Class: Audrey

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/audrey.rb,
lib/audrey.rb

Overview

build fclasses for collections This code needs to go at the bottom of this file because the classes being referenced aren’t defined until after the COLLECTIONS hash is used.

Defined Under Namespace

Modules: Util Classes: Engine, Exception, Mode, Node, Object, Query, Transaction

Constant Summary collapse

VERSION =

version

'0.3'
RUBY_OBJECT_TO_AUDREY =

RUBY_OBJECT_TO_AUDREY

{}
AUDREY_SCALAR_TO_RUBY =

AUDREY_SCALAR_TO_RUBY

{}
AUDREY_COLLECTION_TO_RUBY =

AUDREY_COLLECTION_TO_RUBY

{}
@@current_db = 
nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*params) ⇒ Audrey

initialize



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# File 'lib/audrey.rb', line 43

def initialize(*params)
  @org_opts = self.class.params_to_opts(*params)
  
  # mode
  # KLUDGE: For now, just always using the mode that was sent with the
  # "new" command. Eventually we'll need to recognize that different
  # partitions will have different modes
  @mode = Audrey::Mode.new(@org_opts['mode'])
  
  # finalizer
  ObjectSpace.define_finalizer(self, proc { self.class.finalize(self.object_id) })
  
  # engine opts
  @engine_opts = {}
  
  # immediate_commit
  if @org_opts.has_key?('immediate_commit')
    @engine_opts['immediate_commit'] = @org_opts['immediate_commit']
  end
  
  # default autopurge
  @autopurge = true
  
  # connect engine
  connect_engine()
end

Instance Attribute Details

#autopurge ⇒ Object

Returns the value of attribute autopurge.



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# File 'lib/audrey.rb', line 12

def autopurge
  @autopurge
end

#closers ⇒ Object (readonly)

Returns the value of attribute closers.



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# File 'lib/audrey.rb', line 14

def closers
  @closers
end

#engine ⇒ Object (readonly)

Returns the value of attribute engine.



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# File 'lib/audrey.rb', line 11

def engine
  @engine
end

#partition ⇒ Object

Returns the value of attribute partition.



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# File 'lib/audrey.rb', line 13

def partition
  @partition
end

Class Method Details

.connect(*opts) ⇒ Object

connect



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# File 'lib/audrey.rb', line 131

def self.connect(*opts)
  if block_given?
    begin
      db = self.new(*opts)
      
      db.current do
        yield db
      end
    
    # implement db.exit by catching Audrey::Exception::DatabaseExit
    rescue Audrey::Exception::DatabaseExit => e
      # NOTE: for whatever reason, e.db == db doesn't return true,
      # even though they're the same object. Using object_id to
      # bypass that problem.
      unless e.db.object_id == db.object_id
        raise e
      end
      
      # return out of this method
      return nil
    
    # ensure database is closed
    ensure
      db and db.close
    end
  else
    return self.new(*opts)
  end
end

.current_db(opts = {}) ⇒ Object 



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# File 'lib/audrey.rb', line 188

def self.current_db(opts={})
  return @@current_db
end

.current_db=(db) ⇒ Object 



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# File 'lib/audrey.rb', line 205

def self.current_db=(db)
  @@current_db = db
end

.explicit_or_current_db(accessor) ⇒ Object 



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# File 'lib/audrey.rb', line 192

def self.explicit_or_current_db(accessor)
  # $tm.hrm
  
  # explicit accessor was sent
  if accessor
    return accessor
  
  # else return current database
  else
    return @@current_db
  end
end

.finalize(id) ⇒ Object

finalize



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# File 'lib/audrey.rb', line 231

def self.finalize(id)
  # $tm.hrm
  obj = ObjectSpace._id2ref(id)
  obj.close()
end

Instance Method Details

#autocommit(opts = {}, &block) ⇒ Object

autocommit



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# File 'lib/audrey.rb', line 469

def autocommit(opts={}, &block)
  # $tm.hrm
  opts = {'autocommit'=>true}.merge(opts)
  transaction opts, &block
end

#build_array(row) ⇒ Object

build_array



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# File 'lib/audrey.rb', line 264

def build_array(row)
  node = Audrey::Node::Array.new(self, 'pk'=>row['pk'])
  rv = []
  node.attach_to rv
  return rv
end

#changed_objects ⇒ Object

changed_objects



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# File 'lib/audrey.rb', line 526

def changed_objects()
  @engine.changed_objects do |row|
    yield self.object_from_row(row)
  end
end

#checks_outside_transaction(fclass) ⇒ Object

checks_outside_transaction



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# File 'lib/audrey.rb', line 423

def checks_outside_transaction(fclass)
  if fclass.respond_to?('has_checks?')
    if (not in_transaction?) and fclass.has_checks?
      raise 'cannot-create-or-modify-object-that-has-checks-when-not-in-a-transaction'
    end
  end
end

#close ⇒ Object

close



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# File 'lib/audrey.rb', line 244

def close
  # closers
  @closers.keys.each do |k|
    @closers[k].close
    @closers.delete(k)
  end
  
  # purge
  if @engine
    @engine.close 'purge'=>@autopurge
  end
end

#connect_engine ⇒ Object

connect_engine



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# File 'lib/audrey.rb', line 77

def connect_engine
  # objects that should be closed before the database is closed
  @closers = {}
  
  # sqlite3
  if @org_opts['engine'] == 'sqlite3'
    require 'audrey/engine/sqlite3'
    @engine = Audrey::Engine::SQLite3.new(@org_opts['connect'], @mode, @engine_opts)
  else
    # @engine = self.class.initialize_engine(opts)
    raise 'not-yet-implemented-non-sqlite-engine'
  end
  
