Multi-modal interaction framework - Software Development Case Studies in Java - page 513

extends UnicastRemoteObject
implements Runnable {
protected String name # "";
// this name is assigned by DProcess
protected String address # "";
// the IP address of the hosting machine
protected DProcess process;
protected Thread thread;
private boolean alive # false ;
public DActivity(DProcess process)
throws java.rmi.RemoteException {
this .process # process;
}
// this method is invoked by class DProcess
// when the activity is started
void setURL(String name, String address) {
this .name # name;
this .address # address;
}
// returns the URL of this activity
public String getURL()
{ return "//" ! address ! "/" ! name; }
// repeats the invocation of method step
public void run() {
init();
while (alive)
step();
quit();
}
// starts the thread of this activity
public void start() {
if (alive) return ;
thread # new Thread( this );
alive # true ;
thread.start();
}
// stops the thread of this activity
public void stop() {
if (! alive) return ;
alive # false ; // stops the thread
try {
if (Thread.currentThread() ! # thread)
// this activity is not stopping itself
// thus waits for thread to die
thread.join();
} catch (InterruptedException ie) { ie.printStackTrace();
}