public void actionPerformed(ObjectOutputStream oos, Message msg) throws EventHandleException {
Message result = null;
Head thead = new Head();
try {
/* get the handler of the ServerPeer */
ServerPeer serverpeer = (ServerPeer) gui.peer();
/* get the message body */
SPLeaveFindReplacementNodeBody body = (SPLeaveFindReplacementNodeBody) msg.getBody();
TreeNode treeNode = serverpeer.getTreeNode(body.getLogicalDestination());
if (treeNode == null) {
System.out.println("Tree node is null, do not process the message");
return;
}
RoutingTableInfo leftRoutingTable = treeNode.getLeftRoutingTable();
RoutingTableInfo rightRoutingTable = treeNode.getRightRoutingTable();
RoutingItemInfo temptInfo, transferInfo = null;
int i;
if (treeNode.getLeftChild() != null) {
// if it has left child
body.setPhysicalSender(serverpeer.getPhysicalInfo());
body.setLogicalSender(treeNode.getLogicalInfo());
body.setLogicalDestination(treeNode.getLeftChild().getLogicalInfo());
thead.setMsgType(MsgType.SP_LEAVE_FIND_REPLACEMENT_NODE.getValue());
result = new Message(thead, body);
serverpeer.sendMessage(treeNode.getLeftChild().getPhysicalInfo(), result);
} else if (treeNode.getRightChild() != null) {
// if it has right child
body.setPhysicalSender(serverpeer.getPhysicalInfo());
body.setLogicalSender(treeNode.getLogicalInfo());
body.setLogicalDestination(treeNode.getRightChild().getLogicalInfo());
thead.setMsgType(MsgType.SP_LEAVE_FIND_REPLACEMENT_NODE.getValue());
result = new Message(thead, body);
serverpeer.sendMessage(treeNode.getRightChild().getPhysicalInfo(), result);
} else {
// if it has no child, check routing table
i = 0;
while ((i < leftRoutingTable.getTableSize()) && (transferInfo == null)) {
temptInfo = leftRoutingTable.getRoutingTableNode(i);
if (temptInfo != null) {
if ((temptInfo.getLeftChild() != null) || (temptInfo.getRightChild() != null)) {
transferInfo = temptInfo;
}
}
i++;
}
i = 0;
while ((i < rightRoutingTable.getTableSize()) && (transferInfo == null)) {
temptInfo = rightRoutingTable.getRoutingTableNode(i);
if (temptInfo != null) {
if ((temptInfo.getLeftChild() != null) || (temptInfo.getRightChild() != null)) {
transferInfo = temptInfo;
}
}
i++;
}
if (transferInfo != null) {
body.setPhysicalSender(serverpeer.getPhysicalInfo());
body.setLogicalSender(treeNode.getLogicalInfo());
if (transferInfo.getLeftChild() != null) {
body.setLogicalDestination(transferInfo.getLeftChild().getLogicalInfo());
thead.setMsgType(MsgType.SP_LEAVE_FIND_REPLACEMENT_NODE.getValue());
result = new Message(thead, body);
serverpeer.sendMessage(transferInfo.getLeftChild().getPhysicalInfo(), result);
} else {
body.setLogicalDestination(transferInfo.getRightChild().getLogicalInfo());
thead.setMsgType(MsgType.SP_LEAVE_FIND_REPLACEMENT_NODE.getValue());
result = new Message(thead, body);
serverpeer.sendMessage(transferInfo.getRightChild().getPhysicalInfo(), result);
}
} else {
doLeaveAndReplace(serverpeer, treeNode, body);
}
}
} catch (Exception e) {
e.printStackTrace();
throw new EventHandleException(
"Super peer finds a replacement peer failure when it leaves network", e);
}
}
private void doLeaveAndReplace(
ServerPeer serverpeer, TreeNode treeNode, SPLeaveFindReplacementNodeBody body) {
Message result = null;
Head thead = new Head();
Body tbody = null, tbodyLeave = null;
try {
AdjacentNodeInfo adjacentInfo;
Vector<String> transferWorkList;
int i;
adjacentInfo =
