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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 (<tt>:debug</tt>, <tt>:info</tt>,
# <tt>:warn</tt>, <tt>:error</tt>) as the <tt>:level</tt> option. The
# default logger level value is <tt>:info</tt>.
#
# <% 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
message = "ActiveSupport::Benchmarkable#silence is deprecated. It will be removed from Rails 4.1."
ActiveSupport::Deprecation.warn message
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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