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Merge branch 'dev': v0.9.0.

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*.jar
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language: clojure
lein: lein2
script: lein2 all test
jdk:
- openjdk7
- openjdk6
- oraclejdk7

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nippy
=====
Current [semantic](http://semver.org/) version:
TODO: serialization lib
```clojure
[com.taoensso/nippy "0.9.0"]
```
# Nippy, a serialization library for Clojure
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).
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.
## 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](http://code.google.com/p/snappy/) **integrated de/compression** for efficient storage and network transfer.
## Status [![Build Status](https://secure.travis-ci.org/ptaoussanis/nippy.png?branch=master)](http://travis-ci.org/ptaoussanis/nippy)
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:
```bash
lein2 all test
```
### Known issue with Java 7 on OSX
Nippy uses [Snappy](http://code.google.com/p/snappy-java/) which currently has a minor path issue with Java 7 on OSX. Please see [here](https://github.com/ptaoussanis/carmine/issues/5#issuecomment-6450607) for a workaround until a proper fix is available.
## Getting Started
### Leiningen
Depend on Nippy in your `project.clj`:
```clojure
[com.taoensso/nippy "0.9.0"]
```
and `require` the library:
```clojure
(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:
```clojure
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:
```clojure
(def frozen-stress-data (nippy/freeze-to-bytes nippy/stress-data))
=> #<byte[] [B@3253bcf3>
```
Deserialize it:
```clojure
(nippy/thaw-from-bytes frozen-stress-data)
=> {:bytes (byte-array [(byte 1) (byte 2) (byte 3)])
:nil nil
:boolean true
<...> }
```
Couldn't be simpler!
## Performance
![Performance comparison chart](https://github.com/ptaoussanis/nippy/raw/master/benchmarks/chart1.png)
![Data size chart](https://github.com/ptaoussanis/nippy/raw/master/benchmarks/chart2.png)
[Detailed benchmark information](https://docs.google.com/spreadsheet/ccc?key=0AuSXb68FH4uhdE5kTTlocGZKSXppWG9sRzA5Y2pMVkE&pli=1#gid=0) is available on Google Docs.
## Nippy supports the ClojureWerkz Project Goals
ClojureWerkz is a growing collection of open-source, batteries-included [Clojure libraries](http://clojurewerkz.org/) that emphasise modern targets, great documentation, and thorough testing.
## Contact & Contribution
Reach me (Peter Taoussanis) at *ptaoussanis at gmail.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).
## License
Copyright &copy; 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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(ns taoensso.nippy.benchmarks
{:author "Peter Taoussanis"}
(:use [taoensso.nippy :as nippy :only (freeze-to-bytes thaw-from-bytes)]))
;; Remove stuff from stress-data that breaks reader
(def bench-data (dissoc nippy/stress-data :queue :queue-empty :bytes))
(defn reader-freeze [x] (binding [*print-dup* false] (pr-str x)))
(defn reader-thaw [x] (binding [*read-eval* false] (read-string x)))
(def roundtrip (comp thaw-from-bytes freeze-to-bytes))
(def reader-roundtrip (comp reader-thaw reader-freeze))
(defmacro time-requests
"Warms up, then executes given number of requests and returns total execution
times in msecs."
