Class: RubyEventStore::Sequel::EventRepository

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_event_store/sequel/event_repository.rb

Constant Summary collapse

UPSERT_COLUMNS = 
%i[event_type data metadata valid_at].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sequel:, serializer:) ⇒ EventRepository

Returns a new instance of EventRepository.



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 8

def initialize(sequel:, serializer:)
  @serializer = serializer
  @index_violation_detector = IndexViolationDetector.new("event_store_events", "event_store_events_in_streams")
  @db = sequel
  @db.timezone = :utc
end

Instance Attribute Details

#index_violation_detector ⇒ Object (readonly)

Returns the value of attribute index_violation_detector.



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 15

def index_violation_detector
  @index_violation_detector
end

Instance Method Details

#append_to_stream(records, stream, expected_version) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 17

def append_to_stream(records, stream, expected_version)
  resolved_version = resolved_version(expected_version, stream)

  @db.transaction do
    records.map.with_index do |record, index|
      serialized_record = record.serialize(@serializer)

      @db[:event_store_events].insert(
        event_id: serialized_record.event_id,
        event_type: serialized_record.event_type,
        data: serialized_record.data,
        metadata: serialized_record.metadata,
        created_at: record.timestamp,
        valid_at: optimize_timestamp(record.valid_at, record.timestamp),
      )
      unless stream.global?
        @db[:event_store_events_in_streams].insert(
          event_id: serialized_record.event_id,
          stream: stream.name,
          created_at: Time.now.utc,
          position: resolved_version ? resolved_version + index + 1 : nil,
        )
      end
    end
  end
  self
rescue ::Sequel::UniqueConstraintViolation => ex
  raise EventDuplicatedInStream if index_violation_detector.detect(ex.message)
  raise WrongExpectedEventVersion
end

#count(specification) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 140

def count(specification)
  read_(specification).count
end

#delete_stream(stream) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 102

def delete_stream(stream)
  @db[:event_store_events_in_streams].where(stream: stream.name).delete
end

#event_in_stream?(event_id, stream) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 98

def event_in_stream?(event_id, stream)
  @db[:event_store_events_in_streams].where(event_id: event_id, stream: stream.name).any?
end

#global_position(event_id) ⇒ Object

Raises:

  • (EventNotFound) 


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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 88

def global_position(event_id)
  record =
    @db[:event_store_events]
      .select(::Sequel[:event_store_events][:id])
      .where(::Sequel[:event_store_events][:event_id] => event_id)
      .first
  raise EventNotFound.new(event_id) if record.nil?
  record[:id] - 1
end

#has_event?(event_id) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 106

def has_event?(event_id)
  @db[:event_store_events].where(event_id: event_id).any?
end

#last_stream_event(stream) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 110

def last_stream_event(stream)
  row = @db[:event_store_events_in_streams].where(stream: stream.name).order(:position, :id).last
  return row if row.nil?
  event = @db[:event_store_events].where(event_id: row[:event_id]).first
  SerializedRecord.new(
    event_id: event[:event_id],
    event_type: event[:event_type],
    data: event[:data],
    metadata: event[:metadata],
    timestamp: event[:created_at].iso8601(TIMESTAMP_PRECISION),
    valid_at: (event[:valid_at] || event[:created_at]).iso8601(TIMESTAMP_PRECISION),
  ).deserialize(@serializer)
end

#link_to_stream(event_ids, stream, expected_version) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 48

def link_to_stream(event_ids, stream, expected_version)
  (
    event_ids -
      @db[:event_store_events]
        .select(::Sequel[:event_store_events][:event_id])
        .where(::Sequel[:event_store_events][:event_id] => event_ids)
        .map { |e| e[:event_id] }
  ).each { |id| raise EventNotFound.new(id) }

  resolved_version = resolved_version(expected_version, stream)

  @db.transaction do
    event_ids.map.with_index do |event_id, index|
      @db[:event_store_events_in_streams].insert(
        event_id: event_id,
        stream: stream.name,
        created_at: Time.now.utc,
        position: resolved_version ? resolved_version + index + 1 : nil,
      )
    end
  end
  self
rescue ::Sequel::UniqueConstraintViolation => ex
  raise EventDuplicatedInStream if index_violation_detector.detect(ex.message)
  raise WrongExpectedEventVersion
end

#position_in_stream(event_id, stream) ⇒ Object

Raises:

  • (EventNotFoundInStream) 


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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 75

def position_in_stream(event_id, stream)
  record =
    @db[:event_store_events_in_streams]
      .select(::Sequel[:event_store_events_in_streams][:position])
      .where(
        ::Sequel[:event_store_events_in_streams][:event_id] => event_id,
        ::Sequel[:event_store_events_in_streams][:stream] => stream.name,
      )
      .first
  raise EventNotFoundInStream.new if record.nil?
  record[:position]
end

#read(specification) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 124

def read(specification)
  if specification.batched?
    stream = read_(specification)
    batch_reader = ->(offset, limit) { stream.offset(offset).limit(limit).map(&method(:record)) }
    RubyEventStore::BatchEnumerator.new(specification.batch_size, specification.limit, batch_reader).each
  elsif specification.first?
    record_ = read_(specification).first
    record(record_) if record_
  elsif specification.last?
    record_ = read_(specification).last
    record(record_) if record_
  else
    read_(specification).map { |h| record(h) }.each
  end
end

#streams_of(event_id) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 171

def streams_of(event_id)
  @db[:event_store_events_in_streams].where(event_id: event_id).map { |h| Stream.new(h[:stream]) }
end

#update_messages(records) ⇒ Object 



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# File 'lib/ruby_event_store/sequel/event_repository.rb', line 144

def update_messages(records)
  hashes = records.map { |record| upsert_hash(record, record.serialize(@serializer)) }
  for_update = records.map(&:event_id)
  @db.transaction do
    existing =
      @db[:event_store_events]
        .where(event_id: for_update)
        .select(:event_id, :id, :created_at, :valid_at)
        .reduce({}) do |acc, record|
          acc.merge(record[:event_id] => [record[:id], record[:created_at], record[:valid_at]])
        end

    (for_update - existing.keys).each { |id| raise EventNotFound.new(id) }
    hashes.each do |h|
      h[:id] = existing.fetch(h.fetch(:event_id)).at(0)
      h[:created_at] = existing.fetch(h.fetch(:event_id)).at(1)
      h[:valid_at] = existing.fetch(h.fetch(:event_id)).at(2)
    end

    if supports_on_duplicate_key_update?
      commit_on_duplicate_key_update(hashes)
    else
      commit_insert_conflict_update(hashes)
    end
  end
end