Mercurial > hg > Members > nobuyasu > jungle-network

annotate src/main/java/app/bbs/BulletinBoardJungleManager.java @ 146:29734d7d6521

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Added ShowMessageWithTimeStampServlet
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 28 Jan 2014 08:47:45 +0900
parents c1d75b031b15
children 202ea963ec20
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1 package app.bbs;
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3 import java.nio.ByteBuffer;
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4 import java.util.Date;
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6 import javax.naming.directory.Attribute;
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8 import alice.jungle.operations.NetworkTreeOperationLog;
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9 import alice.jungle.transaction.JungleUpdater;
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10 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.DefaultJungle;
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11 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.Jungle;
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12 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.JungleTree;
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13 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.JungleTreeEditor;
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14 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.core.Attributes;
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15 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.core.Children;
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16 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.core.Node;
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17 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.DefaultNodePath;
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18 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.DefaultTreeEditor;
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19 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.traverser.DefaultTraverser;
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20 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Either;
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21 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Error;
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23 public class BulletinBoardJungleManager {
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24 private static BulletinBoardJungleManager instance = new BulletinBoardJungleManager();
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25 private Jungle jungle;
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27 private BulletinBoardJungleManager() {
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28 jungle = new DefaultJungle(null,"default",new DefaultTreeEditor(new DefaultTraverser()));
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29 }
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31 public static BulletinBoardJungleManager getInstantce() {
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32 return instance;
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33 }
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34
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35 public static void setJungle(Jungle _j) {
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36 instance.jungle = _j;
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37 }
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39 public static Jungle getJungle() {
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40 return instance.jungle;
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41 }
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42
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43 public static JungleTree createNewTree(String name) {
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44 return instance.jungle.createNewTree(name);
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45 }
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47 public static Either<Error, JungleTreeEditor> update(NetworkTreeOperationLog netLog) {
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48 String treeName = netLog.getTreeName();
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49 Jungle jungle = BulletinBoardJungleManager.getJungle();
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50 if (jungle.getTreeByName(treeName) == null) {
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51 if(null == jungle.createNewTree(treeName)){
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52 throw new IllegalStateException();
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53 }
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54 }
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57 Either<Error, JungleTreeEditor> either = null;
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58 JungleTree tree = jungle.getTreeByName(treeName);
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60 do {
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61 JungleTreeEditor editor = tree.getLocalTreeEditor();
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62 /*
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63 * Merge.
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64 */
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65 int pos = calculatePosition(tree.getRootNode(), netLog.getTimeStamp());
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66 either = JungleUpdater.edit(editor, netLog, pos);
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67 if(either.isA()) {
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68 throw new IllegalStateException();
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69 }
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71 editor = either.b();
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72 either = editor.success();
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73 }while(either.isA());
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75 renewBoardTimeStamp(tree);
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76 return either;
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77 }
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78
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79 private static void renewBoardTimeStamp(JungleTree tree) {
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80 JungleTreeEditor editor = tree.getLocalTreeEditor();
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81 DefaultNodePath root = new DefaultNodePath();
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82 long timestamp = new Date().getTime();
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83 ByteBuffer tBuffer = ByteBuffer.allocate(16);
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84 tBuffer.putLong(timestamp);
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85
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86 Either<Error, JungleTreeEditor> either = null;
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87 do {
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88 either = editor.putAttribute(root, "renewtime", tBuffer);
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89 editor = either.b();
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90 either = editor.success();
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91 }while(either.isA());
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93 }
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95 private static int calculatePosition(Node node, long newNodeTimeStamp) {
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96 int count = 0;
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97 long childTimeStamp = 0;
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98 for(Node n : node.getChildren()) {
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99 ByteBuffer timestamp = n.getAttributes().get("timestamp");
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100 if(timestamp == null) {
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101 return count;
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102 }
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103 childTimeStamp = timestamp.getLong(0);
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104 if (newNodeTimeStamp < childTimeStamp) {
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105 break;
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106 }
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107 count++;
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108 }
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109 return count;
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110 }
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111 }