{"id":23851,"date":"2019-02-07T12:15:03","date_gmt":"2019-02-07T10:15:03","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=23851"},"modified":"2019-02-06T10:29:23","modified_gmt":"2019-02-06T08:29:23","slug":"zache-simple-ruby-memory-cache","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/ruby\/zache-simple-ruby-memory-cache\/","title":{"rendered":"Zache: A Simple Ruby In-Memory Cache"},"content":{"rendered":"\n

A month ago I stumbled upon a problem: I wasn\u2019t able to find a Ruby gem which would do in-memory caching with the capability to expire on timeout. After some quick research I decided to implement my own and called it Zache (as in \u201czero cache,\u201d since there is no back end). Here is how it works:<\/p>\n\n\n\n

First, you create the cache:<\/p>\n\n\n\n

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require<\/code> 'zache'<\/code><\/div>\n
zache = Zache.<\/code>new<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

 <\/p>\n<\/figure>\n\n\n\n

Then you fetch the value by the key, also providing the block which will be executed if the key is absent or expired:<\/p>\n\n\n\n

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1<\/div>\n
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x = zache.get(:x, lifetime: 15) <\/code>do<\/code><\/div>\n
  <\/code># Something very slow <\/code>and<\/code> expensive, which<\/code><\/div>\n
  <\/code># we only want to execute once every 15 seconds.<\/code><\/div>\n
end<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

 <\/p>\n<\/figure>\n\n\n\n

Here, :x<\/code> is the key and 15<\/code> is the number of seconds it will stay in the cache, until it expires.<\/p>\n\n\n\n

It\u2019s important to notice that the key won\u2019t be deleted from the cache automatically. It will stay there until the next call to get(:x)<\/code>. Only at that moment will it be marked as \u201cexpired.\u201d In order to clean up the cache, you can call zache.clean()<\/code> and all expired keys will be deleted.<\/p>\n\n\n\n

You can do it regularly in a separate thread, for example, every minute:<\/p>\n\n\n\n

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1<\/div>\n
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Thread.start <\/code>do<\/code><\/div>\n
  <\/code>sleep 60<\/code><\/div>\n
  <\/code>zache.clean<\/code><\/div>\n
end<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

 <\/p>\n<\/figure>\n\n\n\n

Also, Zache, of course, is thread-safe.<\/p>\n\n\n\n

The gem is in this GitHub repository<\/a>. Feel free to report bugs, if you find them, or help us with additional features.<\/p>\n\n\n\n

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\n

Published on Web Code Geeks with permission by Yegor Bugayenko, partner at our WCG program<\/a>. See the original article here: Zache: A Simple Ruby In-Memory Cache<\/a><\/p>\n

Opinions expressed by Web Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

A month ago I stumbled upon a problem: I wasn\u2019t able to find a Ruby gem which would do in-memory caching with the capability to expire on timeout. After some quick research I decided to implement my own and called it Zache (as in \u201czero cache,\u201d since there is no back end). Here is how …<\/p>\n","protected":false},"author":6534,"featured_media":4128,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"class_list":["post-23851","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ruby"],"yoast_head":"\nZache: A Simple Ruby In-Memory Cache - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn about Zache? 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