class GraphQL::Execution::Lazy::LazyMethodMap::ConcurrentishMap

def []=(key, value)
  @semaphore.synchronize {
    @storage[key] = value
  }
end

def compute_if_absent(key)
  @semaphore.synchronize {
    @storage.fetch(key) { @storage[key] = yield }
  }
end

def copy_storage
  @semaphore.synchronize {
    @storage.dup
  }
end

def initialize
  @semaphore = Mutex.new
  # Access to this hash must always be managed by the mutex
  # since it may be modified at runtime
  @storage = {}
end

def initialize_copy(other)
  @semaphore = Mutex.new
  @storage = other.copy_storage
end