new AdjacentNodeInfo(
treeNode.getParentNode().getPhysicalInfo(),
treeNode.getParentNode().getLogicalInfo());
transferWorkList =
SPGeneralAction.getTransferWorkList(
treeNode, treeNode.getParentNode().getLogicalInfo().toString());
/*
* send update adjacent request to its adjacent node,
* and leave request to its parent
*/
treeNode.getContent().setData(SPGeneralAction.loadData());
if ((treeNode.getLogicalInfo().getNumber() % 2) == 0) {
tbodyLeave =
new SPLeaveBody(
serverpeer.getPhysicalInfo(),
treeNode.getLogicalInfo(),
treeNode.getContent(),
treeNode.getRightAdjacentNode(),
true,
transferWorkList,
treeNode.getParentNode().getLogicalInfo());
if (treeNode.getRightAdjacentNode() != null) {
tbody =
new SPUpdateAdjacentLinkBody(
serverpeer.getPhysicalInfo(),
treeNode.getLogicalInfo(),
adjacentInfo,
false,
treeNode.getRightAdjacentNode().getLogicalInfo());
thead.setMsgType(MsgType.SP_UPDATE_ADJACENT_LINK.getValue());
result = new Message(thead, tbody);
serverpeer.sendMessage(treeNode.getRightAdjacentNode().getPhysicalInfo(), result);
}
} else {
tbodyLeave =
new SPLeaveBody(
serverpeer.getPhysicalInfo(),
treeNode.getLogicalInfo(),
treeNode.getContent(),
treeNode.getLeftAdjacentNode(),
false,
transferWorkList,
treeNode.getParentNode().getLogicalInfo());
if (treeNode.getLeftAdjacentNode() != null) {
tbody =
new SPUpdateAdjacentLinkBody(
serverpeer.getPhysicalInfo(),
treeNode.getLogicalInfo(),
adjacentInfo,
true,
treeNode.getLeftAdjacentNode().getLogicalInfo());
thead.setMsgType(MsgType.SP_UPDATE_ADJACENT_LINK.getValue());
result = new Message(thead, tbody);
serverpeer.sendMessage(treeNode.getLeftAdjacentNode().getPhysicalInfo(), result);
}
}
thead.setMsgType(MsgType.SP_LEAVE.getValue());
result = new Message(thead, tbodyLeave);
serverpeer.sendMessage(treeNode.getParentNode().getPhysicalInfo(), result);
/*
* notify its neighbor nodes
*/
RoutingTableInfo leftRoutingTable = treeNode.getLeftRoutingTable();
RoutingItemInfo temptInfo;
for (i = 0; i < leftRoutingTable.getTableSize(); i++) {
temptInfo = leftRoutingTable.getRoutingTableNode(i);
if (temptInfo != null) {
tbody =
new SPUpdateRoutingTableDirectlyBody(
serverpeer.getPhysicalInfo(),
treeNode.getLogicalInfo(),
null,
i,
true,
temptInfo.getLogicalInfo());
thead.setMsgType(MsgType.SP_UPDATE_ROUTING_TABLE_DIRECTLY.getValue());
result = new Message(thead, tbody);
serverpeer.sendMessage(temptInfo.getPhysicalInfo(), result);
}
}
RoutingTableInfo rightRoutingTable = treeNode.getRightRoutingTable();
for (i = 0; i < rightRoutingTable.getTableSize(); i++) {
temptInfo = rightRoutingTable.getRoutingTableNode(i);
if (temptInfo != null) {
tbody =
new SPUpdateRoutingTableDirectlyBody(
serverpeer.getPhysicalInfo(),
treeNode.getLogicalInfo(),
null,
i,
false,
temptInfo.getLogicalInfo());
thead.setMsgType(MsgType.SP_UPDATE_ROUTING_TABLE_DIRECTLY.getValue());
result = new Message(thead, tbody);
serverpeer.sendMessage(temptInfo.getPhysicalInfo(), result);
}
}
/*
* ready to replace
*/
tbody =
new SPLeaveFindReplacementNodeReplyBody(
serverpeer.getPhysicalInfo(), body.getLogicalRequester());
thead.setMsgType(MsgType.SP_LEAVE_FIND_REPLACEMENT_NODE_REPLY.getValue());
result = new Message(thead, tbody);
serverpeer.sendMessage(body.getPhysicalRequester(), result);
// 4. delete logical node
SPGeneralAction.deleteTreeNode(serverpeer, treeNode);
} catch (Exception e) {
e.printStackTrace();
}
}