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v2.11.0
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v2.13.0-RC1
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<html><head><meta charset="UTF-8" /><title>taoensso.nippy documentation</title><link rel="stylesheet" type="text/css" href="css/default.css" /><link rel="stylesheet" type="text/css" href="css/highlight.css" /><script type="text/javascript" src="js/highlight.min.js"></script><script type="text/javascript" src="js/jquery.min.js"></script><script type="text/javascript" src="js/page_effects.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body><div id="header"><h2>Generated by <a href="https://github.com/weavejester/codox">Codox</a></h2><h1><a href="index.html"><span class="project-title"><span class="project-name">Nippy</span> <span class="project-version">2.13.0-RC1</span></span></a></h1></div><div class="sidebar primary"><h3 class="no-link"><span class="inner">Project</span></h3><ul class="index-link"><li class="depth-1 "><a href="index.html"><div class="inner">Index</div></a></li></ul><h3 class="no-link"><span class="inner">Namespaces</span></h3><ul><li class="depth-1"><div class="no-link"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>taoensso</span></div></div></li><li class="depth-2 current"><a href="taoensso.nippy.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>nippy</span></div></a></li><li class="depth-3 branch"><a href="taoensso.nippy.benchmarks.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>benchmarks</span></div></a></li><li class="depth-3 branch"><a href="taoensso.nippy.compression.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>compression</span></div></a></li><li class="depth-3 branch"><a href="taoensso.nippy.encryption.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>encryption</span></div></a></li><li class="depth-3 branch"><a href="taoensso.nippy.tools.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>tools</span></div></a></li><li class="depth-3"><a href="taoensso.nippy.utils.html"><div class="inner"><span class="tree"><span class="top"></span><span class="bottom"></span></span><span>utils</span></div></a></li></ul></div><div class="sidebar secondary"><h3><a href="#top"><span class="inner">Public Vars</span></a></h3><ul><li class="depth-1"><a href="taoensso.nippy.html#var-*auto-freeze-compressor*"><div class="inner"><span>*auto-freeze-compressor*</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-*custom-readers*"><div class="inner"><span>*custom-readers*</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-*final-freeze-fallback*"><div class="inner"><span>*final-freeze-fallback*</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-*freeze-fallback*"><div class="inner"><span>*freeze-fallback*</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var--cache-proxy"><div class="inner"><span>-cache-proxy</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-aes128-encryptor"><div class="inner"><span>aes128-encryptor</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-cache"><div class="inner"><span>cache</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-compress"><div class="inner"><span>compress</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-decompress"><div class="inner"><span>decompress</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-decrypt"><div class="inner"><span>decrypt</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-encrypt"><div class="inner"><span>encrypt</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-extend-freeze"><div class="inner"><span>extend-freeze</span></div></a></li><li class="depth-1"><a href="taoensso.nippy.html#var-extend-thaw"><div class="inner"><span>extend-t
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</pre></div><div class="public anchor" id="var-*auto-freeze-compressor*"><h3>*auto-freeze-compressor*</h3><h4 class="dynamic">dynamic</h4><div class="usage"></div><div class="doc"><pre class="plaintext">(fn [byte-array])-&gt;compressor used by `(freeze &lt;x&gt; {:compressor :auto}),
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nil =&gt; default</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L253">view source</a></div></div><div class="public anchor" id="var-*custom-readers*"><h3>*custom-readers*</h3><h4 class="dynamic">dynamic</h4><div class="usage"></div><div class="doc"><pre class="plaintext">{&lt;hash-or-byte-id&gt; (fn [data-input])}
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L252">view source</a></div></div><div class="public anchor" id="var-*final-freeze-fallback*"><h3>*final-freeze-fallback*</h3><h4 class="dynamic">dynamic</h4><div class="usage"></div><div class="doc"><pre class="plaintext">DEPRECATED
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1576">view source</a></div></div><div class="public anchor" id="var-*freeze-fallback*"><h3>*freeze-fallback*</h3><h4 class="dynamic">dynamic</h4><div class="usage"></div><div class="doc"><pre class="plaintext">(fn [data-output x]), nil =&gt; default
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L251">view source</a></div></div><div class="public anchor" id="var--cache-proxy"><h3>-cache-proxy</h3><div class="usage"></div><div class="doc"><pre class="plaintext">{[&lt;x&gt; &lt;meta&gt;] &lt;idx&gt;} for freezing, {&lt;idx&gt; &lt;x-with-meta&gt;} for thawing.
