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writer: alloc pool lazily.

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Christopher Jeffrey 2017-09-03 00:56:15 -07:00
parent a543648310
commit 45e41b1bb4
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GPG Key ID: 8962AB9DE6666BBD
1 changed files with 8 additions and 2 deletions
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10
lib/utils/staticwriter.js
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@ -10,8 +10,10 @@ const assert = require('assert');
const encoding = require('./encoding'); const encoding = require('./encoding');
const digest = require('../crypto/digest'); const digest = require('../crypto/digest');
const POOL = Buffer.allocUnsafeSlow(100 * 1024);
const EMPTY = Buffer.alloc(0); const EMPTY = Buffer.alloc(0);
const POOLSIZE = 100 << 10;
let POOL = null;
/** /**
* Statically allocated buffer writer. * Statically allocated buffer writer.
@ -35,11 +37,15 @@ function StaticWriter(size) {
*/ */
StaticWriter.pool = function pool(size) { StaticWriter.pool = function pool(size) {
if (size <= POOL.length) { if (size <= POOLSIZE) {
if (!POOL)
POOL = Buffer.allocUnsafeSlow(POOLSIZE);
const bw = new StaticWriter(0); const bw = new StaticWriter(0);
bw.data = POOL.slice(0, size); bw.data = POOL.slice(0, size);
return bw; return bw;
} }
return new StaticWriter(size); return new StaticWriter(size);
}; };