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require 'set'
require 'thread'
require 'mustermann'
module Mustermann
# A simple, persistent cache for creating repositories.
#
# @example
# require 'mustermann/pattern_cache'
# cache = Mustermann::PatternCache.new
#
# # use this instead of Mustermann.new
# pattern = cache.create_pattern("/:name", type: :rails)
#
# @note
# {Mustermann::Pattern.new} (which is used by {Mustermann.new}) will reuse instances that have
# not yet been garbage collected. You only need an extra cache if you do not keep a reference to
# the patterns around.
#
# @api private
class PatternCache
# @param [Hash] pattern_options default options used for {#create_pattern}
def initialize(pattern_options = {})
@cached = Set.new
@mutex = Mutex.new
@pattern_options = pattern_options
end
# @param (see Mustermann.new)
# @return (see Mustermann.new)
# @raise (see Mustermann.new)
# @see Mustermann.new
def create_pattern(string, pattern_options = {})
pattern = Mustermann.new(string, @pattern_options.merge(pattern_options))
@mutex.synchronize { @cached.add(pattern) } unless @cached.include? pattern
pattern
end
# Removes all pattern instances from the cache.
def clear
@mutex.synchronize { @cached.clear }
end
# @return [Integer] number of currently cached patterns
def size
@mutex.synchronize { @cached.size }
end
end
end
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