Class: RubyEventStore::InMemoryRepository

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

Instance Method Summary collapse

Constructor Details

#initialize(serializer: NULL) ⇒ InMemoryRepository

Returns a new instance of InMemoryRepository.



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 7

def initialize(serializer: NULL)
  @serializer = serializer
  @streams = Hash.new { |h, k| h[k] = Array.new }
  @mutex   = Mutex.new
  @storage = Hash.new
end

Instance Method Details

#append_to_stream(records, stream, expected_version) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 14

def append_to_stream(records, stream, expected_version)
  serialized_records = records.map { |record| record.serialize(serializer) }

  with_synchronize(expected_version, stream) do |resolved_version|
    raise WrongExpectedEventVersion unless last_stream_version(stream).equal?(resolved_version)

    serialized_records.each do |serialized_record|
      raise EventDuplicatedInStream if has_event?(serialized_record.event_id)
      storage[serialized_record.event_id] = serialized_record
      streams[stream.name] << serialized_record.event_id
    end
  end
  self
end

#count(spec) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 79

def count(spec)
  read_scope(spec).count
end

#delete_stream(stream) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 43

def delete_stream(stream)
  streams.delete(stream.name)
end

#has_event?(event_id) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby_event_store/in_memory_repository.rb', line 47

def has_event?(event_id)
  storage.has_key?(event_id)
end

#last_stream_event(stream) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 51

def last_stream_event(stream)
  last_id = event_ids_of_stream(stream).last
  storage.fetch(last_id).deserialize(serializer) if last_id
end

#link_to_stream(event_ids, stream, expected_version) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 29

def link_to_stream(event_ids, stream, expected_version)
  serialized_records = event_ids.map { |id| read_event(id) }

  with_synchronize(expected_version, stream) do |resolved_version|
    raise WrongExpectedEventVersion unless last_stream_version(stream).equal?(resolved_version)

    serialized_records.each do |serialized_record|
      raise EventDuplicatedInStream if has_event_in_stream?(serialized_record.event_id, stream.name)
      streams[stream.name] << serialized_record.event_id
    end
  end
  self
end

#read(spec) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 56

def read(spec)
  serialized_records = read_scope(spec)
  if spec.batched?
    batch_reader = ->(offset, limit) do
      serialized_records
        .drop(offset)
        .take(limit)
        .map { |serialized_record| serialized_record.deserialize(serializer) }
    end
    BatchEnumerator.new(spec.batch_size, serialized_records.size, batch_reader).each
  elsif spec.first?
    serialized_records.first&.deserialize(serializer)
  elsif spec.last?
    serialized_records.last&.deserialize(serializer)
  else
    Enumerator.new do |y|
      serialized_records.each do |serialized_record|
        y << serialized_record.deserialize(serializer)
      end
    end
  end
end

#streams_of(event_id) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 99

def streams_of(event_id)
  streams
    .select { |name,| has_event_in_stream?(event_id, name) }
    .map    { |name,| Stream.new(name) }
end

#update_messages(records) ⇒ Object 



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# File 'lib/ruby_event_store/in_memory_repository.rb', line 83

def update_messages(records)
  records.each do |record|
    read_event(record.event_id)
    serialized_record =
      Record.new(
        event_id:   record.event_id,
        event_type: record.event_type,
        data:       record.data,
        metadata:   record.metadata,
        timestamp:  Time.iso8601(storage.fetch(record.event_id).timestamp),
        valid_at:   record.valid_at,
      ).serialize(serializer)
    storage[record.event_id] = serialized_record
  end
end