class Fluent::EventRouter

def add_rule(pattern, collector)
  @match_rules << Rule.new(pattern, collector)
end

def emit(tag, time, record)
  unless record.nil?
    emit_stream(tag, OneEventStream.new(time, record))
  end
end

def emit_array(tag, array)
  emit_stream(tag, ArrayEventStream.new(array))
end

def emit_error_event(tag, time, record, error)
  @emit_error_handler.emit_error_event(tag, time, record, error)
end

def emit_stream(tag, es)
  match(tag).emit_events(tag, es)
rescue => e
  @emit_error_handler.handle_emits_error(tag, es, e)
end

def find(tag)
  pipeline = nil
  @match_rules.each_with_index { |rule, i|
    if rule.match?(tag)
      if rule.collector.is_a?(Plugin::Filter)
        pipeline ||= Pipeline.new
        pipeline.add_filter(rule.collector)
      else
        if pipeline
          pipeline.set_output(rule.collector)
        else
          # Use Output directly when filter is not matched
          pipeline = rule.collector
        end
        return pipeline
      end
    end
  }
  if pipeline
    # filter is matched but no match
    pipeline.set_output(@default_collector)
    pipeline
  else
    nil
  end
end

def initialize(default_collector, emit_error_handler)
  @match_rules = []
  @match_cache = MatchCache.new
  @default_collector = default_collector
  @emit_error_handler = emit_error_handler
end

def match(tag)
  collector = @match_cache.get(tag) {
    find(tag) || @default_collector
  }
  collector
end

def match?(tag)
  !!find(tag)
end

def suppress_missing_match!
  if @default_collector.respond_to?(:suppress_missing_match!)
    @default_collector.suppress_missing_match!
  end
end