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import java.net.*;
import java.io.*;
/*
* Start one thread for receiving a packet, wait for it to set up,
* send a packet to it, and wait until it completes. Compare the
* packet to make sure it came thru without errors.
*/
public class SocketSendReceiveTest
implements Runnable
{
public static final int port = 4000 + (int)(java.lang.Math.random() * 2000);
public static final String message = "hello";
public static int count = 0;
public static String received;
void send()
throws Exception
{
InetAddress local = InetAddress.getLocalHost();
Socket sender = new Socket(local, port);
byte []message_bytes = message.getBytes();
DataOutputStream out = new DataOutputStream(sender.getOutputStream());
out.write(message_bytes, 0, message_bytes.length);
out.flush();
sender.close();
}
void receive()
throws Exception
{
ServerSocket socket = new ServerSocket(port);
synchronized(this) {
notifyAll();
}
Socket connection = socket.accept();
DataInputStream in = new DataInputStream(connection.getInputStream());
byte[] buffer = new byte[100];
int length = in.read(buffer);
connection.close();
socket.close();
received = new String(buffer, 0, length);
count++;
if ( message.length() != received.length() )
throw new Exception("Receved "+ received.length()+
" bytes but sent "+message.length() + " bytes");
if ( ! message.equals(received) )
throw new Exception("Receved \""+ received+
"\" but sent \""+message + "\"");
}
public void run()
{
String name = Thread.currentThread().getName();
if (name.equals("timer")) {
try {
Thread.sleep(10000);
} catch (InterruptedException e){}
System.out.println("FAILED: timer triggered");
System.exit(0);
}
try {
receive();
} catch (Exception e) {
System.out.println("FAILED: receiver (port "+port + "): " + e);
System.exit(0);
}
}
public static void main(String args[])
{
try {
SocketSendReceiveTest sender = new SocketSendReceiveTest();
SocketSendReceiveTest receiver = new SocketSendReceiveTest();
Thread receiver_thread = new Thread(receiver);
/* Make sure the test terminates even if it hangs on network */
SocketSendReceiveTest timer = new SocketSendReceiveTest();
Thread timer_thread = new Thread(timer, "timer");
timer_thread.start();
synchronized(receiver) {
receiver_thread.start();
receiver.wait();
}
try {
sender.send();
} catch (Exception e) {
System.out.println("FAILED: receiver (port "+port + "): " + e);
System.exit(0);
}
receiver_thread.join();
if (0 == count)
throw new Exception("Nothing received");
System.out.println("PASSED: Socket send/receive count="+count+
" message="+received);
System.exit(0);
} catch (Exception e) {
System.out.println("FAILED: " + e);
System.exit(0);
}
}
}
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