class Roda::RodaCache

each protected by a mutex.
A thread safe cache class, offering only #[] and #[]= methods,

def [](key)

Make getting value from underlying hash thread safe. 
def [](key)
  @mutex.synchronize{@hash[key]}
end

def []=(key, value)

Make setting value in underlying hash thread safe. 
def []=(key, value)
  @mutex.synchronize{@hash[key] = value}
end

def initialize

Create a new thread safe cache. 
def initialize
  @mutex = Mutex.new
  @hash = {}
end