Sha256: 026329ec17becc3b39858ce800f2937a72c3a370a1e3e5589752ebdad01c1b6e
Contents?: true
Size: 645 Bytes
Versions: 15
Compression:
Stored size: 645 Bytes
Contents
require 'thread' # Mutex
# A [LazySingleton] wraps the result of the provided block,
# which is guaranteed to be called at-most-once, even if the
# block's return value is nil.
class ::LogStash::Util::LazySingleton
def initialize(&block)
@mutex = Mutex.new
@block = block
@instantiated = false
end
def instance
unless @instantiated
@mutex.synchronize do
unless @instantiated
@instance = @block.call
@instantiated = true
end
end
end
return @instance
end
def reset!
@mutex.synchronize do
@instantiated = false
@instance = nil
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems