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Contents
class Condenser
module Utils
# Public: Write to a file atomically. Useful for situations where you
# don't want other processes or threads to see half-written files.
#
# Utils.atomic_write('important.file') do |file|
# file.write('hello')
# end
#
# Returns nothing.
def self.atomic_write(filename)
dirname, basename = File.split(filename)
basename = [
basename,
Thread.current.object_id,
Process.pid,
rand(1000000)
].join('.'.freeze)
tmpname = File.join(dirname, basename)
File.open(tmpname, 'wb+') do |f|
yield f
end
File.rename(tmpname, filename)
ensure
File.delete(tmpname) if File.exist?(tmpname)
end
# Internal: Inject into target module for the duration of the block.
#
# mod - Module
#
# Returns result of block.
def self.module_include(base, mod)
old_methods = {}
mod.instance_methods.each do |sym|
old_methods[sym] = base.instance_method(sym) if base.method_defined?(sym)
end
mod.instance_methods.each do |sym|
method = mod.instance_method(sym)
base.send(:define_method, sym, method)
end
yield
ensure
mod.instance_methods.each do |sym|
base.send(:undef_method, sym) if base.method_defined?(sym)
end
old_methods.each do |sym, method|
base.send(:define_method, sym, method)
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems