Mercurial > hg > blitz_stable

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