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L745">view source</a></div></div><div class="public anchor" id="var-aes128-encryptor"><h3>aes128-encryptor</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Default 128bit AES encryptor with many-round SHA-512 key-gen.
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Password form [:salted "my-password"]
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---------------------------------------
USE CASE: You want more than a small, finite number of passwords (e.g. each
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item encrypted will use a unique user-provided password).
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IMPLEMENTATION: Uses a relatively cheap key hash, but automatically salts
every key.
PROS: Each key is independent so would need to be attacked independently.
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CONS: Key caching impossible, so there's an inherent trade-off between
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encryption/decryption speed and the difficulty of attacking any
particular key.
Slower than `aes128-cached`, and easier to attack any particular key - but
keys are independent.
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Password form [:cached "my-password"]
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---------------------------------------
USE CASE: You want only a small, finite number of passwords (e.g. a limited
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number of staff/admins, or you'll be using a single password to
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encrypt many items).
IMPLEMENTATION: Uses a _very_ expensive (but cached) key hash, and no salt.
PROS: Great amortized encryption/decryption speed. Expensive key hash makes
attacking any particular key very difficult.
CONS: Using a small number of keys for many encrypted items means that if any
key _is_ somehow compromised, _all_ items encrypted with that key are
compromised.
Faster than `aes128-salted`, and harder to attack any particular key - but
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increased danger if a key is somehow compromised.</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L242">view source</a></div></div><div class="public anchor" id="var-cache"><h3>cache</h3><div class="usage"><code>(cache x)</code></div><div class="doc"><pre class="plaintext">Experimental, subject to change.
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Wraps value so that future writes of the same wrapped value with same
metadata will be efficiently encoded as references to this one.
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(freeze [(cache "foo") (cache "foo") (cache "foo")])
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will incl. a single "foo", plus 2x single-byte references to "foo".</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L764">view source</a></div></div><div class="public anchor" id="var-compress"><h3>compress</h3><div class="usage"><code>(compress compressor ba)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L233">view source</a></div></div><div class="public anchor" id="var-decompress"><h3>decompress</h3><div class="usage"><code>(decompress compressor ba)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L234">view source</a></div></div><div class="public anchor" id="var-decrypt"><h3>decrypt</h3><div class="usage"><code>(decrypt encryptor pwd ba)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L241">view source</a></div></div><div class="public anchor" id="var-encrypt"><h3>encrypt</h3><div class="usage"><code>(encrypt encryptor pwd ba)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L240">view source</a></div></div><div class="public anchor" id="var-extend-freeze"><h3>extend-freeze</h3><h4 class="type">macro</h4><div class="usage"><code>(extend-freeze type custom-type-id [x out] &amp; body)</code></div><div class="doc"><pre class="plaintext">Extends Nippy to support freezing of a custom type (ideally concrete) with
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given id of form:
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* Keyword - 2 byte overhead, resistent to id collisions
* Integer ∈[1, 128] - no overhead, subject to id collisions
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NB: be careful about extending to interfaces, Ref. <a href="http://goo.gl/6gGRlU">http://goo.gl/6gGRlU</a>.
(defrecord MyRec [data])
(extend-freeze MyRec :foo/my-type [x data-output] ; Keyword id
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(.writeUTF [data-output] (:data x)))
;; or
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(extend-freeze MyRec 1 [x data-output] ; Byte id
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(.writeUTF [data-output] (:data x)))</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1412">view source</a></div></div><div class="public anchor" id="var-extend-thaw"><h3>extend-thaw</h3><h4 class="type">macro</h4><div class="usage"><code>(extend-thaw custom-type-id [in] &amp; body)</code></div><div class="doc"><pre class="plaintext">Extends Nippy to support thawing of a custom type with given id:
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(extend-thaw :foo/my-type [data-input] ; Keyword id
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(MyRec. (.readUTF data-input)))
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;; or
(extend-thaw 1 [data-input] ; Byte id
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(MyRec. (.readUTF data-input)))</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1438">view source</a></div></div><div class="public anchor" id="var-fast-freeze"><h3>fast-freeze</h3><div class="usage"><code>(fast-freeze x)</code></div><div class="doc"><pre class="plaintext">Like `freeze` but:
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- Writes data without a Nippy header
- Drops all support for compression and encryption
- Must be thawed with `fast-thaw`
Equivalent to (but a little faster than):
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`(freeze x {:compressor nil :encryptor nil :no-header? true})</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L943">view source</a></div></div><div class="public anchor" id="var-fast-thaw"><h3>fast-thaw</h3><div class="usage"><code>(fast-thaw ba)</code></div><div class="doc"><pre class="plaintext">Like `thaw` but:
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- Drops all support for compression and encryption
- Supports only data frozen with `fast-freeze`
Equivalent to (but a little faster than):
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`(thaw x {:compressor nil :encryptor nil :no-header? true})</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1280">view source</a></div></div><div class="public anchor" id="var-freezable.3F"><h3>freezable?</h3><div class="usage"><code>(freezable? x)</code><code>(freezable? x {:keys [allow-clojure-reader? allow-java-serializable?]})</code></div><div class="doc"><pre class="plaintext">Alpha - subject to change.
