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Current semantic version:

[com.taoensso/nippy "0.9.0"]

Nippy, a serialization library for Clojure

Clojure's rich data types are awesome. And its 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).

Nippy is an attempt to provide a drop-in, high-performance alternative to the reader. It's a fork of Deep-Freeze and is used as the Carmine Redis client serializer.

What's In The Box?

Simple, high-performance all-Clojure de/serializer.
Comprehesive, extensible support for all major data types.
Reader-fallback for difficult/future types.
Full test coverage for every supported type.
Snappy integrated de/compression for efficient storage and network transfer.

Status

Nippy is still currently experimental. It has not yet been thoroughly tested in production and its API is subject to change. To run tests against all supported Clojure versions, use:

lein2 all test

Known issue with Java 7 on OSX

Nippy uses Snappy which currently has a minor path issue with Java 7 on OSX. Please see here for a workaround until a proper fix is available.

Getting Started

Leiningen

Depend on Nippy in your project.clj:

[com.taoensso/nippy "0.9.0"]

and require the library:

(ns my-app (:require [taoensso.nippy :as nippy]))

De/Serializing

As an example of what Nippy can do, let's take a look at its own reference stress data:

nippy/stress-data
=>
{:bytes        (byte-array [(byte 1) (byte 2) (byte 3)])
 :nil          nil
 :boolean      true

 :char-utf8    \ಬ
 :string-utf8  "ಬಾ ಇಲ್ಲಿ ಸಂಭವಿಸ"
 :string-long  (apply str (range 1000))
 :keyword      :keyword

 :list         (list 1 2 3 4 5 (list 6 7 8 (list 9 10)))
 :list-quoted  '(1 2 3 4 5 (6 7 8 (9 10)))
 :list-empty   (list)
 :vector       [1 2 3 4 5 [6 7 8 [9 10]]]
 :vector-empty []
 :map          {:a 1 :b 2 :c 3 :d {:e 4 :f {:g 5 :h 6 :i 7}}}
 :map-empty    {}
 :set          #{1 2 3 4 5 #{6 7 8 #{9 10}}}
 :set-empty    #{}
 :meta         (with-meta {:a :A} {:metakey :metaval})
 :queue        (-> (PersistentQueue/EMPTY) (conj :a :b :c :d :e :f :g))
 :queue-empty  (PersistentQueue/EMPTY)
 :coll         (repeatedly 1000 rand)

 :byte         (byte 16)
 :short        (short 42)
 :integer      (int 3)
 :long         (long 3)
 :bigint       (bigint 31415926535897932384626433832795)

 :float        (float 3.14)
 :double       (double 3.14)
 :bigdec       (bigdec 3.1415926535897932384626433832795)

 :ratio        22/7}

Serialize it:

(def frozen-stress-data (nippy/freeze-to-bytes nippy/stress-data))
=> #<byte[] [B@3253bcf3>

Deserialize it:

(nippy/thaw-from-bytes frozen-stress-data)
=> {:bytes        (byte-array [(byte 1) (byte 2) (byte 3)])
    :nil          nil
    :boolean      true
    <...> }

Couldn't be simpler!