Class: Dalton::Connection

Inherits:
Object show all
Includes:
Datomization
Defined in:
lib/dalton/connection.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Datomization

#datomize, #set_up_datomizer

Constructor Details

#initialize(uri) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/dalton/connection.rb', line 9

def initialize(uri)
  @uri = uri
end

Instance Attribute Details

#datomic_connection ⇒ Object (readonly)

Returns the value of attribute datomic_connection.



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# File 'lib/dalton/connection.rb', line 20

def datomic_connection
  @datomic_connection
end

#db ⇒ Object

Returns the value of attribute db.



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# File 'lib/dalton/connection.rb', line 20

def db
  @db
end

#uri ⇒ Object (readonly)

Returns the value of attribute uri.



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# File 'lib/dalton/connection.rb', line 20

def uri
  @uri
end

Class Method Details

.connect(uri) ⇒ Object 



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# File 'lib/dalton/connection.rb', line 13

def self.connect(uri)
  Peer.createDatabase(uri)
  database = new(uri)
  database.connect
  return database
end

.convert_datoms(datoms) ⇒ Object 



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# File 'lib/dalton/connection.rb', line 75

def self.convert_datoms(datoms)
  case datoms
    when Array
      Translation.from_ruby(datoms)
    when String
      Utility.read_edn(datoms)
    else
      raise ArgumentError, 'datoms must be an Array or a String containing EDN.'
  end
end

.tempid(partition = :'db.part/user', id = nil) ⇒ Object 



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# File 'lib/dalton/connection.rb', line 86

def self.tempid(partition=:'db.part/user', id=nil)
  partition = Keyword.intern(partition.to_s.sub(/^:/, ''))
  if id
    Peer.tempid(partition, id)
  else
    Peer.tempid(partition)
  end
end

.tempid?(id) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dalton/connection.rb', line 95

def self.tempid?(id)
  0 > case id
  when Numeric
    id
  when Java::DatomicDb::DbId
    id.get(Utility::kw('idx'))
  end
end

Instance Method Details

#connect ⇒ Object 



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# File 'lib/dalton/connection.rb', line 32

def connect
  @datomic_connection = Peer.connect(uri) or
    raise DatomicError, "Unable to connect to database at \"#{uri}\"."
  refresh
  true
end

#create ⇒ Object 



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# File 'lib/dalton/connection.rb', line 22

def create
  Peer.createDatabase(uri) or
    raise DatomicError, "Unable to create database at \"#{uri}\"."
end

#destroy ⇒ Object 



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# File 'lib/dalton/connection.rb', line 27

def destroy
  Peer.deleteDatabase(uri) or
    raise DatomicError, "Unable to destroy database at \"#{uri}\"."
end

#refresh ⇒ Object 



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# File 'lib/dalton/connection.rb', line 43

def refresh
  self.db = @datomic_connection.db
  db
end

#retract(entity) ⇒ Object 



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# File 'lib/dalton/connection.rb', line 70

def retract(entity)
  entity_id = entity.is_a?(Entity) ? entity.id : entity
  transact([[:'db.fn/retractEntity', entity_id]])
end

#transact(datoms) ⇒ Object 



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# File 'lib/dalton/connection.rb', line 48

def transact(datoms)
  data = self.class.convert_datoms(datoms)
  # STDERR.puts "data=#{data.to_edn}"
  result = TransactionResult.new(@datomic_connection.transact(data).get)
  self.db = result.db_after
  Translation.from_clj(result)
rescue Java::JavaUtilConcurrent::ExecutionException => e
  cause = e.getCause
  if cause.respond_to?(:data)
    err_data = Translation.from_clj(cause.data)
    case err_data[:'db/error']
    when :'db.error/unique-conflict'
      raise UniqueConflict.parse(cause.getMessage)
    when :'db.error/wrong-type-for-attribute'
      raise TypeError.parse(cause.getMessage)
    end
  end

  raise DatomicError, "Transaction failed: #{e.getMessage}"
end