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comparison src/org/dancres/blitz/entry/SleeveState.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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-1:000000000000 0:3dc0c5604566
1 package org.dancres.blitz.entry;
2
3 /**
4 Each Sleeve held in-cache has a chunk of management state associated with it
5 which is maintained in an instance of this class
6 */
7 class SleeveState {
8 /**
9 If set, indicates this Sleeve does not exist on disk.
10 i.e. If it needs to be written to disk it should be inserted rather
11 than updated (create as opposed to update).
12 */
13 static final int NOT_ON_DISK = 1;
14
15 /**
16 Indicates this Sleeve has been deleted and the space can be reclaimed.
17 */
18 static final int DELETED = 2;
19
20 /**
21 If set, indicates that this Sleeve should not be saved to disk
22
23 @see org.dancres.blitz.entry.WriteScheduler
24 */
25 static final int PINNED = 4;
26
27 private int theFlags;
28
29 /**
30 Applies the specified state cummulatively to the current state flags.
31 i.e. Logical OR
32 */
33 synchronized void set(int aFlags) {
34 theFlags |= aFlags;
35 }
36
37 /**
38 Replace existing state with that passed in.
39 */
40 synchronized void setExplicit(int aFlags) {
41 theFlags = aFlags;
42 }
43
44 synchronized boolean test(int aFlag) {
45 return ((theFlags & aFlag) != 0);
46 }
47
48 synchronized void clear(int aFlag) {
49 int myMask = aFlag ^ 0xFFFFFFFF;
50 theFlags &= myMask;
51 }
52
53 synchronized int get() {
54 return theFlags;
55 }
56
57 public synchronized String toString() {
58 return Integer.toBinaryString(theFlags);
59 }
60 }