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Versions: 9
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Stored size: 1.23 KB
Contents
require_relative "config"
#
# This is a cache module, which keeps entries for a certain time period,
# stored away in a redis store.
#
# Entries are packed via Marshal.
module App
module Cache
DEFAULT_MAX_AGE = 4 * 3600 # 4 hours.
attr :store, true
extend self
def self.clear
store.flushdb
end
def self.cached(key, max_age = DEFAULT_MAX_AGE, &block)
redis = App::Cache.store
return yield if !store || !max_age
if marshalled = store.get(key)
Marshal.load(marshalled)
else
yield.tap { |v|
store.set(key, Marshal.dump(v))
store.expire(key, max_age)
}
end
end
def self.setup
if !(cache_url = App.config[:cache])
App.logger.warn "No :cache configuration"
elsif !(self.store = connect_to_redis(cache_url))
App.logger.warn "Using cache at #{cache_url}"
end
end
def self.connect_to_redis(url)
require "redis"
Redis.connect(:url => url)
rescue LoadError
App.logger.warn "Cannot load 'redis' gem (connecting to #{url})"
nil
end
end
def cached(key, max_age = Cache::DEFAULT_MAX_AGE, &block)
Cache.cached(key, max_age, &block)
end
end
App::Cache.setup
Version data entries
9 entries across 9 versions & 1 rubygems