|
# A cache store implementation which stores everything into memory.
|
|
# it keeps a time stamp, allowing auto expiry of objects
|
|
# it has a similar behaviour to memcached, but does not require memcache
|
|
# however this will not clean up automatically, only upon request
|
|
|
|
class TimedCachedStore < ActiveSupport::Cache::MemoryStore
|
|
def exist?(name, options = nil)
|
|
delete_if_expired name
|
|
super
|
|
end
|
|
|
|
def read(name)
|
|
delete_if_expired name
|
|
super
|
|
end
|
|
|
|
def write(name, value, options = nil)
|
|
if options and options[:expires_in]
|
|
time = Time.now
|
|
ttl = time + options[:expires_in].to_i
|
|
@data[ts_field(name)] = { :created_at => time, :expires_at => ttl }
|
|
end
|
|
super
|
|
end
|
|
|
|
def delete_all_expired
|
|
@data.keys.each do |key|
|
|
delete_if_expired($1) if key =~ /(\w+)_timestamp/
|
|
end
|
|
end
|
|
|
|
protected
|
|
|
|
def delete_if_expired(name)
|
|
if expired?(name)
|
|
@data[ts_field(name)] = nil
|
|
delete(name)
|
|
end
|
|
rescue
|
|
nil
|
|
end
|
|
|
|
def expired?(name)
|
|
ts = @data[ts_field(name)]
|
|
ts and (Time.now >= ts[:expires_at])
|
|
rescue
|
|
false
|
|
end
|
|
|
|
def ts_field(name)
|
|
"#{name}_timestamp"
|
|
end
|
|
end
|
