bool isFresh(int $timestamp) Returns true if the resource has not been updated since the given

interface ResourceInterface ResourceInterface is the interface that must be implemented by all

bool isFresh(ResourceInterface

string getResource() Return Value string The file

class FileResource implements

string getResource() Return Value string The file

interface SelfCheckingResourceInterface implements

bool isFresh(int $timestamp) Returns true if the resource has not been updated since the given

class FileExistenceResource implements

serialize()