128 lines
4.2 KiB
Markdown
128 lines
4.2 KiB
Markdown
Current [semantic](http://semver.org/) version:
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```clojure
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[com.taoensso/nippy "1.2.0"]
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```
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# Nippy, a Clojure serialization library
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Clojure's [rich data types](http://clojure.org/datatypes) are *awesome*. And its [reader](http://clojure.org/reader) allows you to take your data just about anywhere. But the reader can be painfully slow when you've got a lot of data to crunch (like when you're serializing to a database).
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Nippy is an attempt to provide a drop-in, high-performance alternative to the reader. It's a fork of [Deep-Freeze](https://github.com/halgari/deep-freeze) and is used as the [Carmine Redis client](https://github.com/ptaoussanis/carmine) serializer.
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## What's In The Box?
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* Small, uncomplicated **all-Clojure** library.
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* **Good performance**.
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* Comprehesive, extensible **support for all major data types**.
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* **Reader-fallback** for difficult/future types (including Clojure 1.4+ tagged literals).
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* **Full test coverage** for every supported type.
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* [Snappy](http://code.google.com/p/snappy/) **integrated de/compression** for efficient storage and network transfer.
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## Getting Started
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### Leiningen
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Depend on Nippy in your `project.clj`:
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```clojure
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[com.taoensso/nippy "1.2.0"]
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```
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and `require` the library:
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```clojure
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(ns my-app (:require [taoensso.nippy :as nippy]))
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```
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### De/Serializing
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As an example of what Nippy can do, let's take a look at its own reference stress data:
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```clojure
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nippy/stress-data
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=>
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{:bytes (byte-array [(byte 1) (byte 2) (byte 3)])
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:nil nil
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:boolean true
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:char-utf8 \ಬ
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:string-utf8 "ಬಾ ಇಲ್ಲಿ ಸಂಭವಿಸ"
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:string-long (apply str (range 1000))
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:keyword :keyword
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:ns-keyword ::keyword
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:queue (-> (PersistentQueue/EMPTY) (conj :a :b :c :d :e :f :g))
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:queue-empty (PersistentQueue/EMPTY)
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:sorted-set (sorted-set 1 2 3 4 5)
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:sorted-map (sorted-map :b 2 :a 1 :d 4 :c 3)
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:list (list 1 2 3 4 5 (list 6 7 8 (list 9 10)))
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:list-quoted '(1 2 3 4 5 (6 7 8 (9 10)))
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:list-empty (list)
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:vector [1 2 3 4 5 [6 7 8 [9 10]]]
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:vector-empty []
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:map {:a 1 :b 2 :c 3 :d {:e 4 :f {:g 5 :h 6 :i 7}}}
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:map-empty {}
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:set #{1 2 3 4 5 #{6 7 8 #{9 10}}}
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:set-empty #{}
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:meta (with-meta {:a :A} {:metakey :metaval})
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:coll (repeatedly 1000 rand)
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:byte (byte 16)
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:short (short 42)
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:integer (int 3)
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:long (long 3)
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:bigint (bigint 31415926535897932384626433832795)
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:float (float 3.14)
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:double (double 3.14)
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:bigdec (bigdec 3.1415926535897932384626433832795)
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:ratio 22/7
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;; Clojure 1.4+
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;; :tagged-uuid (java.util.UUID/randomUUID)
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;; :tagged-date (java.util.Date.)
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}
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```
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Serialize it:
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```clojure
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(def frozen-stress-data (nippy/freeze-to-bytes nippy/stress-data))
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=> #<byte[] [B@3253bcf3>
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```
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Deserialize it:
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```clojure
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(nippy/thaw-from-bytes frozen-stress-data)
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=> {:bytes (byte-array [(byte 1) (byte 2) (byte 3)])
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:nil nil
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:boolean true
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<...> }
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```
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Couldn't be simpler!
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## Performance
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[Detailed benchmark information](https://docs.google.com/spreadsheet/ccc?key=0AuSXb68FH4uhdE5kTTlocGZKSXppWG9sRzA5Y2pMVkE&pli=1#gid=0) is available on Google Docs.
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## Nippy Supports the ClojureWerkz and CDS Project Goals
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ClojureWerkz is a growing collection of open-source, batteries-included [Clojure libraries](http://clojurewerkz.org/) that emphasise modern targets, great documentation, and thorough testing.
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CDS (Clojure Documentation Site) is a contributor-friendly community project aimed at producing top-notch [Clojure tutorials](http://clojure-doc.org/) and documentation.
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## Contact & Contribution
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Reach me (Peter Taoussanis) at [taoensso.com](https://www.taoensso.com) for questions/comments/suggestions/whatever. I'm very open to ideas if you have any! I'm also on Twitter: [@ptaoussanis](https://twitter.com/#!/ptaoussanis).
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## License
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Copyright © 2012 Peter Taoussanis. Distributed under the [Eclipse Public License](http://www.eclipse.org/legal/epl-v10.html), the same as Clojure.
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