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require 'active_support/core_ext/benchmark'
require 'active_support/core_ext/hash/keys'
module ActiveSupport
module Benchmarkable
# 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 (:debug, :info, :warn, :error) as the :level option.
# The default logger level 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 (other than the
# timing information) from inside the block. This is great for boiling down a noisy block to
# just a single statement that produces one log line:
#
# <% benchmark "Process data files", :level => :info, :silence => true do %>
# <%= expensive_and_chatty_files_operation %>
# <% end %>
def benchmark(message = "Benchmarking", options = {})
if logger
options.assert_valid_keys(:level, :silence)
options[:level] ||= :info
result = nil
ms = Benchmark.ms { result = options[:silence] ? silence { yield } : yield }
logger.send(options[:level], '%s (%.1fms)' % [ message, ms ])
result
else
yield
end
end
# Silence the logger during the execution of the block.
#
def silence
old_logger_level, logger.level = logger.level, ::Logger::ERROR if logger
yield
ensure
logger.level = old_logger_level if logger
end
end
end
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