Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/entry/SleeveState.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 package org.dancres.blitz.entry; |
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2 |
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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 |
3dc0c5604566
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Dan Creswell <dan.creswell@gmail.com>
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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 |
3dc0c5604566
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20 /** |
3dc0c5604566
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21 If set, indicates that this Sleeve should not be saved to disk |
3dc0c5604566
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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) { |
3dc0c5604566
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41 theFlags = aFlags; |
3dc0c5604566
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Dan Creswell <dan.creswell@gmail.com>
parents:
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42 } |
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Dan Creswell <dan.creswell@gmail.com>
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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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Dan Creswell <dan.creswell@gmail.com>
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48 synchronized void clear(int aFlag) { |
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49 int myMask = aFlag ^ 0xFFFFFFFF; |
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parents:
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50 theFlags &= myMask; |
3dc0c5604566
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Dan Creswell <dan.creswell@gmail.com>
parents:
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51 } |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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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 } |