Class: ActiveRecord::Write

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/write.rb,
lib/active_record/write/version.rb

Constant Summary collapse

DEFAULT_SIZE = 
24
DEFAULT_SERIALIZER = 
::JSON
EMPTY_HASH = 
{}
VERSION = 
"1.1.0"

Instance Method Summary collapse

Constructor Details

#initialize(query:, columns:, target:, size:, serializer:, &transaction) ⇒ Write

query is either an ActiveRecord query object or arel columns is a list of columns you want to have during the transaction target is the table you want to talk to size is the maximum number of running iterations in the pool, default: 24 serializer is the #dump duck for Array & Hash values, default: JSON transaction is the process you want to run against your database



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# File 'lib/active_record/write.rb', line 21

def initialize(query:, columns:, target:, size:, serializer:, &transaction)
  @query = query
  @columns = columns
  @target = target
  @size = size
  @serializer = serializer
  @transaction = transaction
  @table = Arel::Table.new(@target)
  @queue = case
  when activerecord?
    @query.pluck(*@columns)
  when arel?
    ActiveRecord::Base.connection.execute(@query.to_sql).map(&:values)
  when tuple?
    @query.map { |result| result.slice(@columns) }
  when twodimensional?
    @query
  else
    raise ArgumentError, 'query wasn\'t recognizable, please use some that looks like a: ActiveRecord::Base, Arel::SelectManager, Array<*Hash>, Array<*Array>'
  end
  puts "Migrating #{@queue.count} #{@target} records"
end

Instance Method Details

#pool(qutex = Mutex.new) ⇒ Object 



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# File 'lib/active_record/write.rb', line 44

def pool(qutex = Mutex.new)
  # Spin up a number of threads based on the `maximum` given
  1.upto(@size).map do
    Thread.new do
      loop do
        # Try to get a new queue item
        item = qutex.synchronize { @queue.shift }

        if item.nil?
          # There is no more work
          break
        else
          # Wait for a free connection
          ActiveRecord::Base.connection_pool.with_connection do
            ActiveRecord::Base.transaction do
              # Execute each statement coming back
              Array[instance_exec(*item, &@transaction)].each do |instruction|
                ActiveRecord::Base.connection.execute(instruction.to_sql)
              end
            end
          end
        end
      end
    end
  end.map(&:join)
end