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package derms.replica.replica1;
import java.io.IOException;
import java.io.Serializable;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.List;
public class ResourceTransfer {
public static final int bufsize = 1024;
public static void send(Resource[] resources, SocketAddress remoteAddr) throws IOException {
DatagramSocket sock = new DatagramSocket();
for (Resource resource : resources) {
DatagramPacket pkt = ObjectPacket.create(resource, remoteAddr);
sock.send(pkt);
}
DatagramPacket pkt = ObjectPacket.create(new EndOfTransmission(), remoteAddr);
sock.send(pkt);
sock.close();
}
public static Resource[] receive(DatagramSocket sock) throws IOException {
List<Resource> resources = new ArrayList<Resource>();
byte[] buf = new byte[bufsize];
DatagramPacket response = new DatagramPacket(buf, buf.length);
for (;;) {
sock.receive(response);
Object obj = ObjectPacket.deserialize(response, Object.class);
if (obj.getClass() == EndOfTransmission.class) {
break;
}
try {
resources.add((Resource) obj);
} catch (Exception e) {
throw new IOException("expected Resource; got "+obj.getClass().toString());
}
}
Resource[] arr = new Resource[0];
return resources.toArray(arr);
}
private static class EndOfTransmission implements Serializable {}
}
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