Mercurial > hg > Members > riono > TreeVNC_ja_comment

annotate src/main/java/jp/ac/u_ryukyu/treevnc/TreeManagement.java @ 464:a817fa255673

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fix onTheSame Network
author kono
date Tue, 12 Jul 2016 18:52:27 +0900
parents 5bef0f09f088
children f7210f834403
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diff changeset
1 package jp.ac.u_ryukyu.treevnc;
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2
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3
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4 import java.io.IOException;
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5 import java.net.InetAddress;
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6 import java.net.UnknownHostException;
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7 import java.util.LinkedList;
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8
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9 public class TreeManagement {
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10
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11
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12 private final int treeId;
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13 public LinkedList<TreeVNCNode> nodeList = new LinkedList<TreeVNCNode>();
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14 public LinkedList<NetworkAddress> treeAddresses = new LinkedList<NetworkAddress>();
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15 private final int treebranch = 2;
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16 private boolean showTreeNode = false;
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17 // node id
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18 // ttttnnnnnnnnnnnn
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19 // tttt 4bit tree number
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20 // nnnnnnnnnnnn 12bit node number
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21 public final int MAX_TREE = 15;
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22 public final int MAX_TREE_NODE = (1<<12)-1;
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23
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24 public TreeManagement(String hostName, int vncport, boolean showTree, int id) {
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25 treeId = id;
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26 TreeVNCNode me = new TreeVNCNode(hostName, vncport,"localhost");
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27 showTreeNode = showTree;
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28 me.setTreeNum(0);
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29 nodeList.add(me);
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30 }
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31
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32 private class NetworkAddress {
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33 InetAddress inetaddress;
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34 byte [] address;
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35 byte [] netmask;
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36
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37 public NetworkAddress(InetAddress ipaddress, byte[] netaddress, byte[] netmask) {
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38 inetaddress = ipaddress;
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39 address = netaddress;
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40 this.netmask = netmask;
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41 }
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42 }
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43
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44 public int getTreeId() {
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45 return treeId;
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46 }
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47
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48 /**
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49 * a parent is lost, remove from the list and move last one into here
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50 * @param nodeNum
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51 * parent value
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52 */
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53 public void moveLastNodeToLostNodePosition(int nodeNum) {
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54 nodeList.remove(nodeNum);
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55 if (nodeNum != nodeList.size()) {
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56 TreeVNCNode node = nodeList.removeLast();
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57 node.setTreeNum(nodeNum);
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58 nodeList.add(nodeNum, node);
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59 }
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60 }
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61
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62 private void checkParameter(int parent, int counter, int leaderflag2) {
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63 System.out.print("number p =" + parent);
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64 System.out.print(" number i =" + counter);
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65 System.out.println(" leaderflag=" + leaderflag2 + "\n");
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66 }
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67
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68 private TreeVNCNode getParentNode(int nodeNum) {
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69 int parentnum = (nodeNum - 1) / treebranch;
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70 return nodeList.get(parentnum);
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71 }
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72
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73
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74 public TreeVNCNode getChildNode(TreeVNCNode newparent, int i) {
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75 int child = newparent.getTreeNum() * treebranch + i + 1;
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76 if (child >= nodeList.size()) {
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77 return(null);
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78 } else {
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79 return(nodeList.get(child));
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80 }
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81 }
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82
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83 /**
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84 * A parent is lost, move last node which has no child to the position
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85 * @param hostname
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86 * @param port
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87 * @param myHostName
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88 */
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89 public void fixLostParent(String hostname, int port, String myHostName) {
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90 TreeVNCNode lostParentNode = lookup(nodeList,hostname,port);
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91 if (lostParentNode == null ) return; // something wrong
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92 int treeNumber = lostParentNode.getTreeNum();
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93 TreeVNCNode deadParent = getParentNode(treeNumber);
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94 TreeVNCNode me = nodeList.getFirst();
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95 me.setHostName(myHostName);
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96 if (deadParent.getTreeNum() == 0) {
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97 // if dead root, connect me.
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98 try {
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99 connectTo(me, lostParentNode);
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100 } catch (IOException e) {
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101 e.printStackTrace();
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102 }
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103 return;
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104 }
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105 if (getChildNode(deadParent, 0) == null) return;
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106 moveLastNodeToLostNodePosition(deadParent.getTreeNum());
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107 lostNodeConnection(deadParent);
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108 // if lostParentNode is the last one, we don't need reconnection
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109 // Thread.sleep(intv_time);
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110 }
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111
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112 public void fixLostChild(String hostname, int port, String myHostName, int clientId) {
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113 TreeVNCNode lostChildNode = lookup(nodeList, hostname, port);
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114 if (lostChildNode == null) return;
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115 int lostChildNodeNum;
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116 // if isTreeManager
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117 if (lostChildNode.getTreeNum() == 0) {
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118 lostChildNodeNum = clientId + 1;
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119 } else {
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120 lostChildNodeNum = (lostChildNode.getTreeNum() * treebranch) + clientId + 1;
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121 }
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122 TreeVNCNode deadChild;
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123 fixLostChild1(lostChildNodeNum);
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124 }
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125
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126 public void fixLostChild1(int nodeNum) {
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127 TreeVNCNode deadNode;
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128 try {
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129 deadNode = nodeList.get(nodeNum);
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130 } catch (IndexOutOfBoundsException e) {
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131 // this node became new node instead of deathChild.
