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require 'thread'
require 'singleton'
##
# A generic, thread-safe in-memory cache. It's used for caching
# RDoc::TemplatePage objects when generating RDoc output.
class RDoc::Cache
include Singleton
##
# Creates a new, empty cache
def initialize
@contents = {}
@lock = Mutex.new
end
##
# Checks whether there's a value in the cache with key +key+. If so, then
# that value will be returned. Otherwise, the given block will be run, and
# its return value will be put into the cache, and returned.
def cache(key)
@lock.synchronize do
@contents[key] ||= yield
end
end
##
# Clears the contents of the cache
def clear
@lock.synchronize do
@contents.clear
end
end
end
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