[num-requests & body]
`(do (dotimes [_# (int (/ ~num-requests 4))] ~@body) ; Warm-up
(let [start-time# (System/nanoTime)]
(dotimes [_# ~num-requests] ~@body)
(Math/round (/ (- (System/nanoTime) start-time#) 1000000.0)))))
(comment
;;; Times
(println
"---\n"
(let [num 10000]
{:reader {:freeze (time-requests num (reader-freeze bench-data))
:thaw (let [frozen (reader-freeze bench-data)]
(time-requests num (reader-thaw frozen)))
:round (time-requests num (reader-roundtrip bench-data))}
:nippy {:freeze (time-requests num (freeze-to-bytes bench-data))
:thaw (let [frozen (freeze-to-bytes bench-data)]
(time-requests num (thaw-from-bytes frozen)))
:round (time-requests num (roundtrip bench-data))}}))
;; Clojure 1.3.0, Nippy 0.9.0
;; {:reader {:freeze 23573, :thaw 31923, :round 53253},
;; :nippy {:freeze 3805, :thaw 3789, :round 7522}}
;; (float (/ 53253 7522)) = 7.079633
;;; Data size
(let [frozen (reader-freeze bench-data)] (count (.getBytes frozen "UTF8")))
(let [frozen (freeze-to-bytes bench-data)] (count frozen))
;; 22711, 12168
)

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(defproject com.taoensso/nippy "0.9.0"
:description "Simple, high-performance Clojure serialization library."
:url "https://github.com/ptaoussanis/nippy"
:license {:name "Eclipse Public License"}
:dependencies [[org.clojure/clojure "1.3.0"]
[org.xerial.snappy/snappy-java "1.0.4.1"]]
:profiles {:1.3 {:dependencies [[org.clojure/clojure "1.3.0"]]}
:1.4 {:dependencies [[org.clojure/clojure "1.4.0"]]}
:1.5 {:dependencies [[org.clojure/clojure "1.5.0-master-SNAPSHOT"]]}
:dev {:dependencies []}}
:repositories {"sonatype" {:url "http://oss.sonatype.org/content/repositories/releases"
:snapshots false
:releases {:checksum :fail :update :always}}
"sonatype-snapshots" {:url "http://oss.sonatype.org/content/repositories/snapshots"
:snapshots true
:releases {:checksum :fail :update :always}}}
:aliases {"all" ["with-profile" "1.3:1.4:1.5"]}
:min-lein-version "2.0.0"
:warn-on-reflection true)

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(ns taoensso.nippy
"Simple, high-performance Clojure serialization library. Adapted from
Deep-Freeze."
{:author "Peter Taoussanis"}
(:require [taoensso.nippy.utils :as utils])
(:import [java.io DataInputStream DataOutputStream ByteArrayOutputStream
ByteArrayInputStream]
[org.xerial.snappy Snappy]
[clojure.lang IPersistentList IPersistentVector IPersistentMap
IPersistentSet PersistentQueue IPersistentCollection Keyword
BigInt Ratio]))
;;;; Define type IDs
(def ^:const schema-header "\u0000~0.9.0")
(def ^:const id-reader (int 1)) ; Fallback: *print-dup* pr-str output
(def ^:const id-bytes (int 2))
(def ^:const id-nil (int 3))
(def ^:const id-boolean (int 4))
(def ^:const id-char (int 10))
(def ^:const id-string (int 11))
(def ^:const id-keyword (int 12))
(def ^:const id-list (int 20))
(def ^:const id-vector (int 21))
(def ^:const id-old-map (int 22)) ; DEPRECATED as of 0.9.0
(def ^:const id-set (int 23))
(def ^:const id-coll (int 24)) ; Fallback: non-specific collection
(def ^:const id-meta (int 25))
(def ^:const id-queue (int 26))
(def ^:const id-map (int 27))
(def ^:const id-byte (int 40))
(def ^:const id-short (int 41))
(def ^:const id-integer (int 42))
(def ^:const id-long (int 43))
(def ^:const id-bigint (int 44))
(def ^:const id-float (int 60))
(def ^:const id-double (int 61))
(def ^:const id-bigdec (int 62))
(def ^:const id-ratio (int 70))
;;;; Shared low-level stream stuff
(defn- write-id! [^DataOutputStream stream ^Integer id] (.writeByte stream id))
(defn- write-bytes!
[^DataOutputStream stream ^bytes ba]
(let [size (alength ba)]
(.writeInt stream size) ; Encode size of byte array
(.write stream ba 0 size)))
(defn- read-bytes!
