| Methods Summary |
|---|
| void | cleanup(TalkServerThread tst)
if (tst != null) {
try {
if (tst.os != null) {
tst.os.close();
tst.os = null;
}
} catch (Exception e) {} //Ignore errors
try {
if (tst.is != null) {
tst.is.close();
tst.is = null;
}
} catch (Exception e) {} //Ignore errors
try {
if (tst.socket != null) {
tst.socket.close();
tst.socket = null;
}
} catch (Exception e) {} //Ignore errors
}
|
| protected TalkServerThread | connectToClient(java.net.ServerSocket serverRSocket)
Socket rendezvousSocket = null;
TalkServerThread tst = null;
//Listen for client connection on the rendezvous socket.
try {
rendezvousSocket = serverRSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed.");
e.printStackTrace();
return null;
}
//Create a thread to handle this connection.
try {
tst = new TalkServerThread(rendezvousSocket, this);
tst.start();
} catch (Exception e) {
System.err.println("Couldn't create TalkServerThread:");
e.printStackTrace();
return null;
}
writeToStream("Successful connection. "
+ "Please wait for second applet to connect...",
tst.os);
return tst;
|
| boolean | everythingIsOK(int tstNum)
TalkServerThread tst = tstList[tstNum];
if (tst == null) {
if (DEBUG) {
System.out.println("TalkServerThread #" + tstNum
+ " is null");
}
return false;
} else {
if (tst.os == null) {
if (DEBUG) {
System.out.println("TalkServerThread #" + tstNum
+ " output stream is null.");
}
return false;
}
if (tst.is == null) {
if (DEBUG) {
System.out.println("TalkServerThread #" + tstNum
+ " input stream is null.");
}
return false;
}
if (tst.socket == null) {
if (DEBUG) {
System.out.println("TalkServerThread #" + tstNum
+ " socket is null.");
}
return false;
}
}
return true;
|
| public void | forwardString(java.lang.String string, TalkServerThread requestor)
BufferedWriter clientStream = null;
if (tstList[0] == requestor) {
if (tstList[1] != null) {
clientStream = tstList[1].os;
} else {
if (DEBUG) {
System.out.println("Applet #0 has a string to forward, "
+ "but Applet #1 is gone...");
}
return;
}
} else {
if (tstList[0] != null) {
clientStream = tstList[0].os;
} else {
if (DEBUG) {
System.out.println("Applet #1 has a string to forward, "
+ "but Applet #0 is gone...");
}
return;
}
}
if (clientStream != null) {
writeToStream(string, clientStream);
} else if (DEBUG) {
System.out.println("Can't forward string -- no output stream.");
}
|
| public static void | main(java.lang.String[] args)
new TalkServer().start();
|
| public void | start()
ServerSocket serverRSocket = null;
int numConnected = 0;
try {
serverRSocket = new ServerSocket(0);
System.out.println("TalkServer listening on rendezvous port: "
+ serverRSocket.getLocalPort());
} catch (IOException e) {
System.err.println("Server could not create server socket for rendezvous.");
return;
}
while (true) {
//Connect to two clients.
while (numConnected < 2) {
TalkServerThread tst;
tst = connectToClient(serverRSocket);
if (tst != null) {
numConnected++;
if (tstList[0] == null) {
tstList[0] = tst;
} else {
tstList[1] = tst;
}
}
} //end while (numConnected < 2) loop
if (DEBUG) {
try {
System.out.println("tst #0 = " + tstList[0]);
} catch (Exception e) {}
try {
System.out.println("tst #1 = " + tstList[1]);
} catch (Exception e) {}
}
//If they're really OK, tell them to start writing.
if (everythingIsOK(0) & everythingIsOK(1)) {
for (int i = 0; i < 2; i++) {
writeToStream("START WRITING!\n----------------------"
+ "-------------", tstList[i].os);
}
} else {
System.err.println("2 server threads created, but "
+ "not everything is OK");
}
while (numConnected == 2) {
if (!everythingIsOK(0)) {
if (DEBUG) {
System.out.println("Applet #0 is hosed; disconnecting.");
}
numConnected--;
cleanup(tstList[0]);
tstList[0] = null;
}
if (!everythingIsOK(1)) {
if (DEBUG) {
System.out.println("Applet #1 is hosed; disconnecting.");
}
numConnected--;
cleanup(tstList[1]);
tstList[1] = null;
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
} //end while(numConnected==2) loop
if (DEBUG) {
try {
System.out.println("Number of connections = " + numConnected);
System.out.println("tst #0 = " + tstList[0]);
System.out.println("tst #1 = " + tstList[1]);
} catch (Exception e) {}
}
} //end while (true) loop
|
| public void | writeToStream(java.lang.String string, java.io.BufferedWriter stream)
if (DEBUG) {
System.out.println("TalkServer about to forward data: "
+ string);
}
try {
stream.write(string);
stream.newLine();
stream.flush();
if (DEBUG) {
System.out.println("TalkServer forwarded string.");
}
} catch (IOException e) {
System.err.println("TalkServer failed to forward string:");
e.printStackTrace();
return;
} catch (NullPointerException e) {
System.err.println("TalkServer can't forward string "
+ "since output stream is null.");
return;
}
|
