Mercurial > hg > blitz_stable
comparison src/org/dancres/blitz/config/ReadAhead.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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-1:000000000000 | 0:3dc0c5604566 |
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1 package org.dancres.blitz.config; | |
2 | |
3 /** | |
4 * <p>When Blitz encounters a template Entry created via snapshot() it will | |
5 * attempt a readahead from disk when there are no matches obtained from the | |
6 * cache. One can specify a global default readahead for all types using <code> | |
7 * entryReposReadahead</code> which can be overidden with individual | |
8 * <code>ReadAhead</code> <code>EntryConstraint</code>s.</p> | |
9 * | |
10 * <p>Specifying a readahead size of 0 disables readahead and is an enforced | |
11 * default for those Entry types tagged for FIFO operation. Specifying any | |
12 * other positive value causes Blitz to fault in up to <code>readahead</code> | |
13 * Entry's from disk which are likely to match the <code>snapshot</code>'d | |
14 * template.</p> | |
15 * | |
16 * <p>Readahead is useful in cold start situations where the cache will be | |
17 * empty and also in cases where swapping occurs but Entry's are accessed in | |
18 * groups via a snapshot template.</p> | |
19 */ | |
20 public class ReadAhead implements EntryConstraint { | |
21 private int theSize; | |
22 | |
23 public ReadAhead(int aSize) { | |
24 theSize = aSize; | |
25 } | |
26 | |
27 public int getSize() { | |
28 return theSize; | |
29 } | |
30 } |