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Experimental optimization: zero-copy freeze mode

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This commit is contained in:
Peter Taoussanis 2015-09-29 10:44:52 +07:00
parent fa17eb3a78
commit 89c9328596
1 changed files with 33 additions and 22 deletions
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17
src/taoensso/nippy.clj
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@ -378,7 +378,6 @@
(defn- wrap-header [data-ba head-meta]
(if-let [head-ba (get-head-ba head-meta)]
;; TODO Would be nice if we could avoid the array copy here:
(encore/ba-concat head-ba data-ba)
(throw (ex-info (format "Unrecognized header meta: %s" head-meta)
{:head-meta head-meta}))))
@ -425,8 +424,19 @@
compressor (if legacy-mode? snappy-compressor compressor)
encryptor (when password (if-not legacy-mode? encryptor nil))
skip-header? (or skip-header? legacy-mode?)
zero-copy-mode? (and (nil? compressor) (nil? encryptor))
baos (ByteArrayOutputStream. 64)
dos (DataOutputStream. baos)]
(if zero-copy-mode?
(do ; Optimized case
(when-not skip-header? ; Avoid `wrap-header`'s array copy:
(let [head-ba (get-head-ba {:compressor-id nil :encryptor-id nil})]
(.write dos head-ba 0 4)))
(freeze-to-out! dos x)
(.toByteArray baos))
(do
(freeze-to-out! dos x)
(let [ba (.toByteArray baos)
@ -443,14 +453,15 @@
ba (if compressor (compress compressor ba) ba)
ba (if encryptor (encrypt encryptor password ba) ba)]
(if skip-header? ba
(if skip-header?
ba
(wrap-header ba
{:compressor-id (when-let [c compressor]
(or (compression/standard-header-ids
(compression/header-id c)) :else))
:encryptor-id (when-let [e encryptor]
(or (encryption/standard-header-ids
(encryption/header-id e)) :else))}))))))
(encryption/header-id e)) :else))}))))))))
;;;; Thawing