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Returns truthy iff Nippy *appears* to support freezing the given argument.
`:allow-clojure-reader?` and `:allow-java-serializable?` options may be
used to enable the relevant roundtrip fallback test(s). These tests are
only **moderately reliable** since they're cached by arg type and don't
test for pre/post serialization value equality (there's no good general
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way of doing so).</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L244">view source</a></div></div><div class="public anchor" id="var-freeze"><h3>freeze</h3><div class="usage"><code>(freeze x)</code><code>(freeze x {:keys [compressor encryptor password], :or {compressor :auto, encryptor aes128-encryptor}, :as opts})</code></div><div class="doc"><pre class="plaintext">Serializes arg (any Clojure data type) to a byte array. To freeze custom
types, extend the Clojure reader or see `extend-freeze`.</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L957">view source</a></div></div><div class="public anchor" id="var-freeze-fallback-as-str"><h3>freeze-fallback-as-str</h3><div class="usage"></div><div class="doc"><pre class="plaintext">DEPRECATED
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1577">view source</a></div></div><div class="public anchor" id="var-freeze-to-out.21"><h3>freeze-to-out!</h3><div class="usage"><code>(freeze-to-out! data-output x)</code></div><div class="doc"><pre class="plaintext">Serializes arg (any Clojure data type) to a DataOutput.
This is a low-level util: in most cases you'll want `freeze` instead.</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L724">view source</a></div></div><div class="public anchor" id="var-IFreezable1"><h3>IFreezable1</h3><h4 class="type">protocol</h4><div class="usage"></div><div class="doc"><pre class="plaintext"></pre></div><div class="members"><h4>members</h4><div class="inner"><div class="public anchor" id="var--freeze-without-meta.21"><h3>-freeze-without-meta!</h3><div class="usage"><code>(-freeze-without-meta! x data-output)</code></div><div class="doc"><pre class="plaintext"></pre></div></div></div></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L313">view source</a></div></div><div class="public anchor" id="var-IFreezable2"><h3>IFreezable2</h3><h4 class="type">protocol</h4><div class="usage"></div><div class="doc"><pre class="plaintext"></pre></div><div class="members"><h4>members</h4><div class="inner"><div class="public anchor" id="var--freeze-with-meta.21"><h3>-freeze-with-meta!</h3><div class="usage"><code>(-freeze-with-meta! x data-output)</code></div><div class="doc"><pre class="plaintext"></pre></div></div></div></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L314">view source</a></div></div><div class="public anchor" id="var-inspect-ba"><h3>inspect-ba</h3><div class="usage"><code>(inspect-ba ba)</code><code>(inspect-ba ba thaw-opts)</code></div><div class="doc"><pre class="plaintext">Alpha - subject to change
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1545">view source</a></div></div><div class="public anchor" id="var-lz4-compressor"><h3>lz4-compressor</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Default net.jpountz.lz4 compressor:
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Ratio: low.
Write speed: very high.
Read speed: very high.
A good general-purpose compressor, competitive with Snappy.
Thanks to Max Penet (@mpenet) for our first implementation,
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Ref. <a href="https://github.com/mpenet/nippy-lz4">https://github.com/mpenet/nippy-lz4</a></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L237">view source</a></div></div><div class="public anchor" id="var-lz4hc-compressor"><h3>lz4hc-compressor</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Like `lz4-compressor` but trades some write speed for ratio.
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L238">view source</a></div></div><div class="public anchor" id="var-lzma2-compressor"><h3>lzma2-compressor</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Default org.tukaani.xz.LZMA2 compressor:
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Ratio: high.
