class EventSource::Postgres::Get

Public Class Methods

build(batch_size: nil, session: nil) click to toggle source
# File lib/event_source/postgres/get.rb, line 10
def self.build(batch_size: nil, session: nil)
  new(batch_size).tap do |instance|
    instance.configure(session: session)
  end
end
call(stream_name, position: nil, batch_size: nil, session: nil) click to toggle source
# File lib/event_source/postgres/get.rb, line 26
def self.call(stream_name, position: nil, batch_size: nil, session: nil)
  instance = build(batch_size: batch_size, session: session)
  instance.(stream_name, position: position)
end
configure(receiver, attr_name: nil, position: nil, batch_size: nil, session: nil) click to toggle source
# File lib/event_source/postgres/get.rb, line 16
def self.configure(receiver, attr_name: nil, position: nil, batch_size: nil, session: nil)
  attr_name ||= :get
  instance = build(batch_size: batch_size, session: session)
  receiver.public_send "#{attr_name}=", instance
end

Public Instance Methods

call(stream_name, position: nil) click to toggle source
# File lib/event_source/postgres/get.rb, line 31
def call(stream_name, position: nil)
  logger.trace { "Getting event data (Position: #{position.inspect}, Stream Name: #{stream_name}, Batch Size: #{batch_size.inspect})" }

  records = get_records(stream_name, position)

  events = convert(records)

  logger.info { "Finished getting event data (Count: #{events.length}, Position: #{position.inspect}, Stream Name: #{stream_name}, Batch Size: #{batch_size.inspect})" }
  logger.info(tags: [:data, :event_data]) { events.pretty_inspect }

  events
end
configure(session: nil) click to toggle source
# File lib/event_source/postgres/get.rb, line 22
def configure(session: nil)
  Session.configure self, session: session
end
convert(records) click to toggle source
# File lib/event_source/postgres/get.rb, line 56
def convert(records)
  logger.trace { "Converting records to event data (Records Count: #{records.ntuples})" }

  events = records.map do |record|
    record['data'] = Deserialize.data(record['data'])
    record['metadata'] = Deserialize.metadata(record['metadata'])
    record['time'] = Time.utc_coerced(record['time'])

    EventData::Read.build record
  end

  logger.debug { "Converted records to event data (Event Data Count: #{events.length})" }

  events
end
get_records(stream_name, position) click to toggle source
# File lib/event_source/postgres/get.rb, line 44
def get_records(stream_name, position)
  logger.trace { "Getting records (Stream: #{stream_name}, Position: #{position.inspect}, Batch Size: #{batch_size.inspect})" }

  select_statement = SelectStatement.build(stream_name, position: position, batch_size: batch_size)

  records = session.execute(select_statement.sql)

  logger.debug { "Finished getting records (Count: #{records.ntuples}, Stream: #{stream_name}, Position: #{position.inspect}, Batch Size: #{batch_size.inspect})" }

  records
end