The Monitor class from Guava gives us a solution that allows multiple conditions and completely eliminates the possibility of notifying all threads by switching from an explicit notification system to an implicit one. Let's take a look at an example:
public class MonitorSample {
private List<String> list = new ArrayList<String>();
private static final int MAX_SIZE = 10;
private Monitor monitor = new Monitor();
private Monitor.Guard listBelowCapacity = new Monitor.Guard(monitor) {
@Override
public boolean isSatisfied() {
return list.size() < MAX_SIZE;
}
};
public void addToList(String item) throws InterruptedException {
monitor.enterWhen(listBelowCapacity);
try {
list.add(item);
} finally {
monitor.leave();
}
}
}Let's go over the interesting parts of our example. First we are creating a new instance of a Monitor class. Next we use our newly created...