Module: SimpleRecord::Sharding::ClassMethods

Included in:
Base
Defined in:
lib/simple_record/sharding.rb

Instance Method Summary collapse

Instance Method Details

#find_sharded(*params) ⇒ Object 



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# File 'lib/simple_record/sharding.rb', line 25

def find_sharded(*params)
  puts 'find_sharded ' + params.inspect

  options = params.size > 1 ? params[1] : {}

  if options[:shard] # User specified shard.
    shard = options[:shard]
    domains = shard.is_a?(Array) ? (shard.collect { |x| prefix_shard_name(x) }) : [prefix_shard_name(shard)]
  else
    domains = sharded_domains
  end
#                puts "sharded_domains=" + domains.inspect

  single = false
  by_ids = false
  case params.first
    when nil then
      raise "Invalid parameters passed to find: nil."
    when :all, :first, :count
      # nada
    else # single id
      by_ids = true
      unless params.first.is_a?(Array)
        single = true
      end
  end
  puts 'single? ' + single.inspect
  puts 'by_ids? ' + by_ids.inspect

  # todo: should have a global executor
  executor = options[:concurrent] ? Concur::Executor.new_multi_threaded_executor : Concur::Executor.new_single_threaded_executor
  results = nil
  if by_ids
    results = []
  else
    results = ShardedResults.new(params)
  end
  futures = []
  domains.each do |d|
    p2 = params.dup
    op2 = options.dup
    op2[:from] = d
    op2[:shard_find] = true
    p2[1] = op2

    futures << executor.execute do
      puts 'executing=' + p2.inspect
      # todo: catch RecordNotFound errors and throw later if there really isn't any record found.
      rs = find(*p2)
      puts 'rs=' + rs.inspect
      rs
    end
  end
  futures.each do |f|
    puts 'getting future ' + f.inspect
    if params.first == :first || single
      puts 'f.get=' + f.get.inspect
      return f.get if f.get
    elsif by_ids
      results << f.get if f.get
    else
      results.add_results f.get
    end
  end
  executor.shutdown
#        puts 'results=' + results.inspect
  if params.first == :first || single
    # Then we found nothing by this point so return nil
    return nil
  elsif params.first == :count
    return results.sum_count
  end
  results

end

#is_sharded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/simple_record/sharding.rb', line 21

def is_sharded?
  @sharding_options
end

#prefix_shard_name(s) ⇒ Object 



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# File 'lib/simple_record/sharding.rb', line 105

def prefix_shard_name(s)
  "#{domain}_#{s}"
end

#shard(options = nil) ⇒ Object 



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# File 'lib/simple_record/sharding.rb', line 13

def shard(options=nil)
  @sharding_options = options
end

#sharded_domains ⇒ Object 



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# File 'lib/simple_record/sharding.rb', line 110

def sharded_domains
  sharded_domains = []
  shard_names = shards
  shard_names.each do |s|
    sharded_domains << prefix_shard_name(s)
  end
  sharded_domains
end

#sharding_options ⇒ Object 



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# File 'lib/simple_record/sharding.rb', line 17

def sharding_options
  @sharding_options
end

#shards ⇒ Object 



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# File 'lib/simple_record/sharding.rb', line 101

def shards
  send(sharding_options[:shards])
end