Write speed: _very_ slow (also currently single-threaded).
Read speed: slow.
A specialized compressor for large, low-write data in space-sensitive
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environments.</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L236">view source</a></div></div><div class="public anchor" id="var-set-auto-freeze-compressor.21"><h3>set-auto-freeze-compressor!</h3><div class="usage"><code>(set-auto-freeze-compressor! x)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L259">view source</a></div></div><div class="public anchor" id="var-set-freeze-fallback.21"><h3>set-freeze-fallback!</h3><div class="usage"><code>(set-freeze-fallback! x)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L258">view source</a></div></div><div class="public anchor" id="var-snappy-compressor"><h3>snappy-compressor</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Default org.iq80.snappy.Snappy compressor:
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Ratio: low.
Write speed: very high.
Read speed: very high.
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A good general-purpose compressor.</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L235">view source</a></div></div><div class="public anchor" id="var-stress-data"><h3>stress-data</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Reference data used for tests &amp; benchmarks
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1468">view source</a></div></div><div class="public anchor" id="var-stress-data-benchable"><h3>stress-data-benchable</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Reference data with stuff removed that breaks reader or other utils we'll
be benching against</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1536">view source</a></div></div><div class="public anchor" id="var-stress-data-comparable"><h3>stress-data-comparable</h3><div class="usage"></div><div class="doc"><pre class="plaintext">Reference data with stuff removed that breaks roundtrip equality
</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1532">view source</a></div></div><div class="public anchor" id="var-swap-custom-readers.21"><h3>swap-custom-readers!</h3><div class="usage"><code>(swap-custom-readers! f)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L260">view source</a></div></div><div class="public anchor" id="var-thaw"><h3>thaw</h3><div class="usage"><code>(thaw ba)</code><code>(thaw ba {:keys [v1-compatibility? compressor encryptor password], :or {compressor :auto, encryptor :auto}, :as opts})</code></div><div class="doc"><pre class="plaintext">Deserializes a frozen Nippy byte array to its original Clojure data type.
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To thaw custom types, extend the Clojure reader or see `extend-thaw`.
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2015-12-01 06:06:24 +00:00
** By default, supports data frozen with Nippy v2+ ONLY **
Add `{:v1-compatibility? true}` option to support thawing of data frozen with
legacy versions of Nippy.
v2.7.0-alpha1
2014-07-06 06:37:03 +00:00
Options include:
v2.11.0-alpha1
2015-12-01 06:06:24 +00:00
:v1-compatibility? - support data frozen by legacy versions of Nippy?
:compressor - :auto (checks header, default) an ICompressor, or nil
v2.13.0-RC1
2016-12-17 11:26:10 +00:00
:encryptor - :auto (checks header, default), an IEncryptor, or nil</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1291">view source</a></div></div><div class="public anchor" id="var-thaw-from-in.21"><h3>thaw-from-in!</h3><div class="usage"><code>(thaw-from-in! data-input)</code></div><div class="doc"><pre class="plaintext">Deserializes a frozen object from given DataInput to its original Clojure
v2.12.0-RC2
2016-07-17 08:48:36 +00:00
data type.
v2.13.0-RC1
2016-12-17 11:26:10 +00:00
This is a low-level util: in most cases you'll want `thaw` instead.</pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L1107">view source</a></div></div><div class="public anchor" id="var-throw-unfreezable"><h3>throw-unfreezable</h3><div class="usage"><code>(throw-unfreezable x)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L717">view source</a></div></div><div class="public anchor" id="var-try-write-readable"><h3>try-write-readable</h3><div class="usage"><code>(try-write-readable out x)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L696">view source</a></div></div><div class="public anchor" id="var-try-write-serializable"><h3>try-write-serializable</h3><div class="usage"><code>(try-write-serializable out x)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L689">view source</a></div></div><div class="public anchor" id="var-write-id"><h3>write-id</h3><h4 class="type">macro</h4><div class="usage"><code>(write-id out id)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L299">view source</a></div></div><div class="public anchor" id="var-write-unfreezable"><h3>write-unfreezable</h3><div class="usage"><code>(write-unfreezable out x)</code></div><div class="doc"><pre class="plaintext"></pre></div><div class="src-link"><a href="https://github.com/ptaoussanis/nippy/blob/master/src/taoensso/nippy.clj#L711">view source</a></div></div></div></body></html>
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