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132 deadNode = null;
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133 }
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134 if (deadNode != null) {
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135 moveLastNodeToLostNodePosition(deadNode.getTreeNum());
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136 lostNodeConnection(deadNode);
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137 }
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138 if (showTreeNode) {
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139 showTreeNode();
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140 }
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141 }
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142
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143 /**
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144 * send reconnect to all children
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145 * @param deadNode
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146 */
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147 public void lostNodeConnection(TreeVNCNode deadNode) {
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148 if (nodeList.size() < deadNode.getTreeNum()+1) {
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149 return;
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150 }
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151 TreeVNCNode newNode = nodeList.get(deadNode.getTreeNum());
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152 TreeVNCNode parentNode = getParentNode(newNode.getTreeNum());
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153 // new node connect to parent node.
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154 try {
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155 connectTo(parentNode, newNode);
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156 } catch (IOException e) {
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157 e.printStackTrace();
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158 }
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159 // if children node exist, children connect to new node.
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160 for(int i=0; i < treebranch; i++) {
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161 TreeVNCNode child = getChildNode(newNode, i);
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162 if (child != null) {
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163 try {
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164 connectTo(newNode, child);
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165 } catch (IOException e) {
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166 e.printStackTrace();
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167 }
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168 }
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169 }
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170 }
173
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171
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172 public void connectTo(TreeVNCNode newparent, TreeVNCNode n) throws IOException {
223
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173 TreeVncProtocol vc1 = new TreeVncProtocol(n.getHostname(),n.getPort());
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174 short nodeId = (short) ( n.getTreeNum() + ( treeId << 12 ));
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175 vc1.connectTo(newparent.getHostname(), newparent.getPort(), isLeader(n), nodeId);
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176 }
173
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177
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178 private int isLeader(TreeVNCNode n) {
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179 return ( n.getTreeNum() % treebranch == 1) ? 1 : 0;
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180 }
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181
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182 private TreeVNCNode lookup(LinkedList<TreeVNCNode> list, String hostname, int port) {
223
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183 for (TreeVNCNode r : list) {
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184 if (r.getHostname().equals(hostname) && r.getPort() == port )
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185 return r;
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186 }
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187 return null;
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188 }
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189
223
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190 /**
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191 * Determine tree topology and send CONNECT_TO command
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192 * @param hostname
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193 * @param port
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194 */
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195 public void decideWhereToConnect(String hostname, int port, String localhostname) {
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196 TreeVNCNode node = new TreeVNCNode(hostname, port, localhostname);
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197 node.setTreeNum(nodeList.size());
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198
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199 InetAddress ipAddress = null;
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200 try {
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201 ipAddress = InetAddress.getByName(hostname);
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202 } catch (UnknownHostException e) {
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203 System.out.println("root : whereToConnect : cannot get ipAddress" + hostname);
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204 return;
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205 }
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206 if (onTheSameNetwork(ipAddress))
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207 nodeList.add(node);
223
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208 if (nodeList.size() >= treebranch + 1) {
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209 TreeVNCNode parent = getParentNode(node.getTreeNum());
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210 checkParameter(parent.getTreeNum(), nodeList.size(), isLeader(node));
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211 try {
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212 connectTo(parent, node);
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213 } catch (IOException e) {
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214 nodeList.remove(node);
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215 System.out.println("root : whereToConnect : Connection Faild" + hostname);
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216 return;
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217 }
223
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218 } else {
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219 // connect to me
223
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220 TreeVNCNode me = nodeList.getFirst();
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221 me.setHostName(localhostname);
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222 try {
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223 connectTo(me, node);
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224 } catch (IOException e) {
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225 nodeList.remove(node);
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226 System.out.println("root : whereToConnect : Connection Faild" + hostname);
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227 return;
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228 }
223
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229 }
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230 if (showTreeNode) {
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231 showTreeNode();
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232 }
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233 }
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234
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235 /**
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236 * show Tree Node.
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237 */
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238 public void showTreeNode() {
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239 int nl = 0, pow = 2;
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240 for (int i=0; i<nodeList.size(); i++) {
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241 TreeVNCNode treeNode = nodeList.get(i);
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242 System.out.print(treeNode.getTreeNum() + ":" + treeNode.getPort() + ":" + treeNode.getHostname());
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243 if (i==nl) {
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244 System.out.println();
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245 nl = nl + pow;
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246 pow = pow * pow;
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247 } else {
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248 System.out.print(" ");
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249 }
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250
163
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251 }
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252 System.out.println();
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253 }
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254
223
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255 public LinkedList<TreeVNCNode> getList() {
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256 return nodeList;
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257 }
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258
223
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259 public void setList(LinkedList<TreeVNCNode> _ls) {
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260 nodeList = _ls;
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261 }
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262
223
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263 public int getTreeBranch() {
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264 return treebranch;
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265 }
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266
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267 public void setNetMask(byte[] netmask, byte[] netaddress, InetAddress ipaddress) {
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268 treeAddresses.add(new NetworkAddress(ipaddress,netaddress,netmask) );
223
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269 }
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270
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271 public boolean onTheSameNetwork(InetAddress adr) {
223
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272 byte [] byteadr = adr.getAddress();
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273 for (NetworkAddress n : treeAddresses) {
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274 byte [] netmask = n.netmask;
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275 byte [] netaddress = n.address;
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276 if (byteadr.length != netmask.length) continue;
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277 int i;
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278 for (i = 0; i < netmask.length; i++) {
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279 if ((netmask[i] & byteadr[i]) != netaddress[i]) break;
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280 }
464
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281 if (i < netmask.length) continue;
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282 return true;
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283 }
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284 return false;
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285 }
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286 }