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require 'benchmark'
module ActionView
module Helpers
# This helper offers a method to measure the execution time of a block
# in a template.
module BenchmarkHelper
# Allows you to measure the execution time of a block
# in a template and records the result to the log. Wrap this block around
# expensive operations or possible bottlenecks to get a time reading
# for the operation. For example, let's say you thought your file
# processing method was taking too long; you could wrap it in a benchmark block.
#
# <% benchmark "Process data files" do %>
# <%= expensive_files_operation %>
# <% end %>
#
# That would add something like "Process data files (345.2ms)" to the log,
# which you can then use to compare timings when optimizing your code.
#
# You may give an optional logger level as the :level option.
# (:debug, :info, :warn, :error); the default value is :info.
#
# <% benchmark "Low-level files", :level => :debug do %>
# <%= lowlevel_files_operation %>
# <% end %>
#
# Finally, you can pass true as the third argument to silence all log activity
# inside the block. This is great for boiling down a noisy block to just a single statement:
#
# <% benchmark "Process data files", :level => :info, :silence => true do %>
# <%= expensive_and_chatty_files_operation %>
# <% end %>
def benchmark(message = "Benchmarking", options = {})
if controller.logger
if options.is_a?(Symbol)
ActiveSupport::Deprecation.warn("use benchmark('#{message}', :level => :#{options}) instead", caller)
options = { :level => options, :silence => false }
else
options.assert_valid_keys(:level, :silence)
options[:level] ||= :info
end
result = nil
ms = Benchmark.ms { result = options[:silence] ? controller.logger.silence { yield } : yield }
controller.logger.send(options[:level], '%s (%.1fms)' % [ message, ms ])
result
else
yield
end
end
end
end
end
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