Class: EventSource::Postgres::Get::Last

Inherits:
Object
  • Object
show all
Includes:
Log::Dependency
Defined in:
lib/event_source/postgres/get/last.rb,
lib/event_source/postgres/get/last/select_statement.rb

Defined Under Namespace

Modules: Deserialize, Time Classes: SelectStatement

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.build(session: nil) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 9

def self.build(session: nil)
  new.tap do |instance|
    instance.configure(session: session)
  end
end

.call(stream_name, session: nil) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 25

def self.call(stream_name, session: nil)
  instance = build(session: session)
  instance.(stream_name)
end

.configure(receiver, attr_name: nil, session: nil) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 15

def self.configure(receiver, attr_name: nil, session: nil)
  attr_name ||= :get_last
  instance = build(session: session)
  receiver.public_send "#{attr_name}=", instance
end

Instance Method Details

#__convert(records) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 73

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

    break
  end

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

  events
end

#call(stream_name) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 30

def call(stream_name)
  logger.trace { "Getting last event data (Stream Name: #{stream_name})" }

  record = get_record(stream_name)

  return nil if record.nil?

  event = convert(record)

  logger.info { "Finished getting event data (Stream Name: #{stream_name})" }
  logger.info(tags: [:data, :event_data]) { event.pretty_inspect }

  event
end

#configure(session: nil) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 21

def configure(session: nil)
  Session.configure self, session: session
end

#convert(record) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 59

def convert(record)
  logger.trace { "Converting record to event data" }

  record['data'] = Deserialize.data(record['data'])
  record['metadata'] = Deserialize.metadata(record['metadata'])
  record['time'] = Time.utc_coerced(record['time'])

  event = EventData::Read.build(record)

  logger.debug { "Converted record to event data" }

  event
end

#get_record(stream_name) ⇒ Object 



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# File 'lib/event_source/postgres/get/last.rb', line 45

def get_record(stream_name)
  logger.trace { "Getting last record (Stream: #{stream_name})" }

  select_statement = SelectStatement.build(stream_name)

  records = session.execute(select_statement.sql)

  logger.debug { "Finished getting record (Stream: #{stream_name})" }

  return nil if records.ntuples == 0

  records[0]
end