# see SBDB::DB, SBDB::Btree, SBDB::Hash, SBDB::Recno, SBDB::Queue
def open type, file, *ps, &exe
ps.push ::Hash.new unless ::Hash === ps.last
ps.last[:env] = self
(type || SBDB::Unkown).new file, *ps, &exe
end
alias db open
alias open_db open
# Returns the DB like open, but if it's already opened,
# it returns the old instance.
# If you use this, never use close. It's possible somebody else use it too.
# The Databases, which are opened, will close, if the Environment will close.
def [] file, *ps, &exe
opts = ::Hash === ps.last ? ps.pop : {}
opts[:env] = self
name, type, flg = ps[0] || opts[:name], ps[1] || opts[:type], ps[2] || opts[:flags]
ps.push opts
@dbs[ [file, name, flg | CREATE]] ||= (type || SBDB::Unknown).new file, *ps, &exe
end
end
Env = Environment
end