Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/oid/AllocatorFactory.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.oid;
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2
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3 import java.io.File;
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4 import java.io.IOException;
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5
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6 import java.util.Map;
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7 import java.util.HashMap;
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8
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9 import net.jini.config.ConfigurationException;
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10
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11 import org.dancres.blitz.disk.DiskTxn;
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12
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13 import org.dancres.blitz.config.ConfigurationFactory;
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14
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15 import org.dancres.blitz.meta.RegistryFactory;
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16 import org.dancres.blitz.meta.Registry;
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17
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18 public class AllocatorFactory {
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19
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20 private static int DEFAULT_MAX_ALLOCATORS;
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21
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22 static {
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23 try {
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24 DEFAULT_MAX_ALLOCATORS =
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25 ((Integer)
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26 ConfigurationFactory.getEntry("maxOidAllocators",
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27 int.class,
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28 new Integer(4))).intValue();
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29 } catch (ConfigurationException aCE) {
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30 }
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31 }
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32
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33 private static Map theAllocators = new HashMap();
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34
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35 public static Allocator get(String aName, boolean isFifo)
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36 throws IOException {
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37 return get(aName, DEFAULT_MAX_ALLOCATORS, isFifo);
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38 }
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39
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40 public static Allocator get(String aName, int anAllocSpaceSize,
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41 boolean isFifo)
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42 throws IOException {
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43 return getImpl(aName, anAllocSpaceSize, isFifo);
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44 }
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45
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46 static Allocator getImpl(String aName, int anAllocSpaceSize,
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47 boolean isFifo)
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48 throws IOException {
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49
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50 synchronized(theAllocators) {
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51 Allocator myData = (Allocator) theAllocators.get(aName);
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52
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53 if (myData == null) {
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54 myData = newAllocator(aName, anAllocSpaceSize, isFifo);
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55 theAllocators.put(aName, myData);
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56 }
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57
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58 return myData;
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59 }
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60 }
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61
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62 public static void delete(String aName) throws IOException {
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63 synchronized(theAllocators) {
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64 AllocatorAdmin myData =
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65 (AllocatorAdmin) theAllocators.remove(aName);
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66
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67 if (myData != null)
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68 myData.delete();
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69 }
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70 }
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71
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72 private static Allocator newAllocator(String aName,
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73 int anAllocSpaceSize,
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74 boolean isFifo)
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75 throws IOException {
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76
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77 if (isFifo)
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78 return new FIFOAllocatorImpl(aName);
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79 else
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80 return new AllocatorImpl(aName, anAllocSpaceSize);
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81 }
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82 }