// initialize data hash table servers
// read server addresses from file and initialize the servers
private void initServers() {
try {
java.net.URL path = ClassLoader.getSystemResource(clientSettingFile);
FileReader fr = new FileReader(path.getFile());
BufferedReader br = new BufferedReader(fr);
try {
String[] portMap = br.readLine().split(",");
mServerCount = portMap.length;
mPortMap = new int[mServerCount];
for (int i = 0; i < mServerCount; i++) {
mPortMap[i] = Integer.parseInt(portMap[i]);
}
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
} catch (FileNotFoundException e2) {
e2.printStackTrace();
System.exit(-1);
}
mDhtServerArray = new IDistributedHashTable[mServerCount];
for (int i = 0; i < mServerCount; i++) {
try {
mDhtServerArray[i] =
(IDistributedHashTable)
Naming.lookup("rmi://localhost:" + mPortMap[i] + "/DistributedHashTable");
appendOutput("server: " + (i + 1) + " is connected");
} catch (Exception e) {
appendOutput("initServers: " + (i + 1) + " " + e.getMessage());
}
}
}
// send a count request to a server
// 1 < key < max key number
// server: id of server to count the number of entities
private void sendCountRequest(int server) {
try {
if (mDhtServerArray[server - 1] != null) {
int n = mDhtServerArray[server - 1].count();
appendOutput("Count machine " + server + " is " + n);
} else appendOutput("sendCountRequest: server " + server + " is not initialized");
} catch (Exception e) {
appendOutput("sendCountRequest: " + server + e.getMessage());
}
}
// send a purge request to a server
// 1 < key < max key number
// server: id of server to purge data
private void sendPurgeRequest() {
for (int i = 0; i < mServerCount; i++) {
if (mDhtServerArray[i] != null) {
try {
mDhtServerArray[i].purge();
appendOutput("purge: machine " + (i + 1));
} catch (Exception e1) {
appendOutput("purge server " + (i + 1) + " " + e1.getMessage());
}
} else appendOutput("purge server " + (i + 1) + " is not initialized");
}
}
// send a delete request to a server
// 1 < key < max key number
// server: id of server to delete the key
private void sendDeleteRequest(int key, int server) {
IQueryRequest queryReq = new QueryRequest(mRequestId++, server, key);
try {
if (mDhtServerArray[server - 1] != null) {
UnicastRemoteObject.exportObject(queryReq);
mDhtServerArray[server - 1].delete(queryReq);
appendOutput("DHT Server:\n" + queryReq.getMessage());
} else appendOutput("sendDeleteRequest: server " + server + " is not initialized");
} catch (Exception e) {
appendOutput("sendDeleteRequest: " + server + e.getMessage());
}
}
// send an insert request to a server
// 1 < key < max key number
// server: id of server to insert the key
private void sendInsertRequest(int key, Object value, int server) {
IInsertRequest insReq = new InsertRequest(mRequestId++, server, key, value);
try {
if (mDhtServerArray[server - 1] != null) {
UnicastRemoteObject.exportObject(insReq);
mDhtServerArray[server - 1].insert(insReq);
appendOutput("DHT Server:\n" + insReq.getMessage());
} else appendOutput("sendInsertRequest: server " + server + " is not initialized");
} catch (Exception e) {
appendOutput("sendInsertRequest: " + server + e.getMessage());
}
}
// send a lookup request to a server
// 1 < key < max key number
// server: id of server to lookup the key
private void sendLookupRequest(int key, int server) {
IQueryRequest queryReq = new QueryRequest(mRequestId++, server, key);
try {
if (mDhtServerArray[server - 1] != null) {
UnicastRemoteObject.exportObject(queryReq);
String value = (String) mDhtServerArray[server - 1].lookup(queryReq);
appendOutput(
"DHT Server:\n" + queryReq.getMessage() + "\nDHT Client:\nlookup value is " + value);
} else appendOutput("sendLookupRequest: server " + server + " is not initialized");
} catch (Exception e) {
appendOutput("sendLookupRequest: " + server + e.getMessage());
}
}
public static void main(String[] args) {
String clientSettingFile = "";
GetOpt getopt = new GetOpt(args, "f:");
try {
int c;
while ((c = getopt.getNextOption()) != -1) {
switch (c) {
case 'f':
clientSettingFile = getopt.getOptionArg();
break;
}
}
} catch (Exception e1) {
e1.printStackTrace();
}
final DHTInteractiveClient dhtClient = new DHTInteractiveClient(clientSettingFile);
javax.swing.SwingUtilities.invokeLater(
new Runnable() {
public void run() {
dhtClient.createAndShowGUI();
}
});
}