  # default partition to m
  self.partition = 'm'
end

#current ⇒ Object

current



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# File 'lib/audrey.rb', line 180

def current
  hold_current = Audrey.current_db
  Audrey.current_db = self
  yield
ensure
  Audrey.current_db = hold_current
end

#ensure_object_record(object) ⇒ Object

ensure_object_record



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# File 'lib/audrey.rb', line 306

def ensure_object_record(object)
  # $tm.hrm
  write_check()
  
  # early exit: object already has a audrey object
  if object.respond_to?('audrey')
    return object.audrey.pk
  end
  
  # scalar
  if dfn = Audrey::RUBY_OBJECT_TO_AUDREY[object.class]
    if dfn['nclass']
      pk = @engine.insert_object(object)
      node = dfn['nclass'].new(self, 'pk'=>pk)
      node.attach_to object
      return pk
    else
      return @engine.insert_object(object)
    end
  end
end

#exit ⇒ Object

exit



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# File 'lib/audrey.rb', line 168

def exit()
  e = Audrey::Exception::DatabaseExit.new(self)
  raise e
end

#import_csv(fclass, path, opts = {}) ⇒ Object

import_csv



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# File 'lib/audrey.rb', line 411

def import_csv(fclass, path, opts={})
  # $tm.hrm
  return @engine.import_csv(fclass, path, opts)
end

#insert_object(object) ⇒ Object

insert_object



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# File 'lib/audrey.rb', line 369

def insert_object(object)
  write_check()
  checks_outside_transaction object.class
  return @engine.insert_object(object)
end

#object_from_pk(pk) ⇒ Object

object_from_pk



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# File 'lib/audrey.rb', line 382

def object_from_pk(pk)
  row = @engine.row_by_pk(pk)
  
  if row
    return object_from_row(row)
  else
    return nil
  end
end

#object_from_row(row) ⇒ Object

object_from_row



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# File 'lib/audrey.rb', line 335

def object_from_row(row)
  # $tm.hrm
  
  # scalar
  if dfn = Audrey::AUDREY_SCALAR_TO_RUBY[row['fclass']]
    return dfn.call(row['scalar'])
  end
  
  # collection
  if dfn = Audrey::AUDREY_COLLECTION_TO_RUBY[row['fclass']]
    return dfn['nclass'].create_object(self, 'row'=>row)
  end
  
  # custom class
  if Module.const_defined?(row['fclass'])
    clss = Module.const_get(row['fclass'])
    nclass = Audrey::AUDREY_COLLECTION_TO_RUBY[clss.bclass.to_s]['nclass']
    node = nclass.new(self, 'row'=>row)
    rv = clss.new('db'=>self, 'node'=>node)
    return rv
  end
  
  # if we get this far then we don't know how to turn the row into a
  # Audrey object
  raise 'unknown-fclass: ' + row['fclass'].to_s
end

#purge ⇒ Object

purge



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# File 'lib/audrey.rb', line 278

def purge
  # $tm.hrm
  @engine.purge
end

#q0 ⇒ Object

q0



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# File 'lib/audrey.rb', line 399

def q0
  require 'audrey/query/q0'
  return Audrey::Query::Q0.new(self)
end

#read_check ⇒ Object

read_check, write_check



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# File 'lib/audrey.rb', line 290

def read_check
  # $tm.hrm
  @mode.read or raise Audrey::Exception::Permission::Read.new()
end

#reset ⇒ Object

reset



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# File 'lib/audrey.rb', line 101

def reset
  close()
  connect_engine()
end

#run_checks ⇒ Object

run_checks



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# File 'lib/audrey.rb', line 482

def run_checks()
  # $tm.hrm
  xeme = Xeme.new()
  
  # loop through records that have been changed
  changed_objects() do |obj|
    if obj.class.has_checks?
      obj.class.fields.each do |fieldname, dfn|
        val = obj.audrey[fieldname]
        
        # require
        if dfn.required and val.nil?
          xeme.error('required') do |msg|
            msg['field'] = fieldname
          end
        
        # wrong class
        elsif dfn.fclass and (not val.is_a?(dfn.fclass))
          xeme.error('wrong-fclass') do |msg|
            msg['field'] = fieldname
            msg['fclass'] = dfn.fclass.to_s
          end
        
        # run checks
        else
          dfn.base_checks xeme, fieldname, val
        end
      end
    else
      obj.audrey.changed = false
    end
  end
  
  # return
  return xeme
end

#session_pk ⇒ Object

session_pk



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# File 'lib/audrey.rb', line 216

def session_pk
  if not instance_variable_defined?(:@session_pk)
    @session_pk = Audrey::Util.uuid
  end
  
  return @session_pk
end

#transaction(opts = {}) ⇒ Object

transaction



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# File 'lib/audrey.rb', line 438

def transaction(opts={})
  # $tm.hrm
  
  # yield to block and return nil
  if block_given?
    @engine.transaction(opts) do |tr|
      # yield
      yield tr
      
      # run checks
      # xeme = run_checks()
      
      # autocommit
      if opts['autocommit']
        tr.commit
      end
    end
  
  # else just return transaction
  else
    raise 'not-yet-implemented-non-block-transaction'
  end
end

#write_check ⇒ Object 



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# File 'lib/audrey.rb', line 295

def write_check
  @mode.write or raise Audrey::Exception::Permission::Write.new()
end