89 lines
2.7 KiB
Ruby
89 lines
2.7 KiB
Ruby
require 'bdb'
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require 'sbdb/weakhash'
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require 'sbdb/db'
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module SBDB
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# Environments are for storing one or more databases and are important
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# if you want to work with more than one process on one database.
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# You needn't use Environment, but it's usefull.
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class Environment
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INIT_TXN = Bdb::DB_INIT_TXN
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INIT_LOCK = Bdb::DB_INIT_LOCK
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INIT_LOG = Bdb::DB_INIT_LOG
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INIT_MPOOL = Bdb::DB_INIT_MPOOL
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INIT_TRANSACTION = INIT_TXN | INIT_LOCK | INIT_LOG | INIT_MPOOL
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LOCKDOWN = Bdb::DB_LOCKDOWN
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NOMMAP = Bdb::DB_NOMMAP
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PRIVATE = Bdb::DB_PRIVATE
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SYSTEM_MEM = Bdb::DB_SYSTEM_MEM
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TXN_NOSYNC = Bdb::DB_TXN_NOSYNC
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# returns the Bdb-object.
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def bdb_object() @env end
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# Opens a Btree in this Environment
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def btree file, name = nil, flags = nil, mode = nil, txn = nil, &e
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Btree.new file, name, flags, mode, txn, self, &e
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end
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# Opens a Hash in this Environment
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def hash file, name = nil, flags = nil, mode = nil, txn = nil, &e
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Hash.new file, name, flags, mode, txn, self, &e
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end
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# Opens a Recno in this Environment
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def recno file, name = nil, flags = nil, mode = nil, txn = nil, &e
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Recno.new file, name, flags, mode, txn, self, &e
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end
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# Opens a Queue in this Environment
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def queue file, name = nil, flags = nil, mode = nil, txn = nil, &e
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Queue.new file, name, flags, mode, txn, self, &e
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end
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# Opens a DB of unknown type in this Environment
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def unknown file, name = nil, flags = nil, mode = nil, txn = nil, &e
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Unknown.new file, name, flags, mode, txn, self, &e
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end
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def initialize dir = nil, flags = nil, mode = nil
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@dbs, @env = WeakHash.new, Bdb::Env.new( 0)
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begin @env.open dir || '.', flags || INIT_TRANSACTION | CREATE, mode || 0
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rescue Object
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close
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raise
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end
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return self unless block_given?
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begin yield self
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ensure close
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end
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nil
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end
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# Close the Environment.
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# First you should close all databases!
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def close
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@dbs.each{|k, db|db.close}
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@env.close
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end
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class << self
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alias open new
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end
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# Opens a Database.
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# see SBDB::DB, SBDB::Btree, SBDB::Hash, SBDB::Recno, SBDB::Queue
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def open type, file, name = nil, flags = nil, mode = nil, txn = nil, &e
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(type || SBDB::Unkown).new file, name, flags, mode, txn, self, &e
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end
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alias db open
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alias open_db open
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# Returns the DB like open, but if it's already opened,
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# it returns the old instance.
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# If you use this, never use close. It's possible somebody else use it too.
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# The Databases, which are opened, will close, if the Environment will close.
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def [] file, name = nil, type = nil, flags = nil, mode = nil, &e
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@dbs[ [file, name, flags | CREATE]] ||= (type || SBDB::Unkown).new file, name, flags, mode, nil, self, &e
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end
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end
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Env = Environment
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end
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