Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/config/EntryConstraints.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 package org.dancres.blitz.config;
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2
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3 import java.util.HashMap;
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4
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5 import java.util.logging.Level;
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6
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7 import net.jini.config.ConfigurationException;
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8
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9 import org.dancres.blitz.config.*;
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10
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11 /**
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12 * @todo Move this into the config package and add a factory to track all
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13 * of them. Also define a MINIMAL_CONSTRAINTS static which is an instance of
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14 * this class created via the null constructor.
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15 */
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16 public class EntryConstraints {
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17
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18 public static final EntryConstraints MINIMUM =
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19 new EntryConstraints();
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20
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21 private static int DEFAULT_CACHE_SIZE;
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22 private static int DEFAULT_READ_AHEAD;
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23
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24 static {
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25 try {
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26 DEFAULT_CACHE_SIZE =
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27 ((Integer)
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28 ConfigurationFactory.getEntry("entryReposCacheSize",
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29 int.class,
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30 new Integer(200))).intValue();
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31
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32 ConfigurationFactory.theLogger.log(Level.INFO,
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33 "Cache size: " + DEFAULT_CACHE_SIZE);
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34
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35 DEFAULT_READ_AHEAD =
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36 ((Integer)
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37 ConfigurationFactory.getEntry("entryReposReadahead",
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38 int.class,
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39 new Integer(0))).intValue();
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40
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41 ConfigurationFactory.theLogger.log(Level.INFO,
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42 "Read ahead: " + DEFAULT_READ_AHEAD);
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43 } catch (ConfigurationException aCE) {
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44 }
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45 }
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46
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47 private static HashMap theAllConstraints = new HashMap();
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48
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49 private HashMap theConstraints = new HashMap();
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50 private String theType;
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51
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52 public static EntryConstraints getConstraints(String aType)
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53 throws ConfigurationException {
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54 synchronized(theAllConstraints) {
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55 EntryConstraints myConstraints =
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56 (EntryConstraints) theAllConstraints.get(aType);
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57
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58 if (myConstraints == null) {
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59 myConstraints = new EntryConstraints(aType);
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60
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61 theAllConstraints.put(aType, myConstraints);
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62 }
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63
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64 return myConstraints;
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65 }
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66 }
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67
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68 /**
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69 Create an instance of EntryConstraints with no settings loaded from
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70 config and a minimal set of useful constraints.
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71 */
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72 private EntryConstraints() {
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73 theConstraints.put(CacheSize.class, new CacheSize(1));
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74 }
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75
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76 private EntryConstraints(String aType) throws ConfigurationException {
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77 theType = aType;
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78
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79 init();
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80 }
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81
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82 private void init() throws ConfigurationException {
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83 String myConfigName = theType.replaceAll("\\.", "_");
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84 myConfigName = myConfigName.replaceAll("\\$", "_");
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85
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86 EntryConstraint[] myConstraints = (EntryConstraint[])
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87 ConfigurationFactory.getEntry(myConfigName,
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88 EntryConstraint[].class,
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89 new EntryConstraint[0]);
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90
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91 for (int i = 0; i < myConstraints.length; i++) {
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92 theConstraints.put(myConstraints[i].getClass(), myConstraints[i]);
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93 }
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94
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95 if (theConstraints.get(CacheSize.class) == null) {
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96 theConstraints.put(CacheSize.class,
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97 new CacheSize(DEFAULT_CACHE_SIZE));
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98 }
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99
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100 // If FIFO is enabled, force read ahead to zero
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101 //
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102 if (theConstraints.get(Fifo.class) != null) {
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103 theConstraints.put(ReadAhead.class, new ReadAhead(0));
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104 } else {
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105 if (theConstraints.get(ReadAhead.class) == null) {
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106 theConstraints.put(ReadAhead.class,
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107 new ReadAhead(DEFAULT_READ_AHEAD));
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108 }
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109 }
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110 }
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111
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112 public EntryConstraint get(Class aConstraint) {
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113 EntryConstraint myResult =
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114 (EntryConstraint) theConstraints.get(aConstraint);
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115
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116 return myResult;
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117 }
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118 }