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module Groonga
module Sharding
class Window
include Comparable
include Loggable
attr_reader :unit
attr_reader :step
def initialize(context, shard, shard_range, unit, step, tag)
@context = context
@shard = shard
@shard_range = shard_range
@unit = unit
@step = step
@tag = tag
@between = Groonga::Context.instance["between"]
@target_range = @context.enumerator.target_range
case @unit
when :day
@step_second = (60 * 60 * 24) * @step
when :hour
@step_second = (60 * 60) * @step
else
raise InvalidArgument "Unexpected unit: #{@unit.inspect}"
end
end
def <=>(other)
case @unit
when other.unit
@step <=> other.unit
when :day # @unit == :day && other.unit == :hour
1
else # @unit == :hour && other.unit == :day
-1
end
end
def each(table)
min = create_min_edge
max = create_max_edge(min)
shard_key = table.find_column(@context.enumerator.shard_key_name)
begin
current_min = min
while current_min < max
next_min = compute_next_min_edge(current_min)
if next_min > max
current_max = max
else
current_max = WindowEdge.new(next_min.year,
next_min.month,
next_min.day,
next_min.hour,
next_min.minute,
next_min.second,
next_min.microsecond,
:exclude)
end
windowed_table = select_by_range(table,
shard_key,
current_min,
current_max)
if windowed_table.empty?
windowed_table.close
else
message = "#{@tag}[window] "
message << "<#{@shard.table_name}>: "
message << inspect_range(current_min, current_max)
logger.log(Logger::Level::DEBUG,
__FILE__,
__LINE__,
__method__.to_s,
message)
yield(windowed_table)
end
current_min = next_min
end
ensure
shard_key.close
end
end
private
def create_min_edge
min = @target_range.min
if min
year = min.year
month = min.month
day = min.day
hour = min.hour
minute = min.min
second = min.sec
microsecond = min.usec
border = @target_range.min_border
else
year = @shard_range.year
month = @shard_range.month
day = 1
hour = 0
minute = 0
second = 0
microsecond = 0
border = :include
end
WindowEdge.new(year, month, day, hour, minute, second, microsecond,
border)
end
def create_max_edge(min)
max = @target_range.max
if max
year = max.year
month = max.month
day = max.day
hour = max.hour
minute = max.min
second = max.sec
microsecond = max.usec
border = @target_range.max_border
else
next_shard_edge = @shard_range.least_over_time
year = next_shard_edge.year
month = next_shard_edge.month
day = next_shard_edge.day
hour = 0
minute = 0
second = 0
microsecond = 0
border = :exclude
end
WindowEdge.new(year, month, day, hour, minute, second, microsecond,
border)
end
def compute_next_min_edge(current_min)
next_edge = Time.at(current_min.to_time.to_i + @step_second)
year = next_edge.year
month = next_edge.month
day = next_edge.day
if @unit == :day
hour = 0
else
hour = next_edge.hour
end
minute = 0
second = 0
microsecond = 0
border = :include
WindowEdge.new(year, month, day, hour, minute, second, microsecond,
border)
end
def select_by_range(table, shard_key, min, max)
expression = Expression.create(table)
begin
expression.append_object(@between, Operator::PUSH, 1)
expression.append_object(shard_key, Operator::PUSH, 1)
expression.append_operator(Operator::GET_VALUE, 1)
expression.append_constant(min.to_s, Operator::PUSH, 1)
expression.append_constant(min.border, Operator::PUSH, 1)
expression.append_constant(max.to_s, Operator::PUSH, 1)
expression.append_constant(max.border, Operator::PUSH, 1)
expression.append_operator(Operator::CALL, 5)
table.select(expression)
ensure
expression.close
end
end
def inspect_range(min, max)
range = ""
if min.border == :include
range << "["
else
range << "("
end
range << min.to_s
range << ","
range << max.to_s
if max.border == :include
range << "]"
else
range << ")"
end
range
end
end
class WindowEdge
include Comparable
attr_reader :year
attr_reader :month
attr_reader :day
attr_reader :hour
attr_reader :minute
attr_reader :second
attr_reader :microsecond
attr_reader :border
def initialize(year, month, day, hour, minute, second, microsecond,
border)
@year = year
@month = month
@day = day
@hour = hour
@minute = minute
@second = second
@microsecond = microsecond
@border = border
end
def to_s
format = "%04d/%02d/%02d %02d:%02d:%02d"
format_values = [@year, @month, @day, @hour, @minute, @second]
unless @microsecond.zero?
format << ".%06d"
format_values << @microsecond
end
format % format_values
end
def to_time
Time.local(@year, @month, @day, @hour, @minute, @second, @microsecond)
end
def values
[@year, @month, @day, @hour, @minute, @second, @microsecond]
end
def <=>(other)
(values + [@border == :include ? 1 : 0]) <=>
(other.values + [other.border == :include ? 1 : 0])
end
end
end
end
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