import javax.comm.*;
public class PortWatcher implements CommPortOwnershipListener {
String portName;
public PortWatcher(String portName) throws NoSuchPortException {
this.portName = portName;
CommPortIdentifier portIdentifier =
CommPortIdentifier.getPortIdentifier(portName);
portIdentifier.addPortOwnershipListener(this);
}
public void ownershipChange(int type) {
switch (type) {
case CommPortOwnershipListener.PORT_OWNED:
System.out.println(portName + " has become unavailable");
break;
case CommPortOwnershipListener.PORT_UNOWNED:
System.out.println(portName + " has become available");
break;
case CommPortOwnershipListener.PORT_OWNERSHIP_REQUESTED:
System.out.println("An application has requested onwership of "
+ portName);
break;
default:
System.out.println("Unknown port ownership event, type " + type);
}
}
public static void main(String[] args) {
try {
PortWatcher pw = new PortWatcher(args[0]);
}
catch (Exception e) {
System.err.println("Usage: java PortWatcher port_name");
}
}
}
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