^bytes [^DataInputStream stream]
(let [size (.readInt stream)
ba (byte-array size)]
(.read stream ba 0 size) ba))
(defn- write-as-bytes!
"Write arbitrary object as bytes using reflection."
[^DataOutputStream stream obj]
(write-bytes! stream (.toByteArray obj)))
(defn- read-biginteger!
"Wrapper around read-bytes! for common case of reading to a BigInteger.
Note that as of Clojure 1.3, java.math.BigInteger ≠ clojure.lang.BigInt."
^BigInteger [^DataInputStream stream]
(BigInteger. (read-bytes! stream)))
;;;; Freezing
(defprotocol Freezable (freeze [this stream]))
(comment (meta '^:DataOutputStream s))
(defmacro freezer
"Helper to extend Freezable protocol."
[type id & body]
`(extend-type ~type
~'Freezable
(~'freeze [~'x ~(with-meta 's {:tag 'DataOutputStream})]
(write-id! ~'s ~id)
~@body)))
(defmacro coll-freezer
"Helper to freeze simple collection types."
[type id & body]
`(freezer
~type ~id
(.writeInt ~'s (count ~'x)) ; Encode collection length
(doseq [i# ~'x] (freeze-to-stream!* ~'s i#))))
(freezer (Class/forName "[B") id-bytes (write-bytes! s x))
(freezer nil id-nil)
(freezer Boolean id-boolean (.writeBoolean s x))
(freezer Character id-char (.writeChar s (int x)))
(freezer String id-string (.writeUTF s x))
(freezer Keyword id-keyword (.writeUTF s (name x)))
(declare freeze-to-stream!*)
(coll-freezer IPersistentList id-list)
(coll-freezer IPersistentVector id-vector)
(freezer IPersistentMap id-map
(.writeInt s (* 2 (count x))) ; Encode num kvs
(doseq [[k v] x]
(freeze-to-stream!* s k)
(freeze-to-stream!* s v)))
(coll-freezer IPersistentSet id-set)
(coll-freezer PersistentQueue id-queue)
(coll-freezer IPersistentCollection id-coll) ; Must be LAST collection freezer!
(freezer Byte id-byte (.writeByte s x))
(freezer Short id-short (.writeShort s x))
(freezer Integer id-integer (.writeInt s x))
(freezer Long id-long (.writeLong s x))
(freezer BigInt id-bigint (write-as-bytes! s (.toBigInteger x)))
(freezer BigInteger id-bigint (write-as-bytes! s x))
(freezer Float id-float (.writeFloat s x))
(freezer Double id-double (.writeDouble s x))
(freezer BigDecimal id-bigdec
(write-as-bytes! s (.unscaledValue x))
(.writeInt s (.scale x)))
(freezer Ratio id-ratio
(write-as-bytes! s (.numerator x))
(write-as-bytes! s (.denominator x)))
;; Use Clojure's own reader as final fallback
(freezer Object id-reader (.writeUTF s (pr-str x)))
(defn- freeze-to-stream!* [^DataOutputStream s x]
(if-let [m (meta x)]
(do (write-id! s id-meta)
(freeze-to-stream!* s m)))
(freeze x s))
(defn freeze-to-stream!
"Serializes x to given output stream."
[data-output-stream x]
(binding [*print-dup* true] ; For `pr-str`
(freeze-to-stream!* data-output-stream schema-header)
(freeze-to-stream!* data-output-stream x)))
(defn freeze-to-bytes
"Serializes x to a byte array and returns the array."
(^bytes [x] (freeze-to-bytes x true))
(^bytes [x compress?]
(let [ba (ByteArrayOutputStream.)
stream (DataOutputStream. ba)]
(freeze-to-stream! stream x)
(let [ba (.toByteArray ba)]
(if compress? (Snappy/compress ba) ba)))))
;;;; Thawing
(declare thaw-from-stream!*)
(defn coll-thaw!
"Helper to thaw simple collection types."
