Class: TCB::EventStore::ActiveRecord

Inherits:
Object
  • Object
show all
Defined in:
lib/tcb/event_store/active_record.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ActiveRecord

Returns a new instance of ActiveRecord.



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# File 'lib/tcb/event_store/active_record.rb', line 8

def initialize
  @mutex = Mutex.new
end

Instance Method Details

#append(stream_id:, events:, occurred_at: Time.now, correlation_id: nil, causation_id: nil) ⇒ Object 



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# File 'lib/tcb/event_store/active_record.rb', line 12

def append(stream_id:, events:, occurred_at: Time.now, correlation_id: nil, causation_id: nil)
  @mutex.synchronize do
    next_ver = next_version(stream_id)

    envelopes = events.map.with_index(next_ver) do |event, version|
      event_id = SecureRandom.uuid

      event_record_for(stream_id).create!(
        event_id:       event_id,
        stream_id:      stream_id,
        version:        version,
        event_type:     event.class.name,
        payload:        serialize(event),
        occurred_at:    occurred_at,
        correlation_id: correlation_id,
        causation_id:   causation_id
      )

      TCB::Envelope.new(
        event:          event,
        event_id:       event_id,
        stream_id:      stream_id,
        version:        version,
        occurred_at:    occurred_at,
        correlation_id: correlation_id,
        causation_id:   causation_id
      )
    end

    envelopes
  end
end

#read(stream_id, from_version: nil, to_version: nil, occurred_after: nil, limit: nil, order: :asc) ⇒ Object 



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# File 'lib/tcb/event_store/active_record.rb', line 45

def read(stream_id, from_version: nil, to_version: nil, occurred_after: nil, limit: nil, order: :asc)
  scope = event_record_for(stream_id)
    .where(stream_id: stream_id)
    .order(version: order)

  scope = scope.where("version >= ?", from_version) if from_version
  scope = scope.where("version <= ?", to_version) if to_version
  scope = scope.where("occurred_at > ?", occurred_after) if occurred_after
  scope = scope.limit(limit) if limit

  scope.map do |record|
    TCB::Envelope.new(
      event:          deserialize(record.payload),
      event_id:       record.event_id,
      stream_id:      record.stream_id,
      version:        record.version,
      occurred_at:    record.occurred_at,
      correlation_id: record.correlation_id,
      causation_id:   record.causation_id
    )
  end
end

#read_by_correlation(correlation_id, context:, occurred_after: nil, occurred_before: nil) ⇒ Object 



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# File 'lib/tcb/event_store/active_record.rb', line 68

def read_by_correlation(correlation_id, context:, occurred_after: nil, occurred_before: nil)
  tables = find_tables_for_context(context)
  return [] if tables.empty?

  union_sql = tables.map do |table|
    conditions = ["correlation_id = ?"]
    conditions << "occurred_at > ?" if occurred_after
    conditions << "occurred_at < ?" if occurred_before

    "SELECT * FROM #{table} WHERE #{conditions.join(' AND ')}"
  end.join(" UNION ALL ")

  bindings = tables.flat_map do
    params = [correlation_id]
    params << occurred_after  if occurred_after
    params << occurred_before if occurred_before
    params
  end

  sql = "#{union_sql} ORDER BY occurred_at ASC"
  records = ::ActiveRecord::Base.connection.exec_query(
    ::ActiveRecord::Base.sanitize_sql_array([sql, *bindings])
  )

  records.map do |record|
    TCB::Envelope.new(
      event:          deserialize(record["payload"]),
      event_id:       record["event_id"],
      stream_id:      record["stream_id"],
      version:        record["version"],
      occurred_at:    Time.parse(record["occurred_at"].to_s),
      correlation_id: record["correlation_id"],
      causation_id:   record["causation_id"]
    )
  end
end