[^DataInputStream s]
(repeatedly (.readInt s) (partial thaw-from-stream!* s)))
(defn- thaw-from-stream!*
[^DataInputStream s]
(let [type-id (.readByte s)]
(utils/case-eval
type-id
id-reader (read-string (.readUTF s))
id-bytes (read-bytes! s)
id-nil nil
id-boolean (.readBoolean s)
id-char (.readChar s)
id-string (.readUTF s)
id-keyword (keyword (.readUTF s))
id-list (apply list (coll-thaw! s))
id-vector (into [] (coll-thaw! s))
id-set (into #{} (coll-thaw! s))
id-map (apply hash-map (coll-thaw! s))
id-coll (doall (coll-thaw! s))
id-queue (into (PersistentQueue/EMPTY) (coll-thaw! s))
;; DEPRECATED as of 0.9.0
id-old-map (apply hash-map (repeatedly (* 2 (.readInt s))
(partial thaw-from-stream!* s)))
id-meta (let [m (thaw-from-stream!* s)] (with-meta (thaw-from-stream!* s) m))
id-byte (.readByte s)
id-short (.readShort s)
id-integer (.readInt s)
id-long (.readLong s)
id-bigint (bigint (read-biginteger! s))
id-float (.readFloat s)
id-double (.readDouble s)
id-bigdec (BigDecimal. (read-biginteger! s) (.readInt s))
id-ratio (/ (bigint (read-biginteger! s))
(bigint (read-biginteger! s)))
(throw (Exception. (str "Failed to thaw unknown type ID: " type-id))))))
;; TODO Scheduled for Carmine version 1.0.0
;; (defn thaw-from-stream!
;; "Deserializes an object from given input stream."
;; [data-input-stream]
;; (binding [*read-eval* false] ; For `read-string` injection safety - NB!!!
;; (let [schema-header (thaw-from-stream!* data-input-stream)]
;; (thaw-from-stream!* data-input-stream))))
;; DEPRECATED: Includes temporary support for older versions of serialization
;; schema that didn't include a version header. This is for people that used
;; Carmine < 0.8.3 and haven't yet migrated their databases.
(defn thaw-from-stream!
"Deserializes an object from given input stream."
[data-input-stream]
(binding [*read-eval* false] ; For `read-string` injection safety - NB!!!
(let [maybe-schema-header (thaw-from-stream!* data-input-stream)]
(if (and (string? maybe-schema-header)
(.startsWith ^String maybe-schema-header "\u0000~"))
(thaw-from-stream!* data-input-stream)
maybe-schema-header))))
(defn thaw-from-bytes
"Deserializes an object from given byte array."
([ba] (thaw-from-bytes ba true))
([ba compressed?]
(->> (if compressed? (Snappy/uncompress ba) ba)
(ByteArrayInputStream.)
(DataInputStream.)
(thaw-from-stream!))))
(def stress-data
"Reference data used for tests & benchmarks."
{;; Breaks reader, roundtrip equality
: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})
;; Breaks reader
: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})

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src/taoensso/nippy/utils.clj Normal file
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(ns taoensso.nippy.utils
{:author "Peter Taoussanis"})
(defmacro case-eval
"Like `case` but evaluates test constants for their compile-time value."
[e & clauses]
(let [;; Don't evaluate default expression!
default (when (odd? (count clauses)) (last clauses))
clauses (if default (butlast clauses) clauses)]
`(case ~e
~@(map-indexed (fn [i# form#] (if (even? i#) (eval form#) form#))
clauses)
~(when default default))))

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test/test_nippy/main.clj Normal file
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(ns test-nippy.main
(:use [clojure.test])
(:require [taoensso.nippy :as nippy]))
;; Remove stuff from stress-data that breaks roundtrip equality
(def test-data (dissoc nippy/stress-data :bytes))
(def roundtrip (comp nippy/thaw-from-bytes nippy/freeze-to-bytes))
(deftest test-roundtrip (is (= test-data (roundtrip test-data))))